diff --git a/tests/net/java/android/net/IpSecManagerTest.java b/tests/net/java/android/net/IpSecManagerTest.java
index 9f31d27..ccb0f3b 100644
--- a/tests/net/java/android/net/IpSecManagerTest.java
+++ b/tests/net/java/android/net/IpSecManagerTest.java
@@ -31,19 +31,21 @@
 import static org.mockito.Mockito.when;
 
 import android.support.test.filters.SmallTest;
+import android.support.test.runner.AndroidJUnit4;
 import android.system.Os;
-import android.test.AndroidTestCase;
+
 import com.android.server.IpSecService;
+
 import java.net.InetAddress;
 import java.net.UnknownHostException;
+
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
-import org.junit.runners.JUnit4;
 
 /** Unit tests for {@link IpSecManager}. */
 @SmallTest
-@RunWith(JUnit4.class)
+@RunWith(AndroidJUnit4.class)
 public class IpSecManagerTest {
 
     private static final int TEST_UDP_ENCAP_PORT = 34567;
diff --git a/tests/net/java/android/net/NetworkStatsTest.java b/tests/net/java/android/net/NetworkStatsTest.java
index eb85eb4..25289ba 100644
--- a/tests/net/java/android/net/NetworkStatsTest.java
+++ b/tests/net/java/android/net/NetworkStatsTest.java
@@ -30,23 +30,30 @@
 import static android.net.NetworkStats.IFACE_ALL;
 import static android.net.NetworkStats.TAG_NONE;
 import static android.net.NetworkStats.UID_ALL;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
 
-import android.test.suitebuilder.annotation.SmallTest;
+import android.support.test.runner.AndroidJUnit4;
+import android.support.test.filters.SmallTest;
 
 import com.google.android.collect.Sets;
 
-import junit.framework.TestCase;
-
 import java.util.HashSet;
 
+import org.junit.runner.RunWith;
+import org.junit.Test;
+
+@RunWith(AndroidJUnit4.class)
 @SmallTest
-public class NetworkStatsTest extends TestCase {
+public class NetworkStatsTest {
 
     private static final String TEST_IFACE = "test0";
     private static final String TEST_IFACE2 = "test2";
     private static final int TEST_UID = 1001;
     private static final long TEST_START = 1194220800000L;
 
+    @Test
     public void testFindIndex() throws Exception {
         final NetworkStats stats = new NetworkStats(TEST_START, 5)
                 .addValues(TEST_IFACE, 100, SET_DEFAULT, TAG_NONE, METERED_NO, ROAMING_NO, 1024L,
@@ -74,6 +81,7 @@
                 ROAMING_NO));
     }
 
+    @Test
     public void testFindIndexHinted() {
         final NetworkStats stats = new NetworkStats(TEST_START, 3)
                 .addValues(TEST_IFACE, 100, SET_DEFAULT, TAG_NONE, METERED_NO, ROAMING_NO, 1024L,
@@ -116,6 +124,7 @@
         }
     }
 
+    @Test
     public void testAddEntryGrow() throws Exception {
         final NetworkStats stats = new NetworkStats(TEST_START, 4);
 
@@ -168,6 +177,7 @@
                 ROAMING_YES, 7L, 70L, 5L, 50L, 11);
     }
 
+    @Test
     public void testCombineExisting() throws Exception {
         final NetworkStats stats = new NetworkStats(TEST_START, 10);
 
@@ -190,6 +200,7 @@
                 256L, 2L, 256L, 2L, 6);
     }
 
+    @Test
     public void testSubtractIdenticalData() throws Exception {
         final NetworkStats before = new NetworkStats(TEST_START, 2)
                 .addValues(TEST_IFACE, 100, SET_DEFAULT, TAG_NONE, 1024L, 8L, 0L, 0L, 11)
@@ -208,6 +219,7 @@
                 0L, 0L, 0L, 0);
     }
 
+    @Test
     public void testSubtractIdenticalRows() throws Exception {
         final NetworkStats before = new NetworkStats(TEST_START, 2)
                 .addValues(TEST_IFACE, 100, SET_DEFAULT, TAG_NONE, 1024L, 8L, 0L, 0L, 11)
@@ -226,6 +238,7 @@
                 1L, 4L, 1L, 8);
     }
 
+    @Test
     public void testSubtractNewRows() throws Exception {
         final NetworkStats before = new NetworkStats(TEST_START, 2)
                 .addValues(TEST_IFACE, 100, SET_DEFAULT, TAG_NONE, 1024L, 8L, 0L, 0L, 11)
@@ -247,6 +260,7 @@
                 1024L, 8L, 1024L, 8L, 20);
     }
 
+    @Test
     public void testSubtractMissingRows() throws Exception {
         final NetworkStats before = new NetworkStats(TEST_START, 2)
                 .addValues(TEST_IFACE, UID_ALL, SET_DEFAULT, TAG_NONE, 1024L, 0L, 0L, 0L, 0)
@@ -264,6 +278,7 @@
         assertEquals(4L, result.getTotalBytes());
     }
 
+    @Test
     public void testTotalBytes() throws Exception {
         final NetworkStats iface = new NetworkStats(TEST_START, 2)
                 .addValues(TEST_IFACE, UID_ALL, SET_DEFAULT, TAG_NONE, 128L, 0L, 0L, 0L, 0L)
@@ -304,6 +319,7 @@
         assertEquals(96L, uidRoaming.getTotalBytes());
     }
 
+    @Test
     public void testGroupedByIfaceEmpty() throws Exception {
         final NetworkStats uidStats = new NetworkStats(TEST_START, 3);
         final NetworkStats grouped = uidStats.groupedByIface();
@@ -312,6 +328,7 @@
         assertEquals(0, grouped.size());
     }
 
+    @Test
     public void testGroupedByIfaceAll() throws Exception {
         final NetworkStats uidStats = new NetworkStats(TEST_START, 3)
                 .addValues(IFACE_ALL, 100, SET_ALL, TAG_NONE, METERED_NO, ROAMING_NO, 128L, 8L, 0L,
@@ -329,6 +346,7 @@
                 384L, 24L, 0L, 6L, 0L);
     }
 
+    @Test
     public void testGroupedByIface() throws Exception {
         final NetworkStats uidStats = new NetworkStats(TEST_START, 7)
                 .addValues(TEST_IFACE, 100, SET_DEFAULT, TAG_NONE, METERED_NO, ROAMING_NO, 128L, 8L,
@@ -357,6 +375,7 @@
                 1024L, 64L, 0L, 0L, 0L);
     }
 
+    @Test
     public void testAddAllValues() {
         final NetworkStats first = new NetworkStats(TEST_START, 5)
                 .addValues(TEST_IFACE, 100, SET_DEFAULT, TAG_NONE, METERED_YES, ROAMING_NO, 32L, 0L,
@@ -387,6 +406,7 @@
                 32L, 0L, 0L, 0L, 0L);
     }
 
+    @Test
     public void testGetTotal() {
         final NetworkStats stats = new NetworkStats(TEST_START, 7)
                 .addValues(TEST_IFACE, 100, SET_DEFAULT, TAG_NONE, METERED_NO, ROAMING_NO, 128L, 8L,
@@ -415,6 +435,7 @@
         assertValues(stats.getTotal(null, ifaces), 1024L, 64L, 0L, 0L, 0L);
     }
 
+    @Test
     public void testWithoutUid() throws Exception {
         final NetworkStats before = new NetworkStats(TEST_START, 3)
                 .addValues(TEST_IFACE, 100, SET_DEFAULT, TAG_NONE, 128L, 8L, 0L, 2L, 20L)
@@ -433,6 +454,7 @@
                 8L, 0L, 0L, 0L);
     }
 
+    @Test
     public void testClone() throws Exception {
         final NetworkStats original = new NetworkStats(TEST_START, 5)
                 .addValues(TEST_IFACE, 100, SET_DEFAULT, TAG_NONE, 128L, 8L, 0L, 2L, 20L)
@@ -449,6 +471,7 @@
         assertEquals(128L + 512L, clone.getTotalBytes());
     }
 
+    @Test
     public void testAddWhenEmpty() throws Exception {
         final NetworkStats red = new NetworkStats(TEST_START, -1);
         final NetworkStats blue = new NetworkStats(TEST_START, 5)
@@ -459,6 +482,7 @@
         red.combineAllValues(blue);
     }
 
+    @Test
     public void testMigrateTun() throws Exception {
         final int tunUid = 10030;
         final String tunIface = "tun0";
@@ -556,6 +580,7 @@
     // interface by the vpn app before it's sent out of the underlying interface. The VPN app should
     // not be charged for the echoed data but it should still be charged for any extra data it sends
     // via the underlying interface.
+    @Test
     public void testMigrateTun_VpnAsLoopback() {
         final int tunUid = 10030;
         final String tunIface = "tun0";
diff --git a/tests/net/java/android/net/UidRangeTest.java b/tests/net/java/android/net/UidRangeTest.java
index 0a56e1b..1d1013e 100644
--- a/tests/net/java/android/net/UidRangeTest.java
+++ b/tests/net/java/android/net/UidRangeTest.java
@@ -16,14 +16,20 @@
 
 package android.net;
 
-import android.os.Parcel;
-import android.test.suitebuilder.annotation.SmallTest;
-
-import junit.framework.TestCase;
-
 import static org.junit.Assert.assertArrayEquals;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.fail;
 
-public class UidRangeTest extends TestCase {
+import android.os.Parcel;
+import android.support.test.runner.AndroidJUnit4;
+import android.support.test.filters.SmallTest;
+
+import org.junit.runner.RunWith;
+import org.junit.Test;
+
+@RunWith(AndroidJUnit4.class)
+@SmallTest
+public class UidRangeTest {
 
     static {
         System.loadLibrary("frameworksnettestsjni");
@@ -33,7 +39,7 @@
     private static native int getStart(byte[] inParcel);
     private static native int getStop(byte[] inParcel);
 
-    @SmallTest
+    @Test
     public void testNativeParcelUnparcel() {
         UidRange original = new UidRange(1234, Integer.MAX_VALUE);
 
@@ -45,7 +51,7 @@
         assertArrayEquals(inParcel, outParcel);
     }
 
-    @SmallTest
+    @Test
     public void testIndividualNativeFields() {
         UidRange original = new UidRange(0x11115678, 0x22224321);
         byte[] originalBytes = marshall(original);
@@ -54,14 +60,14 @@
         assertEquals(original.stop, getStop(originalBytes));
     }
 
-    @SmallTest
+    @Test
     public void testSingleItemUidRangeAllowed() {
         new UidRange(123, 123);
         new UidRange(0, 0);
         new UidRange(Integer.MAX_VALUE, Integer.MAX_VALUE);
     }
 
-    @SmallTest
+    @Test
     public void testNegativeUidsDisallowed() {
         try {
             new UidRange(-2, 100);
@@ -76,7 +82,7 @@
         }
     }
 
