Make it easier to update extractor test dump files

PiperOrigin-RevId: 285407744

testutils/src/main/java/com/google/android/exoplayer2/testutil/FakeExtractorOutput.java

@@ -33,9 +33,11 @@ import java.io.PrintWriter;
 public final class FakeExtractorOutput implements ExtractorOutput, Dumper.Dumpable {
 
   /**
-   * If true, makes {@link #assertOutput(Context, String)} method write dump result to {@code
-   * /sdcard/Android/data/apk_package/ + dumpfile} file instead of comparing it with an existing
-   * file.
+   * If true, makes {@link #assertOutput(Context, String)} method write the output to the dump file,
+   * rather than validating that the output matches what the dump file already contains.
+   *
+   * <p>Enabling this option works when tests are run in Android Studio. It may not work when the
+   * tests are run in another environment.
    */
   private static final boolean WRITE_DUMP = false;
 
@@ -121,8 +123,8 @@ public final class FakeExtractorOutput implements ExtractorOutput, Dumper.Dumpab
     String actual = new Dumper().add(this).toString();
 
     if (WRITE_DUMP) {
-      File directory = context.getExternalFilesDir(null);
-      File file = new File(directory, dumpFile);
+      File file = new File(System.getProperty("user.dir"), "src/test/assets");
+      file = new File(file, dumpFile);
       file.getParentFile().mkdirs();
       PrintWriter out = new PrintWriter(file);
       out.print(actual);