Add FakeDataSourceContractTest

PiperOrigin-RevId: 359095093

testutils/src/test/java/com/google/android/exoplayer2/testutil/FakeDataSourceContractTest.java

+/*
+ * Copyright 2021 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.google.android.exoplayer2.testutil;
+
+import android.net.Uri;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+import com.google.android.exoplayer2.upstream.DataSource;
+import com.google.common.collect.ImmutableList;
+import org.junit.Before;
+import org.junit.runner.RunWith;
+
+/** {@link DataSource} contract tests for {@link FakeDataSource}. */
+@RunWith(AndroidJUnit4.class)
+public class FakeDataSourceContractTest extends DataSourceContractTest {
+
+  private Uri simpleUri;
+  private Uri unknownLengthUri;
+
+  private byte[] simpleData;
+  private byte[] unknownLengthData;
+  private FakeDataSet fakeDataSet;
+
+  @Before
+  public void setUp() {
+    simpleUri = Uri.parse("test://simple.test");
+    unknownLengthUri = Uri.parse("test://unknown-length.test");
+    simpleData = TestUtil.buildTestData(/* length= */ 20);
+    unknownLengthData = TestUtil.buildTestData(/* length= */ 40);
+    fakeDataSet =
+        new FakeDataSet()
+            .newData(simpleUri)
+            .appendReadData(simpleData)
+            .endData()
+            .newData(unknownLengthUri)
+            .setSimulateUnknownLength(true)
+            .appendReadData(unknownLengthData)
+            .endData();
+  }
+
+  @Override
+  protected ImmutableList<TestResource> getTestResources() {
+    return ImmutableList.of(
+        new TestResource.Builder()
+            .setName("simple")
+            .setUri(simpleUri)
+            .setExpectedBytes(simpleData)
+            .build(),
+        new TestResource.Builder()
+            .setName("unknown length")
+            .setUri(unknownLengthUri)
+            .setExpectedBytes(unknownLengthData)
+            .build());
+  }
+
+  @Override
+  protected Uri getNotFoundUri() {
+    return Uri.parse("test://not-found.test");
+  }
+
+  @Override
+  protected DataSource createDataSource() {
+    return new FakeDataSource(fakeDataSet);
+  }
+}