-    @SmallTest
+    @Test
     public void testStopLessThanStartDisallowed() {
         final int x = 4195000;
         try {
diff --git a/tests/net/java/android/net/apf/ApfTest.java b/tests/net/java/android/net/apf/ApfTest.java
index 5008a41..99a2ad9 100644
--- a/tests/net/java/android/net/apf/ApfTest.java
+++ b/tests/net/java/android/net/apf/ApfTest.java
@@ -16,6 +16,16 @@
 
 package android.net.apf;
 
+import static android.system.OsConstants.*;
+import static com.android.internal.util.BitUtils.bytesToBEInt;
+import static com.android.internal.util.BitUtils.put;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
+import static org.mockito.Mockito.atLeastOnce;
+import static org.mockito.Mockito.verify;
+
 import android.net.LinkAddress;
 import android.net.LinkProperties;
 import android.net.NetworkUtils;
@@ -30,23 +40,22 @@
 import android.os.ConditionVariable;
 import android.os.Parcelable;
 import android.os.SystemClock;
+import android.support.test.InstrumentationRegistry;
+import android.support.test.runner.AndroidJUnit4;
+import android.support.test.filters.SmallTest;
 import android.system.ErrnoException;
 import android.system.Os;
-import android.test.AndroidTestCase;
 import android.text.format.DateUtils;
-import android.test.suitebuilder.annotation.SmallTest;
-import static android.system.OsConstants.*;
 
 import com.android.frameworks.tests.net.R;
 import com.android.internal.util.HexDump;
-import static com.android.internal.util.BitUtils.bytesToBEInt;
-import static com.android.internal.util.BitUtils.put;
 
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
 import org.mockito.ArgumentCaptor;
 import org.mockito.Mock;
 import org.mockito.MockitoAnnotations;
-import static org.mockito.Mockito.atLeastOnce;
-import static org.mockito.Mockito.verify;
 
 import java.io.File;
 import java.io.FileDescriptor;
@@ -69,14 +78,15 @@
  * Build, install and run with:
  *  runtest frameworks-net -c android.net.apf.ApfTest
  */
-public class ApfTest extends AndroidTestCase {
+@RunWith(AndroidJUnit4.class)
+@SmallTest
+public class ApfTest {
     private static final int TIMEOUT_MS = 500;
 
     @Mock IpConnectivityLog mLog;
 
-    @Override
+    @Before
     public void setUp() throws Exception {
-        super.setUp();
         MockitoAnnotations.initMocks(this);
         // Load up native shared library containing APF interpreter exposed via JNI.
         System.loadLibrary("frameworksnettestsjni");
@@ -161,7 +171,7 @@
      * generating bytecode for that program and running it through the
      * interpreter to verify it functions correctly.
      */
-    @SmallTest
+    @Test
     public void testApfInstructions() throws IllegalInstructionException {
         // Empty program should pass because having the program counter reach the
         // location immediately after the program indicates the packet should be
@@ -569,7 +579,7 @@
      * Generate some BPF programs, translate them to APF, then run APF and BPF programs
      * over packet traces and verify both programs filter out the same packets.
      */
-    @SmallTest
+    @Test
     public void testApfAgainstBpf() throws Exception {
         String[] tcpdump_filters = new String[]{ "udp", "tcp", "icmp", "icmp6", "udp port 53",
                 "arp", "dst 239.255.255.250", "arp or tcp or udp port 53", "net 192.168.1.0/24",
@@ -739,7 +749,7 @@
     private static final byte[] ANOTHER_IPV4_ADDR        = {10, 0, 0, 2};
     private static final byte[] IPV4_ANY_HOST_ADDR       = {0, 0, 0, 0};
 
-    @SmallTest
+    @Test
     public void testApfFilterIPv4() throws Exception {
         MockIpManagerCallback ipManagerCallback = new MockIpManagerCallback();
         LinkAddress link = new LinkAddress(InetAddress.getByAddress(MOCK_IPV4_ADDR), 19);
@@ -796,7 +806,7 @@
         apfFilter.shutdown();
     }
 
-    @SmallTest
+    @Test
     public void testApfFilterIPv6() throws Exception {
         final int[] ethTypeBlackList = {};
         MockIpManagerCallback ipManagerCallback = new MockIpManagerCallback();
@@ -830,7 +840,7 @@
         apfFilter.shutdown();
     }
 
-    @SmallTest
+    @Test
     public void testApfFilterMulticast() throws Exception {
         final byte[] unicastIpv4Addr   = {(byte)192,0,2,63};
         final byte[] broadcastIpv4Addr = {(byte)192,0,2,(byte)255};
@@ -922,7 +932,7 @@
         apfFilter.shutdown();
     }
 
-    @SmallTest
+    @Test
     public void testApfFilter802_3() throws Exception {
         MockIpManagerCallback ipManagerCallback = new MockIpManagerCallback();
         LinkAddress link = new LinkAddress(InetAddress.getByAddress(MOCK_IPV4_ADDR), 19);
@@ -973,7 +983,7 @@
         apfFilter.shutdown();
     }
 
-    @SmallTest
+    @Test
     public void testApfFilterEthTypeBL() throws Exception {
         MockIpManagerCallback ipManagerCallback = new MockIpManagerCallback();
         LinkAddress link = new LinkAddress(InetAddress.getByAddress(MOCK_IPV4_ADDR), 19);
@@ -1058,7 +1068,7 @@
         assertDrop(program, garpReply());
     }
 
-    @SmallTest
+    @Test
     public void testApfFilterArp() throws Exception {
         final int[] ethTypeBlackList = {};
         MockIpManagerCallback ipManagerCallback = new MockIpManagerCallback();
@@ -1136,7 +1146,7 @@
 
     // Test that when ApfFilter is shown the given packet, it generates a program to filter it
     // for the given lifetime.
-    private void testRaLifetime(TestApfFilter apfFilter, MockIpManagerCallback ipManagerCallback,
+    private void verifyRaLifetime(TestApfFilter apfFilter, MockIpManagerCallback ipManagerCallback,
             ByteBuffer packet, int lifetime) throws IOException, ErrnoException {
         // Verify new program generated if ApfFilter witnesses RA
         ipManagerCallback.resetApfProgramWait();
@@ -1181,7 +1191,7 @@
         ipManagerCallback.assertNoProgramUpdate();
     }
 
-    @SmallTest
+    @Test
     public void testApfFilterRa() throws Exception {
         MockIpManagerCallback ipManagerCallback = new MockIpManagerCallback();
         final int[] ethTypeBlackList = {};
@@ -1212,7 +1222,7 @@
         basePacket.put(IPV6_ALL_NODES_ADDRESS);
         assertPass(program, basePacket.array());
 
-        testRaLifetime(apfFilter, ipManagerCallback, basePacket, ROUTER_LIFETIME);
+        verifyRaLifetime(apfFilter, ipManagerCallback, basePacket, ROUTER_LIFETIME);
         verifyRaEvent(new RaEvent(ROUTER_LIFETIME, -1, -1, -1, -1, -1));
 
         ByteBuffer newFlowLabelPacket = ByteBuffer.wrap(new byte[ICMP6_RA_OPTION_OFFSET]);
@@ -1247,7 +1257,8 @@
         prefixOptionPacket.putInt(
                 ICMP6_RA_OPTION_OFFSET + ICMP6_PREFIX_OPTION_VALID_LIFETIME_OFFSET,
                 PREFIX_VALID_LIFETIME);
-        testRaLifetime(apfFilter, ipManagerCallback, prefixOptionPacket, PREFIX_PREFERRED_LIFETIME);
+        verifyRaLifetime(
+                apfFilter, ipManagerCallback, prefixOptionPacket, PREFIX_PREFERRED_LIFETIME);
         verifyRaEvent(new RaEvent(
                 ROUTER_LIFETIME, PREFIX_VALID_LIFETIME, PREFIX_PREFERRED_LIFETIME, -1, -1, -1));
 
@@ -1259,7 +1270,7 @@
         rdnssOptionPacket.put((byte)(ICMP6_4_BYTE_OPTION_LEN / 8));
         rdnssOptionPacket.putInt(
                 ICMP6_RA_OPTION_OFFSET + ICMP6_4_BYTE_LIFETIME_OFFSET, RDNSS_LIFETIME);
-        testRaLifetime(apfFilter, ipManagerCallback, rdnssOptionPacket, RDNSS_LIFETIME);
+        verifyRaLifetime(apfFilter, ipManagerCallback, rdnssOptionPacket, RDNSS_LIFETIME);
         verifyRaEvent(new RaEvent(ROUTER_LIFETIME, -1, -1, -1, RDNSS_LIFETIME, -1));
 
         ByteBuffer routeInfoOptionPacket = ByteBuffer.wrap(
@@ -1270,7 +1281,7 @@
         routeInfoOptionPacket.put((byte)(ICMP6_4_BYTE_OPTION_LEN / 8));
         routeInfoOptionPacket.putInt(
                 ICMP6_RA_OPTION_OFFSET + ICMP6_4_BYTE_LIFETIME_OFFSET, ROUTE_LIFETIME);
-        testRaLifetime(apfFilter, ipManagerCallback, routeInfoOptionPacket, ROUTE_LIFETIME);
+        verifyRaLifetime(apfFilter, ipManagerCallback, routeInfoOptionPacket, ROUTE_LIFETIME);
         verifyRaEvent(new RaEvent(ROUTER_LIFETIME, -1, -1, ROUTE_LIFETIME, -1, -1));
 
         ByteBuffer dnsslOptionPacket = ByteBuffer.wrap(
@@ -1281,7 +1292,7 @@
         dnsslOptionPacket.put((byte)(ICMP6_4_BYTE_OPTION_LEN / 8));
         dnsslOptionPacket.putInt(
                 ICMP6_RA_OPTION_OFFSET + ICMP6_4_BYTE_LIFETIME_OFFSET, DNSSL_LIFETIME);
-        testRaLifetime(apfFilter, ipManagerCallback, dnsslOptionPacket, ROUTER_LIFETIME);
+        verifyRaLifetime(apfFilter, ipManagerCallback, dnsslOptionPacket, ROUTER_LIFETIME);
         verifyRaEvent(new RaEvent(ROUTER_LIFETIME, -1, -1, -1, -1, DNSSL_LIFETIME));
 
         // Verify that current program filters all five RAs:
@@ -1301,12 +1312,12 @@
      * copy that resource into the app's data directory and return the path to it.
      */
     private String stageFile(int rawId) throws Exception {
-        File file = new File(getContext().getFilesDir(), "staged_file");
+        File file = new File(InstrumentationRegistry.getContext().getFilesDir(), "staged_file");
         new File(file.getParent()).mkdirs();
         InputStream in = null;
         OutputStream out = null;
         try {
-            in = getContext().getResources().openRawResource(rawId);
+            in = InstrumentationRegistry.getContext().getResources().openRawResource(rawId);
             out = new FileOutputStream(file);
             Streams.copy(in, out);
         } finally {
@@ -1323,7 +1334,7 @@
         buffer.position(original);
     }
 
-    @SmallTest
+    @Test
     public void testRaParsing() throws Exception {
         final int maxRandomPacketSize = 512;
         final Random r = new Random();
@@ -1343,7 +1354,7 @@
         }
     }
 
