Move assets from core to testdata module

PiperOrigin-RevId: 294239472

library/core/build.gradle

@@ -41,6 +41,11 @@ android {
         }
     }
 
+    sourceSets {
+        androidTest.assets.srcDir '../../testdata/src/test/assets/'
+        test.assets.srcDir '../../testdata/src/test/assets/'
+    }
+
     testOptions.unitTests.includeAndroidResources = true
 }
 

library/core/src/androidTest/java/com/google/android/exoplayer2/upstream/ContentDataSourceTest.java

@@ -43,7 +43,7 @@ import org.junit.runner.RunWith;
 public final class ContentDataSourceTest {
 
   private static final String AUTHORITY = "com.google.android.exoplayer2.core.test";
-  private static final String DATA_PATH = "binary/1024_incrementing_bytes.mp3";
+  private static final String DATA_PATH = "mp3/1024_incrementing_bytes.mp3";
 
   @Test
   public void testRead() throws Exception {

library/core/src/test/java/com/google/android/exoplayer2/upstream/AssetDataSourceTest.java

@@ -26,7 +26,7 @@ import org.junit.runner.RunWith;
 @RunWith(AndroidJUnit4.class)
 public final class AssetDataSourceTest {
 
-  private static final String DATA_PATH = "binary/1024_incrementing_bytes.mp3";
+  private static final String DATA_PATH = "mp3/1024_incrementing_bytes.mp3";
 
   @Test
   public void testReadFileUri() throws Exception {