🆕 Add new format to text-to-speech

Add the web format to AudioFormat in text-to-speech, and add the unit
test

text-to-speech/src/main/java/com/ibm/watson/developer_cloud/text_to_speech/v1/model/AudioFormat.java

@@ -32,6 +32,15 @@ public class AudioFormat {
   /** WAV format (value is "audio/wav"). */
   public static final AudioFormat WAV = new AudioFormat(HttpMediaType.AUDIO_WAV);
 
+  /** WAV format (value is "audio/webm"). */
+  public static final AudioFormat WEBM = new AudioFormat(HttpMediaType.AUDIO_WEBM);
+
+  /** WAV format (value is "audio/webm; codecs=vorbis"). */
+  public static final AudioFormat WEBM_VORBIS = new AudioFormat(HttpMediaType.AUDIO_WEBM_VORBIS);
+
+  /** WAV format (value is "audio/webm; codecs=opus"). */
+  public static final AudioFormat WEBM_OPUS = new AudioFormat(HttpMediaType.AUDIO_WEBM_OPUS);
+
   /**
    * Linear 16-bit Pulse-Code Modulation (PCM) format (value is "audio/l16").
    * This format must have a sampling rate set before use, see {@link #getPCM(int)}.

text-to-speech/src/test/java/com/ibm/watson/developer_cloud/text_to_speech/v1/TextToSpeechTest.java

@@ -207,6 +207,34 @@ public void testSynthesize() throws IOException, InterruptedException {
   }
 
 
+  /**
+   * Test synthesize for WebM.
+   *
+   * @throws IOException Signals that an I/O exception has occurred.
+   * @throws InterruptedException the interrupted exception
+   */
+  @SuppressWarnings("resource")
+  @Test
+  public void testSynthesizeWebM() throws IOException, InterruptedException {
+    final File audio = new File("src/test/resources/text_to_speech/sample1.webm");
+    final Buffer buffer = new Buffer().write(Files.toByteArray(audio));
+
+    server.enqueue(new MockResponse().addHeader(CONTENT_TYPE, HttpMediaType.AUDIO_WEBM).setBody(buffer));
+
+    final InputStream in =
+        service.synthesize(text, Voice.EN_LISA, AudioFormat.WEBM).execute();
+    final RecordedRequest request = server.takeRequest();
+    final HttpUrl requestUrl = HttpUrl.parse("http://www.example.com" + request.getPath());
+
+    assertEquals(request.getBody().readUtf8(), "{\"text\":\"" + text + "\"}");
+    assertEquals(SYNTHESIZE_PATH, requestUrl.encodedPath());
+    assertEquals(Voice.EN_LISA.getName(), requestUrl.queryParameter("voice"));
+    assertEquals(HttpMediaType.AUDIO_WEBM, requestUrl.queryParameter("accept"));
+    assertNotNull(in);
+
+    writeInputStreamToOutputStream(in, new FileOutputStream("build/output.webm"));
+  }
+
   /**
    * Test with voice as AudioFormat.WAV.
    */
@@ -223,7 +251,6 @@ public void testWithVoiceAsWav() {
 
   }
 
-
   /**
    * Test the fix wave header not having the size due to be streamed.
    *