| /* |
| * Copyright (C) 2019 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.server.timedetector; |
| |
| import static org.junit.Assert.assertEquals; |
| import static org.junit.Assert.assertNotNull; |
| |
| import androidx.test.runner.AndroidJUnit4; |
| |
| import com.android.internal.util.IndentingPrintWriter; |
| import com.android.server.timezonedetector.ReferenceWithHistory; |
| |
| import org.junit.Test; |
| import org.junit.runner.RunWith; |
| |
| import java.io.StringWriter; |
| |
| @RunWith(AndroidJUnit4.class) |
| public class ReferenceWithHistoryTest { |
| |
| @Test |
| public void testBasicReferenceBehavior() { |
| // Create a reference that will retain 2 history values. |
| ReferenceWithHistory<String> referenceWithHistory = |
| new ReferenceWithHistory<>(2 /* history */); |
| TestRef<String> reference = new TestRef<>(); |
| |
| // Check unset behavior. |
| compareGet(referenceWithHistory, reference, null); |
| assertNotNull(dumpReferenceWithHistory(referenceWithHistory)); |
| compareToString(referenceWithHistory, reference, "null"); |
| |
| // Try setting null. |
| setAndCompareReturnValue(referenceWithHistory, reference, null); |
| compareGet(referenceWithHistory, reference, null); |
| assertNotNull(dumpReferenceWithHistory(referenceWithHistory)); |
| compareToString(referenceWithHistory, reference, "null"); |
| |
| // Try setting a non-null value. |
| setAndCompareReturnValue(referenceWithHistory, reference, "Foo"); |
| compareGet(referenceWithHistory, reference, "Foo"); |
| assertNotNull(dumpReferenceWithHistory(referenceWithHistory)); |
| compareToString(referenceWithHistory, reference, "Foo"); |
| |
| // Try setting null again. |
| setAndCompareReturnValue(referenceWithHistory, reference, "Foo"); |
| compareGet(referenceWithHistory, reference, "Foo"); |
| assertNotNull(dumpReferenceWithHistory(referenceWithHistory)); |
| compareToString(referenceWithHistory, reference, "Foo"); |
| |
| // Try a non-null value again. |
| setAndCompareReturnValue(referenceWithHistory, reference, "Bar"); |
| compareGet(referenceWithHistory, reference, "Bar"); |
| assertNotNull(dumpReferenceWithHistory(referenceWithHistory)); |
| compareToString(referenceWithHistory, reference, "Bar"); |
| } |
| |
| @Test |
| public void testValueHistoryBehavior() { |
| // Create a reference that will retain 2 history values. |
| ReferenceWithHistory<String> referenceWithHistory = |
| new ReferenceWithHistory<>(2 /* history */); |
| TestRef<String> reference = new TestRef<>(); |
| |
| // Assert behavior before anything is set. |
| assertEquals(0, referenceWithHistory.getHistoryCount()); |
| |
| // Set a value (1). |
| setAndCompareReturnValue(referenceWithHistory, reference, "V1"); |
| assertEquals(1, referenceWithHistory.getHistoryCount()); |
| |
| // Set a value (2). |
| setAndCompareReturnValue(referenceWithHistory, reference, "V2"); |
| assertEquals(2, referenceWithHistory.getHistoryCount()); |
| |
| // Set a value (3). |
| // We should have hit the limit of "2 history values retained per key". |
| setAndCompareReturnValue(referenceWithHistory, reference, "V3"); |
| assertEquals(2, referenceWithHistory.getHistoryCount()); |
| } |
| |
| /** |
| * A simple class that has the same behavior as ReferenceWithHistory without the history. Used |
| * in tests for comparison. |
| */ |
| private static class TestRef<V> { |
| private V mValue; |
| |
| public V get() { |
| return mValue; |
| } |
| |
| public V set(V value) { |
| V previous = mValue; |
| mValue = value; |
| return previous; |
| } |
| |
| public String toString() { |
| return String.valueOf(mValue); |
| } |
| } |
| |
| private static void compareGet( |
| ReferenceWithHistory<?> referenceWithHistory, TestRef<?> reference, Object value) { |
| assertEquals(reference.get(), referenceWithHistory.get()); |
| assertEquals(value, reference.get()); |
| } |
| |
| private static <T> void setAndCompareReturnValue( |
| ReferenceWithHistory<T> referenceWithHistory, TestRef<T> reference, T newValue) { |
| assertEquals(reference.set(newValue), referenceWithHistory.set(newValue)); |
| } |
| |
| private static void compareToString( |
| ReferenceWithHistory<?> referenceWithHistory, TestRef<?> reference, String expected) { |
| assertEquals(reference.toString(), referenceWithHistory.toString()); |
| assertEquals(expected, referenceWithHistory.toString()); |
| } |
| |
| private static String dumpReferenceWithHistory(ReferenceWithHistory<?> referenceWithHistory) { |
| StringWriter stringWriter = new StringWriter(); |
| try (IndentingPrintWriter ipw = new IndentingPrintWriter(stringWriter, " ")) { |
| referenceWithHistory.dump(ipw); |
| return stringWriter.toString(); |
| } |
| } |
| } |