-    @SmallTest
+    @Test
     public void testRaProcessing() throws Exception {
         final int maxRandomPacketSize = 512;
         final Random r = new Random();
@@ -1383,7 +1394,7 @@
     private native static boolean compareBpfApf(String filter, String pcap_filename,
             byte[] apf_program);
 
-    @SmallTest
+    @Test
     public void testBroadcastAddress() throws Exception {
         assertEqualsIp("255.255.255.255", ApfFilter.ipv4BroadcastAddress(IPV4_ANY_HOST_ADDR, 0));
         assertEqualsIp("0.0.0.0", ApfFilter.ipv4BroadcastAddress(IPV4_ANY_HOST_ADDR, 32));
diff --git a/tests/net/java/android/net/dhcp/DhcpPacketTest.java b/tests/net/java/android/net/dhcp/DhcpPacketTest.java
index d79c312..050183c 100644
--- a/tests/net/java/android/net/dhcp/DhcpPacketTest.java
+++ b/tests/net/java/android/net/dhcp/DhcpPacketTest.java
@@ -16,23 +16,36 @@
 
 package android.net.dhcp;
 
+import static android.net.dhcp.DhcpPacket.*;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
+
 import android.net.DhcpResults;
 import android.net.LinkAddress;
 import android.net.NetworkUtils;
 import android.net.metrics.DhcpErrorEvent;
+import android.support.test.runner.AndroidJUnit4;
+import android.support.test.filters.SmallTest;
 import android.system.OsConstants;
-import android.test.suitebuilder.annotation.SmallTest;
+
 import com.android.internal.util.HexDump;
+
 import java.net.Inet4Address;
 import java.nio.ByteBuffer;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Random;
-import junit.framework.TestCase;
 
-import static android.net.dhcp.DhcpPacket.*;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
 
-public class DhcpPacketTest extends TestCase {
+@RunWith(AndroidJUnit4.class)
+@SmallTest
+public class DhcpPacketTest {
 
     private static Inet4Address SERVER_ADDR = v4Address("192.0.2.1");
     private static Inet4Address CLIENT_ADDR = v4Address("192.0.2.234");
@@ -46,6 +59,7 @@
         return (Inet4Address) NetworkUtils.numericToInetAddress(addrString);
     }
 
+    @Before
     public void setUp() {
         DhcpPacket.testOverrideVendorId = "android-dhcp-???";
         DhcpPacket.testOverrideHostname = "android-01234567890abcde";
@@ -131,7 +145,7 @@
         assertEquals(expectedVendorInfo, offerPacket.mVendorInfo);
     }
 
-    @SmallTest
+    @Test
     public void testDomainName() throws Exception {
         byte[] nullByte = new byte[] { 0x00 };
         byte[] twoNullBytes = new byte[] { 0x00, 0x00 };
@@ -186,7 +200,7 @@
         assertEquals(leaseTimeMillis, offerPacket.getLeaseTimeMillis());
     }
 
-    @SmallTest
+    @Test
     public void testLeaseTime() throws Exception {
         byte[] noLease = null;
         byte[] tooShortLease = new byte[] { 0x00, 0x00 };
@@ -234,7 +248,7 @@
         }
     }
 
-    @SmallTest
+    @Test
     public void testIpAddress() throws Exception {
         byte[] slash11Netmask = new byte[] { (byte) 0xff, (byte) 0xe0, 0x00, 0x00 };
         byte[] slash24Netmask = new byte[] { (byte) 0xff, (byte) 0xff, (byte) 0xff, 0x00 };
@@ -278,11 +292,11 @@
         assertEquals(mtu, dhcpResults.mtu);
     }
 
-    @SmallTest
+    @Test
     public void testOffer1() throws Exception {
-        // TODO: Turn all of these into golden files. This will probably require modifying
-        // Android.mk appropriately, making this into an AndroidTestCase, and adding code to read
-        // the golden files from the test APK's assets via mContext.getAssets().
+        // TODO: Turn all of these into golden files. This will probably require using
+        // android.support.test.InstrumentationRegistry for obtaining a Context object
+        // to read such golden files, along with an appropriate Android.mk.
         final ByteBuffer packet = ByteBuffer.wrap(HexDump.hexStringToByteArray(
             // IP header.
             "451001480000000080118849c0a89003c0a89ff7" +
@@ -311,7 +325,7 @@
                 null, "192.168.144.3", null, 7200, false, 0, dhcpResults);
     }
 
-    @SmallTest
+    @Test
     public void testOffer2() throws Exception {
         final ByteBuffer packet = ByteBuffer.wrap(HexDump.hexStringToByteArray(
             // IP header.
@@ -343,7 +357,7 @@
         assertTrue(dhcpResults.hasMeteredHint());
     }
 
-    @SmallTest
+    @Test
     public void testBadIpPacket() throws Exception {
         final byte[] packet = HexDump.hexStringToByteArray(
             // IP header.
@@ -358,7 +372,7 @@
         fail("Dhcp packet parsing should have failed");
     }
 
-    @SmallTest
+    @Test
     public void testBadDhcpPacket() throws Exception {
         final byte[] packet = HexDump.hexStringToByteArray(
             // IP header.
@@ -377,7 +391,7 @@
         fail("Dhcp packet parsing should have failed");
     }
 
-    @SmallTest
+    @Test
     public void testBadTruncatedOffer() throws Exception {
         final byte[] packet = HexDump.hexStringToByteArray(
             // IP header.
@@ -406,7 +420,7 @@
         fail("Dhcp packet parsing should have failed");
     }
 
-    @SmallTest
+    @Test
     public void testBadOfferWithoutACookie() throws Exception {
         final byte[] packet = HexDump.hexStringToByteArray(
             // IP header.
@@ -437,7 +451,7 @@
         fail("Dhcp packet parsing should have failed");
     }
 
-    @SmallTest
+    @Test
     public void testOfferWithBadCookie() throws Exception {
         final byte[] packet = HexDump.hexStringToByteArray(
             // IP header.
@@ -473,7 +487,7 @@
         assertEquals(Integer.toHexString(expected), Integer.toHexString(got));
     }
 
-    @SmallTest
+    @Test
     public void testTruncatedOfferPackets() throws Exception {
         final byte[] packet = HexDump.hexStringToByteArray(
             // IP header.
@@ -507,7 +521,7 @@
         }
     }
 
-    @SmallTest
+    @Test
     public void testRandomPackets() throws Exception {
         final int maxRandomPacketSize = 512;
         final Random r = new Random();
@@ -547,7 +561,7 @@
                 null, "192.168.144.3", null, 7200, false, expectedMtu, dhcpResults);
     }
 
-    @SmallTest
+    @Test
     public void testMtu() throws Exception {
         final ByteBuffer packet = ByteBuffer.wrap(HexDump.hexStringToByteArray(
             // IP header.
@@ -583,7 +597,7 @@
         checkMtu(packet, 0, mtuBytes(-1));
     }
 
-    @SmallTest
+    @Test
     public void testBadHwaddrLength() throws Exception {
         final ByteBuffer packet = ByteBuffer.wrap(HexDump.hexStringToByteArray(
             // IP header.
@@ -652,7 +666,7 @@
         assertEquals(expectedClientMac, HexDump.toHexString(offerPacket.getClientMac()));
     }
 
-    @SmallTest
+    @Test
     public void testPadAndOverloadedOptionsOffer() throws Exception {
         // A packet observed in the real world that is interesting for two reasons:
         //
@@ -691,7 +705,7 @@
                 null, "1.1.1.1", null, 43200, false, 0, dhcpResults);
     }
 
-    @SmallTest
+    @Test
     public void testBug2111() throws Exception {
         final ByteBuffer packet = ByteBuffer.wrap(HexDump.hexStringToByteArray(
             // IP header.
@@ -721,7 +735,7 @@
                 "domain123.co.uk", "192.0.2.254", null, 49094, false, 0, dhcpResults);
     }
 
-    @SmallTest
+    @Test
     public void testBug2136() throws Exception {
         final ByteBuffer packet = ByteBuffer.wrap(HexDump.hexStringToByteArray(
             // Ethernet header.
@@ -754,7 +768,7 @@
                 "lancs.ac.uk", "10.32.255.128", null, 7200, false, 0, dhcpResults);
     }
 
-    @SmallTest
+    @Test
     public void testUdpServerAnySourcePort() throws Exception {
         final ByteBuffer packet = ByteBuffer.wrap(HexDump.hexStringToByteArray(
             // Ethernet header.
@@ -789,7 +803,7 @@
                 "wvm.edu", "10.1.105.252", null, 86400, false, 0, dhcpResults);
     }
 
-    @SmallTest
+    @Test
     public void testUdpInvalidDstPort() throws Exception {
         final ByteBuffer packet = ByteBuffer.wrap(HexDump.hexStringToByteArray(
             // Ethernet header.
@@ -821,7 +835,7 @@
         } catch (ParseException expected) {}
     }
 
-    @SmallTest
+    @Test
     public void testMultipleRouters() throws Exception {
         final ByteBuffer packet = ByteBuffer.wrap(HexDump.hexStringToByteArray(
             // Ethernet header.
@@ -854,7 +868,7 @@
                 null, "192.171.189.2", null, 28800, false, 0, dhcpResults);
     }
 
-    @SmallTest
+    @Test
     public void testDiscoverPacket() throws Exception {
         short secs = 7;
         int transactionId = 0xdeadbeef;
diff --git a/tests/net/java/android/net/netlink/NetlinkErrorMessageTest.java b/tests/net/java/android/net/netlink/NetlinkErrorMessageTest.java
index 5deba27..6647760 100644
--- a/tests/net/java/android/net/netlink/NetlinkErrorMessageTest.java
+++ b/tests/net/java/android/net/netlink/NetlinkErrorMessageTest.java
@@ -19,20 +19,30 @@
 import static android.net.netlink.StructNlMsgHdr.NLM_F_REQUEST;
 import static android.net.netlink.StructNlMsgHdr.NLM_F_ACK;
 import static android.net.netlink.StructNlMsgHdr.NLM_F_REPLACE;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertTrue;
 
 import android.net.netlink.NetlinkConstants;
 import android.net.netlink.NetlinkErrorMessage;
 import android.net.netlink.NetlinkMessage;
 import android.net.netlink.StructNlMsgErr;
-import android.test.suitebuilder.annotation.SmallTest;
+import android.support.test.runner.AndroidJUnit4;
+import android.support.test.filters.SmallTest;
 import android.util.Log;
+
 import java.nio.ByteBuffer;
 import java.nio.ByteOrder;
-import junit.framework.TestCase;
+
+import org.junit.runner.RunWith;
+import org.junit.Test;
+
 import libcore.util.HexEncoding;
 
 
-public class NetlinkErrorMessageTest extends TestCase {
+@RunWith(AndroidJUnit4.class)
+@SmallTest
+public class NetlinkErrorMessageTest {
     private final String TAG = "NetlinkErrorMessageTest";
 
