Add contract test for DataSchemeDataSource

PiperOrigin-RevId: 352558063

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

+/*
+ * Copyright (C) 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.upstream;
+
+import static java.nio.charset.StandardCharsets.UTF_8;
+
+import android.net.Uri;
+import android.util.Base64;
+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.util.Random;
+import org.junit.runner.RunWith;
+
+/** {@link DataSource} contract tests for {@link ByteArrayDataSource}. */
+@RunWith(AndroidJUnit4.class)
+public class DataSchemeDataSourceContractTest extends DataSourceContractTest {
+
+  private static final String DATA = TestUtil.buildTestString(20, new Random(0));
+  private static final String BASE64_ENCODED_DATA =
+      Base64.encodeToString(TestUtil.buildTestData(20), Base64.DEFAULT);
+
+  @Override
+  protected ImmutableList<TestResource> getTestResources() {
+    return ImmutableList.of(
+        new TestResource.Builder()
+            .setName("plain text")
+            .setUri(Uri.parse("data:text/plain," + DATA))
+            .setExpectedBytes(DATA.getBytes(UTF_8))
+            .build(),
+        new TestResource.Builder()
+            .setName("base64 encoded text")
+            .setUri(Uri.parse("data:text/plain;base64," + BASE64_ENCODED_DATA))
+            .setExpectedBytes(Base64.decode(BASE64_ENCODED_DATA, Base64.DEFAULT))
+            .build());
+  }
+
+  @Override
+  protected Uri getNotFoundUri() {
+    return Uri.parse("data:");
+  }
+
+  @Override
+  protected DataSource createDataSource() {
+    return new DataSchemeDataSource();
+  }
+}

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

@@ -89,19 +89,18 @@ public class TestUtil {
   }
 
   /**
-   * Generates a random string with the specified maximum length.
+   * Generates a random string with the specified length.
    *
-   * @param maximumLength The maximum length of the string.
+   * @param length The length of the string.
    * @param random A source of randomness.
    * @return The generated string.
    */
-  public static String buildTestString(int maximumLength, Random random) {
-    int length = random.nextInt(maximumLength);
-    StringBuilder builder = new StringBuilder(length);
+  public static String buildTestString(int length, Random random) {
+    char[] chars = new char[length];
     for (int i = 0; i < length; i++) {
-      builder.append((char) random.nextInt());
+      chars[i] = (char) random.nextInt();
     }
-    return builder.toString();
+    return new String(chars);
   }
 
   /**