text: /*
   * Copyright (C) 2017 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.systemui.util.leak;
  
  
  import androidx.test.filters.SmallTest;
  import androidx.test.runner.AndroidJUnit4;
  
  import com.android.systemui.SysuiTestCase;
  import com.android.systemui.util.leak.ReferenceTestUtils.CollectionWaiter;
  
  import org.junit.Before;
  import org.junit.Ignore;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  
  import java.io.FileOutputStream;
  import java.io.PrintWriter;
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.function.BiConsumer;
  import java.util.function.Consumer;
  
  @SmallTest
  @RunWith(AndroidJUnit4.class)
  public class LeakDetectorTest extends SysuiTestCase {
  
      private LeakDetector mLeakDetector;
  
      // The references for which collection is observed are stored in fields. The allocation and
      // of these references happens in separate methods (trackObjectWith/trackCollectionWith)
      // from where they are set to null. The generated code might keep the allocated reference
      // alive in a dex register when compiling in release mode. As R8 is used to compile this
      // test the --dontoptimize flag is also required to ensure that these methods are not
      // inlined, as that would defeat the purpose of having the mutation in methods.
      private Object mObject;
      private Collection<?> mCollection;
  
      private CollectionWaiter trackObjectWith(Consumer<Object> tracker) {
          mObject = new Object();
          CollectionWaiter collectionWaiter = ReferenceTestUtils.createCollectionWaiter(mObject);
          tracker.accept(mObject);
          return collectionWaiter;
      }
  
      private CollectionWaiter trackCollectionWith(
              BiConsumer<? super Collection<?>, String> tracker) {
          mCollection = new ArrayList<>();
          CollectionWaiter collectionWaiter = ReferenceTestUtils.createCollectionWaiter(mCollection);
          tracker.accept(mCollection, "tag");
          return collectionWaiter;
      }
  
      @Before
      public void setup() {
          mLeakDetector = LeakDetector.create();
  
          // Note: Do not try to factor out object / collection waiter creation. The optimizer will
          // try and cache accesses to fields and thus create a GC root for the duration of the test
          // method, thus breaking the test.
      }
  
      @Test
      public void trackInstance_doesNotLeakTrackedObject() {
          CollectionWaiter collectionWaiter = trackObjectWith(mLeakDetector::trackInstance);
          mObject = null;
          collectionWaiter.waitForCollection();
      }
  
      @Ignore("b/75329085")
      @Test
      public void trackCollection_doesNotLeakTrackedObject() {
          CollectionWaiter collectionWaiter = trackCollectionWith(mLeakDetector::trackCollection);
          mCollection = null;
          collectionWaiter.waitForCollection();
      }
  
      @Test
      public void trackGarbage_doesNotLeakTrackedObject() {
          CollectionWaiter collectionWaiter = trackObjectWith(mLeakDetector::trackGarbage);
          mObject = null;
          collectionWaiter.waitForCollection();
      }
  
      @Test
      public void testDump() throws Exception {
          Object o1 = new Object();
          Object o2 = new Object();
          Collection<Object> col1 = new ArrayList<>();
  
          mLeakDetector.trackInstance(o1);
          mLeakDetector.trackCollection(col1, "tag");
          mLeakDetector.trackGarbage(o2);
  
          FileOutputStream fos = new FileOutputStream("/dev/null");
          mLeakDetector.dump(fos.getFD(), new PrintWriter(fos), new String[0]);
      }
  
      @Test
      public void testDisabled() throws Exception {
          mLeakDetector = new LeakDetector(null, null, null);
  
          Object o1 = new Object();
          Object o2 = new Object();
          Collection<Object> col1 = new ArrayList<>();
  
          mLeakDetector.trackInstance(o1);
          mLeakDetector.trackCollection(col1, "tag");
          mLeakDetector.trackGarbage(o2);
  
          FileOutputStream fos = new FileOutputStream("/dev/null");
          mLeakDetector.dump(fos.getFD(), new PrintWriter(fos), new String[0]);
      }
  }
  