     // Hexadecimal representation of packet capture.
@@ -54,7 +64,7 @@
     public static final byte[] NLM_ERROR_OK =
             HexEncoding.decode(NLM_ERROR_OK_HEX.toCharArray(), false);
 
-    @SmallTest
+    @Test
     public void testParseNlmErrorOk() {
         final ByteBuffer byteBuffer = ByteBuffer.wrap(NLM_ERROR_OK);
         byteBuffer.order(ByteOrder.LITTLE_ENDIAN);  // For testing.
diff --git a/tests/net/java/android/net/netlink/NetlinkSocketTest.java b/tests/net/java/android/net/netlink/NetlinkSocketTest.java
index 78b3b70..bd36bac8 100644
--- a/tests/net/java/android/net/netlink/NetlinkSocketTest.java
+++ b/tests/net/java/android/net/netlink/NetlinkSocketTest.java
@@ -16,25 +16,35 @@
 
 package android.net.netlink;
 
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertTrue;
+
 import android.net.netlink.NetlinkSocket;
 import android.net.netlink.RtNetlinkNeighborMessage;
 import android.net.netlink.StructNdMsg;
 import android.net.netlink.StructNlMsgHdr;
-import android.test.suitebuilder.annotation.SmallTest;
+import android.support.test.runner.AndroidJUnit4;
+import android.support.test.filters.SmallTest;
 import android.system.ErrnoException;
 import android.system.NetlinkSocketAddress;
 import android.system.OsConstants;
 import android.util.Log;
+
 import java.io.InterruptedIOException;
 import java.nio.ByteBuffer;
 import java.nio.ByteOrder;
-import junit.framework.TestCase;
+
+import org.junit.runner.RunWith;
+import org.junit.Test;
 
 
-public class NetlinkSocketTest extends TestCase {
+@RunWith(AndroidJUnit4.class)
+@SmallTest
+public class NetlinkSocketTest {
     private final String TAG = "NetlinkSocketTest";
 
-    @SmallTest
+    @Test
     public void testBasicWorkingGetNeighborsQuery() throws Exception {
         NetlinkSocket s = new NetlinkSocket(OsConstants.NETLINK_ROUTE);
         assertNotNull(s);
@@ -93,7 +103,7 @@
         s.close();
     }
 
-    @SmallTest
+    @Test
     public void testRepeatedCloseCallsAreQuiet() throws Exception {
         // Create a working NetlinkSocket.
         NetlinkSocket s = new NetlinkSocket(OsConstants.NETLINK_ROUTE);
diff --git a/tests/net/java/android/net/netlink/RtNetlinkNeighborMessageTest.java b/tests/net/java/android/net/netlink/RtNetlinkNeighborMessageTest.java
index 029758e..c9fd74f 100644
--- a/tests/net/java/android/net/netlink/RtNetlinkNeighborMessageTest.java
+++ b/tests/net/java/android/net/netlink/RtNetlinkNeighborMessageTest.java
@@ -16,15 +16,19 @@
 
 package android.net.netlink;
 
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertTrue;
+
 import android.net.netlink.NetlinkConstants;
 import android.net.netlink.NetlinkMessage;
 import android.net.netlink.RtNetlinkNeighborMessage;
 import android.net.netlink.StructNdMsg;
 import android.net.netlink.StructNlMsgHdr;
-import android.test.suitebuilder.annotation.SmallTest;
+import android.support.test.runner.AndroidJUnit4;
+import android.support.test.filters.SmallTest;
 import android.system.OsConstants;
 import android.util.Log;
-import libcore.util.HexEncoding;
 
 import java.net.Inet4Address;
 import java.net.InetAddress;
@@ -32,10 +36,15 @@
 import java.nio.ByteBuffer;
 import java.nio.ByteOrder;
 import java.util.Arrays;
-import junit.framework.TestCase;
 
+import org.junit.runner.RunWith;
+import org.junit.Test;
 
-public class RtNetlinkNeighborMessageTest extends TestCase {
+import libcore.util.HexEncoding;
+
+@RunWith(AndroidJUnit4.class)
+@SmallTest
+public class RtNetlinkNeighborMessageTest {
     private final String TAG = "RtNetlinkNeighborMessageTest";
 
     // Hexadecimal representation of packet capture.
@@ -136,7 +145,7 @@
     public static final byte[] RTM_GETNEIGH_RESPONSE =
             HexEncoding.decode(RTM_GETNEIGH_RESPONSE_HEX.replaceAll(" ", "").toCharArray(), false);
 
-    @SmallTest
+    @Test
     public void testParseRtmDelNeigh() {
         final ByteBuffer byteBuffer = ByteBuffer.wrap(RTM_DELNEIGH);
         byteBuffer.order(ByteOrder.LITTLE_ENDIAN);  // For testing.
@@ -163,7 +172,7 @@
         assertEquals(InetAddress.parseNumericAddress("192.168.159.254"), destination);
     }
 
-    @SmallTest
+    @Test
     public void testParseRtmNewNeigh() {
         final ByteBuffer byteBuffer = ByteBuffer.wrap(RTM_NEWNEIGH);
         byteBuffer.order(ByteOrder.LITTLE_ENDIAN);  // For testing.
@@ -190,7 +199,7 @@
         assertEquals(InetAddress.parseNumericAddress("fe80::86c9:b2ff:fe6a:ed4b"), destination);
     }
 
-    @SmallTest
+    @Test
     public void testParseRtmGetNeighResponse() {
         final ByteBuffer byteBuffer = ByteBuffer.wrap(RTM_GETNEIGH_RESPONSE);
         byteBuffer.order(ByteOrder.LITTLE_ENDIAN);  // For testing.
@@ -215,7 +224,7 @@
         assertEquals(14, messageCount);
     }
 
-    @SmallTest
+    @Test
     public void testCreateRtmNewNeighMessage() {
         final int seqNo = 2635;
         final int ifIndex = 14;
diff --git a/tests/net/java/android/net/util/BlockingSocketReaderTest.java b/tests/net/java/android/net/util/BlockingSocketReaderTest.java
index 1aad453..29dfa4c 100644
--- a/tests/net/java/android/net/util/BlockingSocketReaderTest.java
+++ b/tests/net/java/android/net/util/BlockingSocketReaderTest.java
@@ -18,15 +18,19 @@
 
 import static android.net.util.BlockingSocketReader.DEFAULT_RECV_BUF_SIZE;
 import static android.system.OsConstants.*;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
 
 import android.os.Handler;
 import android.os.HandlerThread;
+import android.support.test.filters.SmallTest;
+import android.support.test.runner.AndroidJUnit4;
 import android.system.ErrnoException;
 import android.system.Os;
 import android.system.StructTimeval;
 
-import libcore.io.IoBridge;
-
 import java.io.FileDescriptor;
 import java.io.FileInputStream;
 import java.io.IOException;
@@ -41,15 +45,21 @@
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.TimeUnit;
 
-import junit.framework.TestCase;
+import org.junit.runner.RunWith;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
 
+import libcore.io.IoBridge;
 
 /**
  * Tests for BlockingSocketReader.
  *
  * @hide
  */
-public class BlockingSocketReaderTest extends TestCase {
+@RunWith(AndroidJUnit4.class)
+@SmallTest
+public class BlockingSocketReaderTest {
     static final InetAddress LOOPBACK6 = Inet6Address.getLoopbackAddress();
     static final StructTimeval TIMEO = StructTimeval.fromMillis(500);
 
@@ -103,7 +113,7 @@
         }
     };
 
-    @Override
+    @Before
     public void setUp() {
         resetLatch();
         mLocalSocket = null;
@@ -115,7 +125,7 @@
         mHandlerThread.start();
     }
 
-    @Override
+    @After
     public void tearDown() throws Exception {
         if (mReceiver != null) {
             mHandlerThread.getThreadHandler().post(() -> { mReceiver.stop(); });
@@ -143,6 +153,7 @@
         sender.close();
     }
 
+    @Test
     public void testBasicWorking() throws Exception {
         final Handler h = mHandlerThread.getThreadHandler();
         mReceiver = new UdpLoopbackReader(h);
@@ -186,6 +197,7 @@
         public FileDescriptor createFd() { return null; }
     }
 
+    @Test
     public void testMinimalRecvBufSize() throws Exception {
         final Handler h = mHandlerThread.getThreadHandler();
 
diff --git a/tests/net/java/android/net/util/ConnectivityPacketSummaryTest.java b/tests/net/java/android/net/util/ConnectivityPacketSummaryTest.java
index dd679bc..38d3d74 100644
--- a/tests/net/java/android/net/util/ConnectivityPacketSummaryTest.java
+++ b/tests/net/java/android/net/util/ConnectivityPacketSummaryTest.java
@@ -17,18 +17,25 @@
 package android.net.util;
 
 import static android.net.util.NetworkConstants.*;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+import android.support.test.runner.AndroidJUnit4;
+import android.support.test.filters.SmallTest;
+
+import org.junit.runner.RunWith;
+import org.junit.Test;
 
 import libcore.util.HexEncoding;
 
-import junit.framework.TestCase;
-
-
 /**
  * Tests for ConnectivityPacketSummary.
  *
  * @hide
  */
-public class ConnectivityPacketSummaryTest extends TestCase {
+@RunWith(AndroidJUnit4.class)
+@SmallTest
+public class ConnectivityPacketSummaryTest {
     private static final byte[] MYHWADDR = {
         asByte(0x80), asByte(0x7a), asByte(0xbf), asByte(0x6f), asByte(0x48), asByte(0xf3)
     };
@@ -39,6 +46,7 @@
         return ConnectivityPacketSummary.summarize(MYHWADDR, bytes);
     }
 
+    @Test
     public void testParseICMPv6DADProbe() {
         final String packet =
                 // Ethernet
@@ -60,6 +68,7 @@
         assertEquals(expected, getSummary(packet));
     }
 
+    @Test
     public void testParseICMPv6RS() {
         final String packet =
                 // Ethernet
@@ -81,6 +90,7 @@
         assertEquals(expected, getSummary(packet));
     }
 
+    @Test
     public void testParseICMPv6RA() {
         final String packet =
                 // Ethernet
@@ -113,6 +123,7 @@
         assertEquals(expected, getSummary(packet));
     }
 
+    @Test
     public void testParseICMPv6NS() {
         final String packet =
                 // Ethernet
@@ -135,6 +146,7 @@
         assertEquals(expected, getSummary(packet));
     }
 
+    @Test
     public void testInvalidICMPv6NDLength() {
         final String packet =
                 // Ethernet
@@ -159,6 +171,7 @@
         assertEquals(expected, getSummary(packet));
     }
 
+    @Test
     public void testParseICMPv6NA() {
         final String packet =
                 // Ethernet
@@ -179,6 +192,7 @@
         assertEquals(expected, getSummary(packet));
     }
 
+    @Test
     public void testParseARPRequest() {
         final String packet =
                 // Ethernet
@@ -197,6 +211,7 @@
         assertEquals(expected, getSummary(packet));
     }
 
+    @Test
     public void testParseARPReply() {
         final String packet =
                 // Ethernet
@@ -217,6 +232,7 @@
         assertEquals(expected, getSummary(packet));
     }
 
