Mike Ma | 2ab0144 | 2018-02-13 14:22:47 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2018 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package com.android.internal.os; |
| 18 | |
| 19 | import static org.junit.Assert.assertEquals; |
| 20 | import static org.junit.Assert.assertNotNull; |
| 21 | import static org.junit.Assert.assertNull; |
| 22 | import static org.junit.Assert.assertTrue; |
| 23 | |
| 24 | import android.content.Context; |
| 25 | import android.os.FileUtils; |
| 26 | import android.os.SystemClock; |
| 27 | import android.support.test.InstrumentationRegistry; |
| 28 | import android.support.test.filters.SmallTest; |
| 29 | import android.support.test.runner.AndroidJUnit4; |
| 30 | |
| 31 | import org.junit.After; |
| 32 | import org.junit.Before; |
| 33 | import org.junit.Test; |
| 34 | import org.junit.runner.RunWith; |
| 35 | |
| 36 | import java.io.File; |
| 37 | import java.io.OutputStream; |
| 38 | import java.nio.ByteBuffer; |
| 39 | import java.nio.file.Files; |
| 40 | import java.util.Arrays; |
| 41 | import java.util.Random; |
| 42 | |
| 43 | /** |
| 44 | * Test class for {@link KernelCpuProcReader}. |
| 45 | * |
| 46 | * $ atest FrameworksCoreTests:com.android.internal.os.KernelCpuProcReader |
| 47 | */ |
| 48 | @SmallTest |
| 49 | @RunWith(AndroidJUnit4.class) |
| 50 | public class KernelCpuProcReaderTest { |
| 51 | |
| 52 | private File mRoot; |
| 53 | private File mTestDir; |
| 54 | private File mTestFile; |
| 55 | private Random mRand = new Random(); |
| 56 | |
| 57 | private KernelCpuProcReader mKernelCpuProcReader; |
| 58 | |
| 59 | private Context getContext() { |
| 60 | return InstrumentationRegistry.getContext(); |
| 61 | } |
| 62 | |
| 63 | @Before |
| 64 | public void setUp() { |
| 65 | mTestDir = getContext().getDir("test", Context.MODE_PRIVATE); |
| 66 | mRoot = getContext().getFilesDir(); |
| 67 | mTestFile = new File(mTestDir, "test.file"); |
| 68 | mKernelCpuProcReader = new KernelCpuProcReader(mTestFile.getAbsolutePath()); |
| 69 | } |
| 70 | |
| 71 | @After |
| 72 | public void tearDown() throws Exception { |
| 73 | FileUtils.deleteContents(mTestDir); |
| 74 | FileUtils.deleteContents(mRoot); |
| 75 | } |
| 76 | |
| 77 | |
| 78 | /** |
| 79 | * Tests that reading will return null if the file does not exist. |
| 80 | */ |
| 81 | @Test |
| 82 | public void testReadInvalidFile() throws Exception { |
| 83 | assertEquals(null, mKernelCpuProcReader.readBytes()); |
| 84 | } |
| 85 | |
| 86 | /** |
| 87 | * Tests that reading will always return null after 5 failures. |
| 88 | */ |
| 89 | @Test |
| 90 | public void testReadErrorsLimit() throws Exception { |
| 91 | mKernelCpuProcReader.setThrottleInterval(0); |
| 92 | for (int i = 0; i < 3; i++) { |
| 93 | assertNull(mKernelCpuProcReader.readBytes()); |
| 94 | SystemClock.sleep(50); |
| 95 | } |
| 96 | |
| 97 | final byte[] data = new byte[1024]; |
| 98 | mRand.nextBytes(data); |
| 99 | try (OutputStream os = Files.newOutputStream(mTestFile.toPath())) { |
| 100 | os.write(data); |
| 101 | } |
| 102 | assertTrue(Arrays.equals(data, toArray(mKernelCpuProcReader.readBytes()))); |
| 103 | |
| 104 | assertTrue(mTestFile.delete()); |
| 105 | for (int i = 0; i < 3; i++) { |
| 106 | assertNull(mKernelCpuProcReader.readBytes()); |
