Move DataSourceContractTest to the testutil package

PiperOrigin-RevId: 343096974

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

@@ -17,6 +17,7 @@ package com.google.android.exoplayer2.upstream;
 
 import android.net.Uri;
 import androidx.test.ext.junit.runners.AndroidJUnit4;
+import com.google.android.exoplayer2.testutil.DataSourceContractTest;
 import com.google.android.exoplayer2.testutil.TestUtil;
 import com.google.common.collect.ImmutableList;
 import java.io.File;

testutils/src/main/java/com/google/android/exoplayer2/upstream/DataSourceContractTest.java → testutils/src/main/java/com/google/android/exoplayer2/testutil/DataSourceContractTest.java

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package com.google.android.exoplayer2.upstream;
+package com.google.android.exoplayer2.testutil;
 
 import static com.google.android.exoplayer2.util.Assertions.checkNotNull;
 import static com.google.common.truth.Truth.assertWithMessage;
@@ -22,6 +22,8 @@ import static org.junit.Assert.assertThrows;
 import android.net.Uri;
 import androidx.annotation.Nullable;
 import com.google.android.exoplayer2.C;
+import com.google.android.exoplayer2.upstream.DataSource;
+import com.google.android.exoplayer2.upstream.DataSpec;
 import com.google.android.exoplayer2.util.Assertions;
 import com.google.android.exoplayer2.util.Util;
 import com.google.common.collect.ImmutableList;