+    @Test
     public void testParseDHCPv4Discover() {
         final String packet =
                 // Ethernet
@@ -262,6 +278,7 @@
         assertTrue(getSummary(packet).startsWith(expectedPrefix));
     }
 
+    @Test
     public void testParseDHCPv4Offer() {
         final String packet =
                 // Ethernet
@@ -307,6 +324,7 @@
         assertTrue(getSummary(packet).startsWith(expectedPrefix));
     }
 
+    @Test
     public void testParseDHCPv4Request() {
         final String packet =
                 // Ethernet
@@ -354,6 +372,7 @@
         assertTrue(getSummary(packet).startsWith(expectedPrefix));
     }
 
+    @Test
     public void testParseDHCPv4Ack() {
         final String packet =
                 // Ethernet
diff --git a/tests/net/java/android/net/util/IpUtilsTest.java b/tests/net/java/android/net/util/IpUtilsTest.java
index c2d1608..8903bf9 100644
--- a/tests/net/java/android/net/util/IpUtilsTest.java
+++ b/tests/net/java/android/net/util/IpUtilsTest.java
@@ -16,15 +16,19 @@
 
 package android.net.util;
 
-import android.net.util.IpUtils;
-import android.test.suitebuilder.annotation.SmallTest;
+import static org.junit.Assert.assertEquals;
+
+import android.support.test.runner.AndroidJUnit4;
+import android.support.test.filters.SmallTest;
 
 import java.nio.ByteBuffer;
 
-import junit.framework.TestCase;
+import org.junit.runner.RunWith;
+import org.junit.Test;
 
-
-public class IpUtilsTest extends TestCase {
+@RunWith(AndroidJUnit4.class)
+@SmallTest
+public class IpUtilsTest {
 
     private static final int IPV4_HEADER_LENGTH = 20;
     private static final int IPV6_HEADER_LENGTH = 40;
@@ -67,7 +71,7 @@
     //           "hello")
     // print JavaPacketDefinition(str(packet))
 
-    @SmallTest
+    @Test
     public void testIpv6TcpChecksum() throws Exception {
         // packet = (scapy.IPv6(src="2001:db8::1", dst="2001:db8::2", tc=0x80) /
         //           scapy.TCP(sport=12345, dport=7,
@@ -115,7 +119,7 @@
         assertEquals(0, IpUtils.tcpChecksum(packet, 0, IPV6_HEADER_LENGTH, transportLen));
     }
 
-    @SmallTest
+    @Test
     public void testIpv4UdpChecksum() {
         // packet = (scapy.IP(src="192.0.2.1", dst="192.0.2.2", tos=0x40) /
         //           scapy.UDP(sport=32012, dport=4500) /
diff --git a/tests/net/java/com/android/internal/net/NetworkStatsFactoryTest.java b/tests/net/java/com/android/internal/net/NetworkStatsFactoryTest.java
index a423c2a..fb2bd79 100644
--- a/tests/net/java/com/android/internal/net/NetworkStatsFactoryTest.java
+++ b/tests/net/java/com/android/internal/net/NetworkStatsFactoryTest.java
@@ -24,12 +24,15 @@
 import static android.net.NetworkStats.TAG_NONE;
 import static android.net.NetworkStats.UID_ALL;
 import static com.android.server.NetworkManagementSocketTagger.kernelToTag;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.fail;
 
 import android.content.res.Resources;
 import android.net.NetworkStats;
 import android.net.TrafficStats;
+import android.support.test.InstrumentationRegistry;
 import android.support.test.filters.SmallTest;
-import android.test.AndroidTestCase;
+import android.support.test.runner.AndroidJUnit4;
 
 import com.android.frameworks.tests.net.R;
 
@@ -42,19 +45,23 @@
 import libcore.io.IoUtils;
 import libcore.io.Streams;
 
+import org.junit.runner.RunWith;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
 /**
  * Tests for {@link NetworkStatsFactory}.
  */
+@RunWith(AndroidJUnit4.class)
 @SmallTest
-public class NetworkStatsFactoryTest extends AndroidTestCase {
+public class NetworkStatsFactoryTest {
     private File mTestProc;
     private NetworkStatsFactory mFactory;
 
-    @Override
+    @Before
     public void setUp() throws Exception {
-        super.setUp();
-
-        mTestProc = new File(getContext().getFilesDir(), "proc");
+        mTestProc = new File(InstrumentationRegistry.getContext().getFilesDir(), "proc");
         if (mTestProc.exists()) {
             IoUtils.deleteContents(mTestProc);
         }
@@ -62,17 +69,16 @@
         mFactory = new NetworkStatsFactory(mTestProc);
     }
 
-    @Override
+    @After
     public void tearDown() throws Exception {
         mFactory = null;
 
         if (mTestProc.exists()) {
             IoUtils.deleteContents(mTestProc);
         }
-
-        super.tearDown();
     }
 
+    @Test
     public void testNetworkStatsDetail() throws Exception {
         final NetworkStats stats = parseDetailedStats(R.raw.xt_qtaguid_typical);
 
@@ -84,6 +90,7 @@
         assertStatsEntry(stats, "rmnet2", 10001, SET_DEFAULT, 0x0, 1125899906842624L, 984L);
     }
 
+    @Test
     public void testKernelTags() throws Exception {
         assertEquals(0, kernelToTag("0x0000000000000000"));
         assertEquals(0x32, kernelToTag("0x0000003200000000"));
@@ -98,6 +105,7 @@
         assertEquals(TrafficStats.TAG_SYSTEM_DOWNLOAD, kernelToTag("0xffffff0100000000"));
     }
 
+    @Test
     public void testNetworkStatsWithSet() throws Exception {
         final NetworkStats stats = parseDetailedStats(R.raw.xt_qtaguid_typical);
         assertEquals(70, stats.size());
@@ -106,6 +114,7 @@
         assertStatsEntry(stats, "rmnet1", 10021, SET_FOREGROUND, 0x30100000, 742L, 3L, 1265L, 3L);
     }
 
+    @Test
     public void testNetworkStatsSingle() throws Exception {
         stageFile(R.raw.xt_qtaguid_iface_typical, file("net/xt_qtaguid/iface_stat_all"));
 
@@ -116,6 +125,7 @@
         assertStatsEntry(stats, "test2", UID_ALL, SET_ALL, TAG_NONE, 1L, 2L, 3L, 4L);
     }
 
+    @Test
     public void testNetworkStatsXt() throws Exception {
         stageFile(R.raw.xt_qtaguid_iface_fmt_typical, file("net/xt_qtaguid/iface_stat_fmt"));
 
@@ -127,6 +137,7 @@
         assertStatsEntry(stats, "rmnet2", UID_ALL, SET_ALL, TAG_NONE, 4968L, 35L, 3081L, 39L);
     }
 
+    @Test
     public void testDoubleClatAccounting() throws Exception {
         NetworkStatsFactory.noteStackedIface("v4-wlan0", "wlan0");
 
@@ -161,6 +172,7 @@
         NetworkStatsFactory.noteStackedIface("v4-wlan0", null);
     }
 
+    @Test
     public void testDoubleClatAccounting100MBDownload() throws Exception {
         // Downloading 100mb from an ipv4 only destination in a foreground activity
 
@@ -197,7 +209,7 @@
         InputStream in = null;
         OutputStream out = null;
         try {
-            in = getContext().getResources().openRawResource(rawId);
+            in = InstrumentationRegistry.getContext().getResources().openRawResource(rawId);
             out = new FileOutputStream(file);
             Streams.copy(in, out);
         } finally {
@@ -251,5 +263,4 @@
         assertEquals("unexpected txBytes", txBytes, entry.txBytes);
         assertEquals("unexpected txPackets", txPackets, entry.txPackets);
     }
-
 }
diff --git a/tests/net/java/com/android/server/ConnectivityServiceTest.java b/tests/net/java/com/android/server/ConnectivityServiceTest.java
index 335e6240..d9586c2 100644
--- a/tests/net/java/com/android/server/ConnectivityServiceTest.java
+++ b/tests/net/java/com/android/server/ConnectivityServiceTest.java
@@ -26,8 +26,13 @@
 import static android.net.ConnectivityManager.getNetworkTypeName;
 import static android.net.NetworkCapabilities.*;
 
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.fail;
 import static com.android.internal.util.TestUtils.waitForIdleHandler;
-
 import static org.mockito.Mockito.anyBoolean;
 import static org.mockito.Mockito.anyInt;
 import static org.mockito.Mockito.eq;
@@ -87,9 +92,10 @@
 import android.os.SystemClock;
 import android.os.UserHandle;
 import android.provider.Settings;
-import android.test.AndroidTestCase;
+import android.support.test.InstrumentationRegistry;
+import android.support.test.filters.SmallTest;
+import android.support.test.runner.AndroidJUnit4;
 import android.test.mock.MockContentResolver;
-import android.test.suitebuilder.annotation.SmallTest;
 import android.text.TextUtils;
 import android.util.ArraySet;
 import android.util.Log;
@@ -105,7 +111,11 @@
 import com.android.server.net.NetworkPinner;
 import com.android.server.net.NetworkPolicyManagerInternal;
 
+import org.junit.After;
+import org.junit.Before;
 import org.junit.Ignore;
+import org.junit.Test;
+import org.junit.runner.RunWith;
 import org.mockito.Mock;
 import org.mockito.MockitoAnnotations;
 import org.mockito.Spy;
@@ -123,13 +133,16 @@
 import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.function.Predicate;
 
+
 /**
  * Tests for {@link ConnectivityService}.
  *
  * Build, install and run with:
  *  runtest frameworks-net -c com.android.server.ConnectivityServiceTest
  */
-public class ConnectivityServiceTest extends AndroidTestCase {
+@RunWith(AndroidJUnit4.class)
+@SmallTest
+public class ConnectivityServiceTest {
     private static final String TAG = "ConnectivityServiceTest";
 
     private static final int TIMEOUT_MS = 500;
@@ -141,6 +154,7 @@
     private MockNetworkAgent mWiFiNetworkAgent;
     private MockNetworkAgent mCellNetworkAgent;
     private MockNetworkAgent mEthernetNetworkAgent;
+    private Context mContext;
 
     // This class exists to test bindProcessToNetwork and getBoundNetworkForProcess. These methods
     // do not go through ConnectivityService but talk to netd directly, so they don't automatically
@@ -242,7 +256,7 @@
         waitForIdle(TIMEOUT_MS);
     }
 
-    @SmallTest
+    @Test
     public void testWaitForIdle() {
         final int attempts = 50;  // Causes the test to take about 200ms on bullhead-eng.
 