| 107 | SystemClock.sleep(50); |
| 108 | } |
| 109 | try (OutputStream os = Files.newOutputStream(mTestFile.toPath())) { |
| 110 | os.write(data); |
| 111 | } |
| 112 | assertNull(mKernelCpuProcReader.readBytes()); |
| 113 | } |
| 114 | |
| 115 | /** |
| 116 | * Tests reading functionality. |
| 117 | */ |
| 118 | @Test |
| 119 | public void testSimpleRead() throws Exception { |
| 120 | final byte[] data = new byte[1024]; |
| 121 | mRand.nextBytes(data); |
| 122 | try (OutputStream os = Files.newOutputStream(mTestFile.toPath())) { |
| 123 | os.write(data); |
| 124 | } |
| 125 | assertTrue(Arrays.equals(data, toArray(mKernelCpuProcReader.readBytes()))); |
| 126 | } |
| 127 | |
| 128 | /** |
| 129 | * Tests multiple reading functionality. |
| 130 | */ |
| 131 | @Test |
| 132 | public void testMultipleRead() throws Exception { |
| 133 | mKernelCpuProcReader.setThrottleInterval(0); |
| 134 | for (int i = 0; i < 100; i++) { |
| 135 | final byte[] data = new byte[mRand.nextInt(102400) + 4]; |
| 136 | mRand.nextBytes(data); |
| 137 | try (OutputStream os = Files.newOutputStream(mTestFile.toPath())) { |
| 138 | os.write(data); |
| 139 | } |
| 140 | assertTrue(Arrays.equals(data, toArray(mKernelCpuProcReader.readBytes()))); |
| 141 | assertTrue(mTestFile.delete()); |
| 142 | } |
| 143 | } |
| 144 | |
| 145 | /** |
| 146 | * Tests reading with resizing. |
| 147 | */ |
| 148 | @Test |
| 149 | public void testReadWithResize() throws Exception { |
| 150 | final byte[] data = new byte[128001]; |
| 151 | mRand.nextBytes(data); |
| 152 | try (OutputStream os = Files.newOutputStream(mTestFile.toPath())) { |
| 153 | os.write(data); |
| 154 | } |
| 155 | assertTrue(Arrays.equals(data, toArray(mKernelCpuProcReader.readBytes()))); |
| 156 | } |
| 157 | |
| 158 | /** |
| 159 | * Tests that reading a file over the limit (1MB) will return null. |
| 160 | */ |
| 161 | @Test |
| 162 | public void testReadOverLimit() throws Exception { |
| 163 | final byte[] data = new byte[1228800]; |
| 164 | mRand.nextBytes(data); |
| 165 | try (OutputStream os = Files.newOutputStream(mTestFile.toPath())) { |
| 166 | os.write(data); |
| 167 | } |
| 168 | assertNull(mKernelCpuProcReader.readBytes()); |
| 169 | } |
| 170 | |
| 171 | /** |
| 172 | * Tests throttling. Deleting underlying file should not affect cache. |
| 173 | */ |
| 174 | @Test |
| 175 | public void testThrottle() throws Exception { |
| 176 | mKernelCpuProcReader.setThrottleInterval(3000); |
| 177 | final byte[] data = new byte[20001]; |
| 178 | mRand.nextBytes(data); |
| 179 | try (OutputStream os = Files.newOutputStream(mTestFile.toPath())) { |
| 180 | os.write(data); |
| 181 | } |
| 182 | assertTrue(Arrays.equals(data, toArray(mKernelCpuProcReader.readBytes()))); |
| 183 | assertTrue(mTestFile.delete()); |
| 184 | for (int i = 0; i < 5; i++) { |
| 185 | assertTrue(Arrays.equals(data, toArray(mKernelCpuProcReader.readBytes()))); |
| 186 | SystemClock.sleep(10); |
| 187 | } |
| 188 | SystemClock.sleep(5000); |
| 189 | assertNull(mKernelCpuProcReader.readBytes()); |
| 190 | } |
| 191 | |
| 192 | private byte[] toArray(ByteBuffer buffer) { |
| 193 | assertNotNull(buffer); |
| 194 | byte[] arr = new byte[buffer.remaining()]; |
| 195 | buffer.get(arr); |
| 196 | return arr; |
| 197 | } |
| 198 | } |