Fix test which is relying on wrong Robolectric behavior.

Robolectric calls messages posted to the main thread immediately inline. This
will change in the upcoming release and will break tests implicitly relying
on that behavior.

Update ConcatenatingMediaSourceTest to actually wait for the posted message.

PiperOrigin-RevId: 242631531

library/core/src/test/java/com/google/android/exoplayer2/source/ConcatenatingMediaSourceTest.java

@@ -18,7 +18,6 @@ package com.google.android.exoplayer2.source;
 import static com.google.common.truth.Truth.assertThat;
 import static org.junit.Assert.fail;
 import static org.mockito.Mockito.mock;
-import static org.mockito.Mockito.verify;
 
 import android.os.ConditionVariable;
 import android.os.Handler;
@@ -417,60 +416,101 @@ public final class ConcatenatingMediaSourceTest {
 
   @Test
   public void testCustomCallbackBeforePreparationAddSingle() {
-    Runnable runnable = mock(Runnable.class);
+    ConditionVariable runnableInvoked = new ConditionVariable();
 
-    mediaSource.addMediaSource(createFakeMediaSource(), new Handler(), runnable);
-    verify(runnable).run();
+    DummyMainThread dummyMainThread = new DummyMainThread();
+    dummyMainThread.runOnMainThread(
+        () ->
+            mediaSource.addMediaSource(
+                createFakeMediaSource(), new Handler(), runnableInvoked::open));
+    runnableInvoked.block(MediaSourceTestRunner.TIMEOUT_MS);
+    dummyMainThread.release();
+
+    assertThat(runnableInvoked.block(0)).isTrue();
   }
 
   @Test
   public void testCustomCallbackBeforePreparationAddMultiple() {
-    Runnable runnable = mock(Runnable.class);
+    ConditionVariable runnableInvoked = new ConditionVariable();
 
-    mediaSource.addMediaSources(
-        Arrays.asList(new MediaSource[] {createFakeMediaSource(), createFakeMediaSource()}),
-        new Handler(),
-        runnable);
-    verify(runnable).run();
+    DummyMainThread dummyMainThread = new DummyMainThread();
+    dummyMainThread.runOnMainThread(
+        () ->
+            mediaSource.addMediaSources(
+                Arrays.asList(new MediaSource[] {createFakeMediaSource(), createFakeMediaSource()}),
+                new Handler(),
+                runnableInvoked::open));
+    runnableInvoked.block(MediaSourceTestRunner.TIMEOUT_MS);
+    dummyMainThread.release();
+
+    assertThat(runnableInvoked.block(0)).isTrue();
   }
 
   @Test
   public void testCustomCallbackBeforePreparationAddSingleWithIndex() {
-    Runnable runnable = mock(Runnable.class);
+    ConditionVariable runnableInvoked = new ConditionVariable();
 
-    mediaSource.addMediaSource(/* index */ 0, createFakeMediaSource(), new Handler(), runnable);
-    verify(runnable).run();
+    DummyMainThread dummyMainThread = new DummyMainThread();
+    dummyMainThread.runOnMainThread(
+        () ->
+            mediaSource.addMediaSource(
+                /* index */ 0, createFakeMediaSource(), new Handler(), runnableInvoked::open));
+    runnableInvoked.block(MediaSourceTestRunner.TIMEOUT_MS);
+    dummyMainThread.release();
+
+    assertThat(runnableInvoked.block(0)).isTrue();
   }
 
   @Test
   public void testCustomCallbackBeforePreparationAddMultipleWithIndex() {
-    Runnable runnable = mock(Runnable.class);
+    ConditionVariable runnableInvoked = new ConditionVariable();
 
-    mediaSource.addMediaSources(
-        /* index */ 0,
-        Arrays.asList(new MediaSource[] {createFakeMediaSource(), createFakeMediaSource()}),
-        new Handler(),
-        runnable);
-    verify(runnable).run();
+    DummyMainThread dummyMainThread = new DummyMainThread();
+    dummyMainThread.runOnMainThread(
+        () ->
+            mediaSource.addMediaSources(
+                /* index */ 0,
+                Arrays.asList(new MediaSource[] {createFakeMediaSource(), createFakeMediaSource()}),
+                new Handler(),
+                runnableInvoked::open));
+    runnableInvoked.block(MediaSourceTestRunner.TIMEOUT_MS);
+    dummyMainThread.release();
+
+    assertThat(runnableInvoked.block(0)).isTrue();
   }
 
   @Test
   public void testCustomCallbackBeforePreparationRemove() {
-    Runnable runnable = mock(Runnable.class);
+    ConditionVariable runnableInvoked = new ConditionVariable();
 
-    mediaSource.addMediaSource(createFakeMediaSource());
-    mediaSource.removeMediaSource(/* index */ 0, new Handler(), runnable);
-    verify(runnable).run();
+    DummyMainThread dummyMainThread = new DummyMainThread();
+    dummyMainThread.runOnMainThread(
+        () -> {
+          mediaSource.addMediaSource(createFakeMediaSource());
+          mediaSource.removeMediaSource(/* index */ 0, new Handler(), runnableInvoked::open);
+        });
+    runnableInvoked.block(MediaSourceTestRunner.TIMEOUT_MS);
+    dummyMainThread.release();
+
+    assertThat(runnableInvoked.block(0)).isTrue();
   }
 
   @Test
   public void testCustomCallbackBeforePreparationMove() {
-    Runnable runnable = mock(Runnable.class);
+    ConditionVariable runnableInvoked = new ConditionVariable();
 
-    mediaSource.addMediaSources(
-        Arrays.asList(new MediaSource[] {createFakeMediaSource(), createFakeMediaSource()}));
-    mediaSource.moveMediaSource(/* fromIndex */ 1, /* toIndex */ 0, new Handler(), runnable);
-    verify(runnable).run();
+    DummyMainThread dummyMainThread = new DummyMainThread();
+    dummyMainThread.runOnMainThread(
+        () -> {
+          mediaSource.addMediaSources(
+              Arrays.asList(new MediaSource[] {createFakeMediaSource(), createFakeMediaSource()}));
+          mediaSource.moveMediaSource(
+              /* fromIndex */ 1, /* toIndex */ 0, new Handler(), runnableInvoked::open);
+        });
+    runnableInvoked.block(MediaSourceTestRunner.TIMEOUT_MS);
+    dummyMainThread.release();
+
+    assertThat(runnableInvoked.block(0)).isTrue();
   }
 
   @Test
@@ -997,11 +1037,19 @@ public final class ConcatenatingMediaSourceTest {
 
   @Test
   public void testCustomCallbackBeforePreparationSetShuffleOrder() throws Exception {
-    Runnable runnable = mock(Runnable.class);
-    mediaSource.setShuffleOrder(
-        new ShuffleOrder.UnshuffledShuffleOrder(/* length= */ 0), new Handler(), runnable);
+    ConditionVariable runnableInvoked = new ConditionVariable();
+
+    DummyMainThread dummyMainThread = new DummyMainThread();
+    dummyMainThread.runOnMainThread(
+        () ->
+            mediaSource.setShuffleOrder(
+                new ShuffleOrder.UnshuffledShuffleOrder(/* length= */ 0),
+                new Handler(),
+                runnableInvoked::open));
+    runnableInvoked.block(MediaSourceTestRunner.TIMEOUT_MS);
+    dummyMainThread.release();
 
-    verify(runnable).run();
+    assertThat(runnableInvoked.block(0)).isTrue();
   }
 
   @Test