@@ -743,7 +757,8 @@
 
                 // Don't overlap test NetIDs with real NetIDs as binding sockets to real networks
                 // can have odd side-effects, like network validations succeeding.
-                final Network[] networks = ConnectivityManager.from(getContext()).getAllNetworks();
+                Context context = InstrumentationRegistry.getContext();
+                final Network[] networks = ConnectivityManager.from(context).getAllNetworks();
                 boolean overlaps = false;
                 for (Network network : networks) {
                     if (netId == network.netId) {
@@ -814,9 +829,9 @@
         fail("ConditionVariable was blocked for more than " + TIMEOUT_MS + "ms");
     }
 
-    @Override
+    @Before
     public void setUp() throws Exception {
-        super.setUp();
+        mContext = InstrumentationRegistry.getContext();
 
         // InstrumentationTestRunner prepares a looper, but AndroidJUnitRunner does not.
         // http://b/25897652 .
@@ -824,7 +839,7 @@
             Looper.prepare();
         }
 
-        mServiceContext = new MockContext(getContext());
+        mServiceContext = new MockContext(InstrumentationRegistry.getContext());
         LocalServices.removeServiceForTest(NetworkPolicyManagerInternal.class);
         LocalServices.addService(
                 NetworkPolicyManagerInternal.class, mock(NetworkPolicyManagerInternal.class));
@@ -835,7 +850,7 @@
                 mock(IpConnectivityLog.class));
 
         mService.systemReady();
-        mCm = new WrappedConnectivityManager(getContext(), mService);
+        mCm = new WrappedConnectivityManager(InstrumentationRegistry.getContext(), mService);
         mCm.bindProcessToNetwork(null);
 
         // Ensure that the default setting for Captive Portals is used for most tests
@@ -843,6 +858,7 @@
         setMobileDataAlwaysOn(false);
     }
 
+    @After
     public void tearDown() throws Exception {
         setMobileDataAlwaysOn(false);
         if (mCellNetworkAgent != null) {
@@ -857,7 +873,6 @@
             mEthernetNetworkAgent.disconnect();
             mEthernetNetworkAgent = null;
         }
-        super.tearDown();
     }
 
     private static int transportToLegacyType(int transport) {
@@ -931,6 +946,7 @@
         return cv;
     }
 
+    @Test
     public void testNetworkTypes() {
         // Ensure that our mocks for the networkAttributes config variable work as expected. If they
         // don't, then tests that depend on CONNECTIVITY_ACTION broadcasts for these network types
@@ -946,7 +962,7 @@
         assertTrue(mCm.isNetworkSupported(TYPE_ETHERNET));
     }
 
-    @SmallTest
+    @Test
     public void testLingering() throws Exception {
         verifyNoNetwork();
         mCellNetworkAgent = new MockNetworkAgent(TRANSPORT_CELLULAR);
@@ -987,7 +1003,7 @@
         verifyNoNetwork();
     }
 
-    @SmallTest
+    @Test
     public void testValidatedCellularOutscoresUnvalidatedWiFi() throws Exception {
         // Test bringing up unvalidated WiFi
         mWiFiNetworkAgent = new MockNetworkAgent(TRANSPORT_WIFI);
@@ -1022,7 +1038,7 @@
         verifyNoNetwork();
     }
 
-    @SmallTest
+    @Test
     public void testUnvalidatedWifiOutscoresUnvalidatedCellular() throws Exception {
         // Test bringing up unvalidated cellular.
         mCellNetworkAgent = new MockNetworkAgent(TRANSPORT_CELLULAR);
@@ -1048,7 +1064,7 @@
         verifyNoNetwork();
     }
 
-    @SmallTest
+    @Test
     public void testUnlingeringDoesNotValidate() throws Exception {
         // Test bringing up unvalidated WiFi.
         mWiFiNetworkAgent = new MockNetworkAgent(TRANSPORT_WIFI);
@@ -1076,7 +1092,7 @@
                 NET_CAPABILITY_VALIDATED));
     }
 
-    @SmallTest
+    @Test
     public void testCellularOutscoresWeakWifi() throws Exception {
         // Test bringing up validated cellular.
         mCellNetworkAgent = new MockNetworkAgent(TRANSPORT_CELLULAR);
@@ -1102,7 +1118,7 @@
         verifyActiveNetwork(TRANSPORT_WIFI);
     }
 
-    @SmallTest
+    @Test
     public void testReapingNetwork() throws Exception {
         // Test bringing up WiFi without NET_CAPABILITY_INTERNET.
         // Expect it to be torn down immediately because it satisfies no requests.
@@ -1135,7 +1151,7 @@
         waitFor(cv);
     }
 
-    @SmallTest
+    @Test
     public void testCellularFallback() throws Exception {
         // Test bringing up validated cellular.
         mCellNetworkAgent = new MockNetworkAgent(TRANSPORT_CELLULAR);
@@ -1173,7 +1189,7 @@
         verifyActiveNetwork(TRANSPORT_WIFI);
     }
 
-    @SmallTest
+    @Test
     public void testWiFiFallback() throws Exception {
         // Test bringing up unvalidated WiFi.
         mWiFiNetworkAgent = new MockNetworkAgent(TRANSPORT_WIFI);
@@ -1387,7 +1403,7 @@
         }
     }
 
-    @SmallTest
+    @Test
     public void testStateChangeNetworkCallbacks() throws Exception {
         final TestNetworkCallback genericNetworkCallback = new TestNetworkCallback();
         final TestNetworkCallback wifiNetworkCallback = new TestNetworkCallback();
@@ -1477,7 +1493,7 @@
         assertNoCallbacks(genericNetworkCallback, wifiNetworkCallback, cellNetworkCallback);
     }
 
-    @SmallTest
+    @Test
     public void testMultipleLingering() {
         NetworkRequest request = new NetworkRequest.Builder()
                 .clearCapabilities().addCapability(NET_CAPABILITY_NOT_METERED)
@@ -1705,7 +1721,7 @@
         mCm.unregisterNetworkCallback(trackDefaultCallback);
     }
 
-    @SmallTest
+    @Test
     public void testExplicitlySelected() {
         NetworkRequest request = new NetworkRequest.Builder()
                 .clearCapabilities().addCapability(NET_CAPABILITY_INTERNET)
@@ -1872,7 +1888,7 @@
         handlerThread.quit();
     }
 
-    @SmallTest
+    @Test
     public void testNetworkFactoryRequests() throws Exception {
         tryNetworkFactoryRequests(NET_CAPABILITY_MMS);
         tryNetworkFactoryRequests(NET_CAPABILITY_SUPL);
@@ -1892,7 +1908,7 @@
         // Skipping VALIDATED and CAPTIVE_PORTAL as they're disallowed.
     }
 
-    @SmallTest
+    @Test
     public void testNoMutableNetworkRequests() throws Exception {
         PendingIntent pendingIntent = PendingIntent.getBroadcast(mContext, 0, new Intent("a"), 0);
         NetworkRequest request1 = new NetworkRequest.Builder()
@@ -1909,7 +1925,7 @@
         assertException(() -> { mCm.requestNetwork(request2, pendingIntent); }, expected);
     }
 
-    @SmallTest
+    @Test
     public void testMMSonWiFi() throws Exception {
         // Test bringing up cellular without MMS NetworkRequest gets reaped
         mCellNetworkAgent = new MockNetworkAgent(TRANSPORT_CELLULAR);
@@ -1948,7 +1964,7 @@
         verifyActiveNetwork(TRANSPORT_WIFI);
     }
 
-    @SmallTest
+    @Test
     public void testMMSonCell() throws Exception {
         // Test bringing up cellular without MMS
         mCellNetworkAgent = new MockNetworkAgent(TRANSPORT_CELLULAR);
@@ -1977,7 +1993,7 @@
         verifyActiveNetwork(TRANSPORT_CELLULAR);
     }
 
-    @SmallTest
+    @Test
     public void testCaptivePortal() {
         final TestNetworkCallback captivePortalCallback = new TestNetworkCallback();
         final NetworkRequest captivePortalRequest = new NetworkRequest.Builder()
@@ -2028,7 +2044,7 @@
         validatedCallback.expectCallback(CallbackState.LOST, mWiFiNetworkAgent);
     }
 
-    @SmallTest
+    @Test
     public void testCaptivePortalApp() {
         final TestNetworkCallback captivePortalCallback = new TestNetworkCallback();
         final NetworkRequest captivePortalRequest = new NetworkRequest.Builder()
@@ -2074,7 +2090,7 @@
         mCm.unregisterNetworkCallback(captivePortalCallback);
     }
 
-    @SmallTest
+    @Test
     public void testAvoidOrIgnoreCaptivePortals() {
         final TestNetworkCallback captivePortalCallback = new TestNetworkCallback();
         final NetworkRequest captivePortalRequest = new NetworkRequest.Builder()
@@ -2119,7 +2135,7 @@
         return new NetworkRequest.Builder().addTransportType(TRANSPORT_WIFI);
     }
 
-    @SmallTest
+    @Test
     public void testNetworkSpecifier() {
         NetworkRequest rEmpty1 = newWifiRequestBuilder().build();
         NetworkRequest rEmpty2 = newWifiRequestBuilder().setNetworkSpecifier((String) null).build();
@@ -2180,7 +2196,7 @@
         assertNoCallbacks(cEmpty1, cEmpty2, cEmpty3, cFoo, cBar);
     }
 
-    @SmallTest
+    @Test
     public void testInvalidNetworkSpecifier() {
         try {
             NetworkRequest.Builder builder = new NetworkRequest.Builder();
@@ -2241,7 +2257,7 @@
         }
     }
 
-    @SmallTest
+    @Test
     public void testNetworkSpecifierUidSpoofSecurityException() {
         class UidAwareNetworkSpecifier extends NetworkSpecifier implements Parcelable {
             @Override
@@ -2275,7 +2291,7 @@
         }
     }
 
-    @SmallTest
+    @Test
     public void testRegisterDefaultNetworkCallback() throws Exception {
         final TestNetworkCallback defaultNetworkCallback = new TestNetworkCallback();
         mCm.registerDefaultNetworkCallback(defaultNetworkCallback);
@@ -2324,7 +2340,7 @@
         defaultNetworkCallback.expectCallback(CallbackState.LOST, mCellNetworkAgent);
     }
 
-    @SmallTest
+    @Test
     public void testAdditionalStateCallbacks() throws Exception {
         // File a network request for mobile.
         final TestNetworkCallback cellNetworkCallback = new TestNetworkCallback();
@@ -2385,7 +2401,7 @@
         return nc.hasCapability(NET_CAPABILITY_FOREGROUND);
     }
 
-    @SmallTest
+    @Test
     public void testBackgroundNetworks() throws Exception {
         // Create a background request. We can't do this ourselves because ConnectivityService
         // doesn't have an API for it. So just turn on mobile data always on.
@@ -2554,7 +2570,7 @@
         return false;
     }
 
-    @SmallTest
+    @Test
     public void testMobileDataAlwaysOn() throws Exception {
         final TestNetworkCallback cellNetworkCallback = new TestNetworkCallback();
         final NetworkRequest cellRequest = new NetworkRequest.Builder()
@@ -2619,7 +2635,7 @@
         handlerThread.quit();
     }
 
-    @SmallTest
+    @Test
     public void testAvoidBadWifiSetting() throws Exception {
         final ContentResolver cr = mServiceContext.getContentResolver();
         final WrappedMultinetworkPolicyTracker tracker = mService.getMultinetworkPolicyTracker();
@@ -2657,7 +2673,7 @@
         assertTrue(tracker.shouldNotifyWifiUnvalidated());
     }
 
-    @SmallTest
+    @Test
     public void testAvoidBadWifi() throws Exception {
         final ContentResolver cr = mServiceContext.getContentResolver();
         final WrappedMultinetworkPolicyTracker tracker = mService.getMultinetworkPolicyTracker();
@@ -2784,7 +2800,7 @@
         mCm.unregisterNetworkCallback(defaultCallback);
     }
 
-    @SmallTest
+    @Test
     public void testMeteredMultipathPreferenceSetting() throws Exception {
         final ContentResolver cr = mServiceContext.getContentResolver();
         final WrappedMultinetworkPolicyTracker tracker = mService.getMultinetworkPolicyTracker();
@@ -2808,7 +2824,7 @@
      * Validate that a satisfied network request does not trigger onUnavailable() once the
      * time-out period expires.
      */
-    @SmallTest
+    @Test
     public void testSatisfiedNetworkRequestDoesNotTriggerOnUnavailable() {
         NetworkRequest nr = new NetworkRequest.Builder().addTransportType(
                 NetworkCapabilities.TRANSPORT_WIFI).build();
@@ -2828,7 +2844,7 @@
      * Validate that a satisfied network request followed by a disconnected (lost) network does
      * not trigger onUnavailable() once the time-out period expires.
      */
-    @SmallTest
+    @Test
     public void testSatisfiedThenLostNetworkRequestDoesNotTriggerOnUnavailable() {
         NetworkRequest nr = new NetworkRequest.Builder().addTransportType(
                 NetworkCapabilities.TRANSPORT_WIFI).build();
@@ -2852,7 +2868,7 @@
      * callback is called when time-out expires. Then validate that if network request is
      * (somehow) satisfied - the callback isn't called later.
      */
-    @SmallTest
+    @Test
     public void testTimedoutNetworkRequest() {
         NetworkRequest nr = new NetworkRequest.Builder().addTransportType(
                 NetworkCapabilities.TRANSPORT_WIFI).build();
@@ -2873,7 +2889,7 @@
      * Validate that when a network request is unregistered (cancelled), no posterior event can
      * trigger the callback.
      */
-    @SmallTest
+    @Test
     public void testNoCallbackAfterUnregisteredNetworkRequest() {
         NetworkRequest nr = new NetworkRequest.Builder().addTransportType(
                 NetworkCapabilities.TRANSPORT_WIFI).build();
@@ -2981,7 +2997,7 @@
         return mWiFiNetworkAgent.getNetwork();
     }
 
-    @SmallTest
+    @Test
     public void testPacketKeepalives() throws Exception {
         InetAddress myIPv4 = InetAddress.getByName("192.0.2.129");
         InetAddress notMyIPv4 = InetAddress.getByName("192.0.2.35");
@@ -3105,7 +3121,7 @@
         callback3.expectStopped();
     }
 
-    @SmallTest
+    @Test
     public void testGetCaptivePortalServerUrl() throws Exception {
         String url = mCm.getCaptivePortalServerUrl();
         assertEquals("http://connectivitycheck.gstatic.com/generate_204", url);
@@ -3150,7 +3166,7 @@
         assertEquals(mCellNetworkAgent.getNetwork(), mCm.getActiveNetwork());
     }
 
-    @SmallTest
+    @Test
     public void testNetworkPinner() {
         NetworkRequest wifiRequest = new NetworkRequest.Builder()
                 .addTransportType(TRANSPORT_WIFI)
@@ -3210,7 +3226,7 @@
         assertPinnedToWifiWithCellDefault();
     }
 
-    @SmallTest
+    @Test
     public void testNetworkCallbackMaximum() {
         final int MAX_REQUESTS = 100;
         final int CALLBACKS = 90;
@@ -3302,7 +3318,7 @@
         }
     }
 
-    @SmallTest
+    @Test
     public void testNetworkInfoOfTypeNone() {
         ConditionVariable broadcastCV = waitForConnectivityBroadcasts(1);
 
@@ -3342,7 +3358,7 @@
         }
     }
 
-    @SmallTest
+    @Test
     public void testDeprecatedAndUnsupportedOperations() throws Exception {
         final int TYPE_NONE = ConnectivityManager.TYPE_NONE;
         assertNull(mCm.getNetworkInfo(TYPE_NONE));
@@ -3363,7 +3379,7 @@
         assertException(() -> { mCm.requestRouteToHostAddress(TYPE_NONE, null); }, unsupported);
     }
 
-    @SmallTest
+    @Test
     public void testLinkPropertiesEnsuresDirectlyConnectedRoutes() {
         final NetworkRequest networkRequest = new NetworkRequest.Builder()
                 .addTransportType(TRANSPORT_WIFI).build();
diff --git a/tests/net/java/com/android/server/IpSecServiceTest.java b/tests/net/java/com/android/server/IpSecServiceTest.java
index efc58cc..83ee361 100644
--- a/tests/net/java/com/android/server/IpSecServiceTest.java
+++ b/tests/net/java/com/android/server/IpSecServiceTest.java
@@ -36,6 +36,7 @@
 import android.os.Binder;
 import android.os.ParcelFileDescriptor;
 import android.support.test.filters.SmallTest;
+import android.support.test.runner.AndroidJUnit4;
 import android.system.ErrnoException;
 import android.system.Os;
 
@@ -48,11 +49,10 @@
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
-import org.junit.runners.JUnit4;
 
 /** Unit tests for {@link IpSecService}. */
 @SmallTest
-@RunWith(JUnit4.class)
+@RunWith(AndroidJUnit4.class)
 public class IpSecServiceTest {
 
     private static final int DROID_SPI = 0xD1201D;
diff --git a/tests/net/java/com/android/server/connectivity/LingerMonitorTest.java b/tests/net/java/com/android/server/connectivity/LingerMonitorTest.java
index 77956be..354cf2f 100644
--- a/tests/net/java/com/android/server/connectivity/LingerMonitorTest.java
+++ b/tests/net/java/com/android/server/connectivity/LingerMonitorTest.java
@@ -16,24 +16,8 @@
 
 package com.android.server.connectivity;
 
-import android.app.PendingIntent;
-import android.content.Context;
-import android.content.res.Resources;
-import android.net.ConnectivityManager;
-import android.net.Network;
-import android.net.NetworkCapabilities;
-import android.net.NetworkInfo;
-import android.net.NetworkMisc;
-import android.test.suitebuilder.annotation.SmallTest;
-import android.text.format.DateUtils;
-import com.android.internal.R;
-import com.android.server.ConnectivityService;
-import com.android.server.connectivity.NetworkNotificationManager;
-import com.android.server.connectivity.NetworkNotificationManager.NotificationType;
-import junit.framework.TestCase;
-import org.mockito.Mock;
-import org.mockito.MockitoAnnotations;
-
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
 import static org.mockito.Mockito.any;
 import static org.mockito.Mockito.anyBoolean;
 import static org.mockito.Mockito.anyInt;
@@ -44,7 +28,32 @@
 import static org.mockito.Mockito.when;
 import static org.mockito.Mockito.reset;
 
-public class LingerMonitorTest extends TestCase {
+import android.app.PendingIntent;
+import android.content.Context;
+import android.content.res.Resources;
+import android.net.ConnectivityManager;
+import android.net.Network;
+import android.net.NetworkCapabilities;
+import android.net.NetworkInfo;
+import android.net.NetworkMisc;
+import android.support.test.runner.AndroidJUnit4;
+import android.support.test.filters.SmallTest;
+import android.text.format.DateUtils;
+
+import com.android.internal.R;
+import com.android.server.ConnectivityService;
+import com.android.server.connectivity.NetworkNotificationManager;
+import com.android.server.connectivity.NetworkNotificationManager.NotificationType;
+
+import org.junit.runner.RunWith;
+import org.junit.Before;
+import org.junit.Test;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+
+@RunWith(AndroidJUnit4.class)
+@SmallTest
+public class LingerMonitorTest {
     static final String CELLULAR = "CELLULAR";
     static final String WIFI     = "WIFI";
 
@@ -62,6 +71,7 @@
     @Mock NetworkNotificationManager mNotifier;
     @Mock Resources mResources;
 
+    @Before
     public void setUp() {
         MockitoAnnotations.initMocks(this);
         when(mCtx.getResources()).thenReturn(mResources);
@@ -71,7 +81,7 @@
         mMonitor = new TestableLingerMonitor(mCtx, mNotifier, HIGH_DAILY_LIMIT, HIGH_RATE_LIMIT);
     }
 
-    @SmallTest
+    @Test
     public void testTransitions() {
         setNotificationSwitch(transition(WIFI, CELLULAR));
         NetworkAgentInfo nai1 = wifiNai(100);
@@ -81,7 +91,7 @@
         assertFalse(mMonitor.isNotificationEnabled(nai2, nai1));
     }
 
-    @SmallTest
+    @Test
     public void testNotificationOnLinger() {
         setNotificationSwitch(transition(WIFI, CELLULAR));
         setNotificationType(LingerMonitor.NOTIFY_TYPE_NOTIFICATION);
@@ -92,7 +102,7 @@
         verifyNotification(from, to);
     }
 
-    @SmallTest
+    @Test
     public void testToastOnLinger() {
         setNotificationSwitch(transition(WIFI, CELLULAR));
         setNotificationType(LingerMonitor.NOTIFY_TYPE_TOAST);
@@ -103,7 +113,7 @@
         verifyToast(from, to);
     }
 
-    @SmallTest
+    @Test
     public void testNotificationClearedAfterDisconnect() {
         setNotificationSwitch(transition(WIFI, CELLULAR));
         setNotificationType(LingerMonitor.NOTIFY_TYPE_NOTIFICATION);
@@ -117,7 +127,7 @@
         verify(mNotifier, times(1)).clearNotification(100);
     }
 
-    @SmallTest
+    @Test
     public void testNotificationClearedAfterSwitchingBack() {
         setNotificationSwitch(transition(WIFI, CELLULAR));
         setNotificationType(LingerMonitor.NOTIFY_TYPE_NOTIFICATION);
@@ -131,7 +141,7 @@
         verify(mNotifier, times(1)).clearNotification(100);
     }
 
-    @SmallTest
+    @Test
     public void testUniqueToast() {
         setNotificationSwitch(transition(WIFI, CELLULAR));
         setNotificationType(LingerMonitor.NOTIFY_TYPE_TOAST);
@@ -149,7 +159,7 @@
         verifyNoNotifications();
     }
 
-    @SmallTest
+    @Test
     public void testMultipleNotifications() {
         setNotificationSwitch(transition(WIFI, CELLULAR));
         setNotificationType(LingerMonitor.NOTIFY_TYPE_NOTIFICATION);
@@ -168,7 +178,7 @@
         verifyNotification(wifi2, cell);
     }
 
-    @SmallTest
+    @Test
     public void testRateLimiting() throws InterruptedException {
         mMonitor = new TestableLingerMonitor(mCtx, mNotifier, HIGH_DAILY_LIMIT, LOW_RATE_LIMIT);
 
@@ -194,7 +204,7 @@
         verifyNoNotifications();
     }
 
-    @SmallTest
+    @Test
     public void testDailyLimiting() throws InterruptedException {
         mMonitor = new TestableLingerMonitor(mCtx, mNotifier, LOW_DAILY_LIMIT, HIGH_RATE_LIMIT);
 
@@ -221,7 +231,7 @@
         verifyNoNotifications();
     }
 
-    @SmallTest
+    @Test
     public void testUniqueNotification() {
         setNotificationSwitch(transition(WIFI, CELLULAR));
         setNotificationType(LingerMonitor.NOTIFY_TYPE_NOTIFICATION);
@@ -238,7 +248,7 @@
         verifyNotification(from, to);
     }
 
-    @SmallTest
+    @Test
     public void testIgnoreNeverValidatedNetworks() {
         setNotificationType(LingerMonitor.NOTIFY_TYPE_TOAST);
         setNotificationSwitch(transition(WIFI, CELLULAR));
@@ -250,7 +260,7 @@
         verifyNoNotifications();
     }
 
-    @SmallTest
+    @Test
     public void testIgnoreCurrentlyValidatedNetworks() {
         setNotificationType(LingerMonitor.NOTIFY_TYPE_TOAST);
         setNotificationSwitch(transition(WIFI, CELLULAR));
@@ -262,7 +272,7 @@
         verifyNoNotifications();
     }
 
-    @SmallTest
+    @Test
     public void testNoNotificationType() {
         setNotificationType(LingerMonitor.NOTIFY_TYPE_TOAST);
         setNotificationSwitch();
@@ -273,7 +283,7 @@
         verifyNoNotifications();
     }
 
-    @SmallTest
+    @Test
     public void testNoTransitionToNotify() {
         setNotificationType(LingerMonitor.NOTIFY_TYPE_NONE);
         setNotificationSwitch(transition(WIFI, CELLULAR));
@@ -284,7 +294,7 @@
         verifyNoNotifications();
     }
 
-    @SmallTest
+    @Test
     public void testDifferentTransitionToNotify() {
         setNotificationType(LingerMonitor.NOTIFY_TYPE_TOAST);
         setNotificationSwitch(transition(CELLULAR, WIFI));
diff --git a/tests/net/java/com/android/server/connectivity/NetworkNotificationManagerTest.java b/tests/net/java/com/android/server/connectivity/NetworkNotificationManagerTest.java
index 911347c..125fe72 100644
--- a/tests/net/java/com/android/server/connectivity/NetworkNotificationManagerTest.java
+++ b/tests/net/java/com/android/server/connectivity/NetworkNotificationManagerTest.java
@@ -34,20 +34,29 @@
 import android.content.res.Resources;
 import android.net.NetworkCapabilities;
 import android.net.NetworkInfo;
+import android.support.test.runner.AndroidJUnit4;
+import android.support.test.filters.SmallTest;
 import android.telephony.TelephonyManager;
-import android.test.suitebuilder.annotation.SmallTest;
+
 import com.android.server.connectivity.NetworkNotificationManager.NotificationType;
+
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
-import junit.framework.TestCase;
+
+import org.junit.runner.RunWith;
+import org.junit.Before;
+import org.junit.Test;
 import org.mockito.ArgumentCaptor;
 import org.mockito.Mock;
 import org.mockito.Mockito;
 import org.mockito.MockitoAnnotations;
 
-public class NetworkNotificationManagerTest extends TestCase {
+
+@RunWith(AndroidJUnit4.class)
+@SmallTest
+public class NetworkNotificationManagerTest {
 
     static final NetworkCapabilities CELL_CAPABILITIES = new NetworkCapabilities();
     static final NetworkCapabilities WIFI_CAPABILITIES = new NetworkCapabilities();
@@ -71,6 +80,7 @@
 
     NetworkNotificationManager mManager;
 
+    @Before
     public void setUp() {
         MockitoAnnotations.initMocks(this);
         mCaptor = ArgumentCaptor.forClass(Notification.class);
@@ -87,7 +97,7 @@
         mManager = new NetworkNotificationManager(mCtx, mTelephonyManager, mNotificationManager);
     }
 
-    @SmallTest
+    @Test
     public void testNotificationsShownAndCleared() {
         final int NETWORK_ID_BASE = 100;
         List<NotificationType> types = Arrays.asList(NotificationType.values());
@@ -117,7 +127,7 @@
         }
     }
 
-    @SmallTest
+    @Test
     public void testNoInternetNotificationsNotShownForCellular() {
         mManager.showNotification(100, NO_INTERNET, mCellNai, mWifiNai, null, false);
         mManager.showNotification(101, LOST_INTERNET, mCellNai, mWifiNai, null, false);
@@ -131,7 +141,7 @@
         verify(mNotificationManager, times(1)).notifyAsUser(eq(tag), eq(eventId), any(), any());
     }
 
-    @SmallTest
+    @Test
     public void testNotificationsNotShownIfNoInternetCapability() {
         mWifiNai.networkCapabilities = new NetworkCapabilities();
         mWifiNai.networkCapabilities .addTransportType(NetworkCapabilities.TRANSPORT_WIFI);
@@ -142,7 +152,7 @@
         verify(mNotificationManager, never()).notifyAsUser(any(), anyInt(), any(), any());
     }
 
-    @SmallTest
+    @Test
     public void testDuplicatedNotificationsNoInternetThenSignIn() {
         final int id = 101;
         final String tag = NetworkNotificationManager.tagFor(id);
@@ -164,7 +174,7 @@
         verify(mNotificationManager, times(1)).cancelAsUser(eq(tag), eq(SIGN_IN.eventId), any());
     }
 
-    @SmallTest
+    @Test
     public void testDuplicatedNotificationsSignInThenNoInternet() {
         final int id = 101;
         final String tag = NetworkNotificationManager.tagFor(id);
diff --git a/tests/net/java/com/android/server/connectivity/VpnTest.java b/tests/net/java/com/android/server/connectivity/VpnTest.java
index 4f18da7..fe396c3 100644
--- a/tests/net/java/com/android/server/connectivity/VpnTest.java
+++ b/tests/net/java/com/android/server/connectivity/VpnTest.java
@@ -20,6 +20,9 @@
 import static android.content.pm.UserInfo.FLAG_MANAGED_PROFILE;
 import static android.content.pm.UserInfo.FLAG_PRIMARY;
 import static android.content.pm.UserInfo.FLAG_RESTRICTED;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
 import static org.mockito.AdditionalMatchers.*;
 import static org.mockito.Mockito.*;
 
@@ -42,14 +45,17 @@
 import android.os.Looper;
 import android.os.UserHandle;
 import android.os.UserManager;
-import android.test.AndroidTestCase;
-import android.test.suitebuilder.annotation.SmallTest;
+import android.support.test.runner.AndroidJUnit4;
+import android.support.test.filters.SmallTest;
 import android.util.ArrayMap;
 import android.util.ArraySet;
 
 import com.android.internal.R;
 import com.android.internal.net.VpnConfig;
 
+import org.junit.runner.RunWith;
+import org.junit.Before;
+import org.junit.Test;
 import org.mockito.Answers;
 import org.mockito.InOrder;
 import org.mockito.Mock;
@@ -61,13 +67,16 @@
 import java.util.Map;
 import java.util.Set;
 
+
 /**
  * Tests for {@link Vpn}.
  *
  * Build, install and run with:
- *  runtest --path java/com/android/server/connectivity/VpnTest.java
+ *  runtest frameworks-net -c com.android.server.connectivity.VpnTest
  */
-public class VpnTest extends AndroidTestCase {
+@RunWith(AndroidJUnit4.class)
+@SmallTest
+public class VpnTest {
     private static final String TAG = "VpnTest";
 
     // Mock users
@@ -106,7 +115,7 @@
     @Mock private NotificationManager mNotificationManager;
     @Mock private Vpn.SystemServices mSystemServices;
 
-    @Override
+    @Before
     public void setUp() throws Exception {
         MockitoAnnotations.initMocks(this);
 
@@ -130,7 +139,7 @@
         doNothing().when(mNetService).registerObserver(any());
     }
 
-    @SmallTest
+    @Test
     public void testRestrictedProfilesAreAddedToVpn() {
         setMockedUsers(primaryUser, secondaryUser, restrictedProfileA, restrictedProfileB);
 
@@ -144,7 +153,7 @@
         })), ranges);
     }
 
-    @SmallTest
+    @Test
     public void testManagedProfilesAreNotAddedToVpn() {
         setMockedUsers(primaryUser, managedProfileA);
 
@@ -157,7 +166,7 @@
         })), ranges);
     }
 
-    @SmallTest
+    @Test
     public void testAddUserToVpnOnlyAddsOneUser() {
         setMockedUsers(primaryUser, restrictedProfileA, managedProfileA);
 
@@ -170,7 +179,7 @@
         })), ranges);
     }
 
-    @SmallTest
+    @Test
     public void testUidWhiteAndBlacklist() throws Exception {
         final Vpn vpn = createVpn(primaryUser.id);
         final UidRange user = UidRange.createForUser(primaryUser.id);
@@ -195,7 +204,7 @@
         })), disallow);
     }
 
-    @SmallTest
+    @Test
     public void testLockdownChangingPackage() throws Exception {
         final Vpn vpn = createVpn(primaryUser.id);
         final UidRange user = UidRange.createForUser(primaryUser.id);
@@ -230,7 +239,7 @@
         assertUnblocked(vpn, user.start + PKG_UIDS[3]);
     }
 
-    @SmallTest
+    @Test
     public void testLockdownAddingAProfile() throws Exception {
         final Vpn vpn = createVpn(primaryUser.id);
         setMockedUsers(primaryUser);
@@ -270,7 +279,7 @@
         }));
     }
 
-    @SmallTest
+    @Test
     public void testLockdownRuleRepeatability() throws Exception {
         final Vpn vpn = createVpn(primaryUser.id);
 
@@ -293,7 +302,7 @@
         verify(mNetService, times(2)).setAllowOnlyVpnForUids(anyBoolean(), any(UidRange[].class));
     }
 
-    @SmallTest
+    @Test
     public void testLockdownRuleReversibility() throws Exception {
         final Vpn vpn = createVpn(primaryUser.id);
 
@@ -322,7 +331,7 @@
         order.verify(mNetService).setAllowOnlyVpnForUids(eq(true), aryEq(entireUser));
     }
 
-    @SmallTest
+    @Test
     public void testIsAlwaysOnPackageSupported() throws Exception {
         final Vpn vpn = createVpn(primaryUser.id);
 
@@ -356,7 +365,7 @@
         assertFalse(vpn.isAlwaysOnPackageSupported(PKGS[0]));
     }
 
-    @SmallTest
+    @Test
     public void testNotificationShownForAlwaysOnApp() {
         final UserHandle userHandle = UserHandle.of(primaryUser.id);
         final Vpn vpn = createVpn(primaryUser.id);