feat: Add Google comprehensive test suite and google:style tag support

- Created comprehensive test suite for Google Cloud TTS with 17 tests

- Added support for google:style tag

- Maps to google:style SSML tag

- No namespace declaration needed per Google documentation

- 16 tests passing, 1 skipped (voice sections not yet supported)

- All 702 existing tests still passing

Author: willwade

google-ssml-examples.txt

@@ -0,0 +1,74 @@
+Full
+
+<speak>
+  Here are <say-as interpret-as="characters">SSML</say-as> samples.
+  I can pause <break time="3s"/>.
+  I can play a sound
+  <audio src="https://www.example.com/MY_MP3_FILE.mp3">didn't get your MP3 audio file</audio>.
+  I can speak in cardinals. Your number is <say-as interpret-as="cardinal">10</say-as>.
+  Or I can speak in ordinals. You are <say-as interpret-as="ordinal">10</say-as> in line.
+  Or I can even speak in digits. The digits for ten are <say-as interpret-as="characters">10</say-as>.
+  I can also substitute phrases, like the <sub alias="World Wide Web Consortium">W3C</sub>.
+  Finally, I can speak a paragraph with two sentences.
+</speak>
+
+
+dates
+
+<speak>
+  <say-as interpret-as="date" format="yyyymmdd" detail="1">
+    1960-09-10
+  </say-as>
+</speak>
+
+expletive
+
+<speak>
+  <say-as interpret-as="expletive">censor this</say-as>
+</speak>
+
+Audio attachment
+
+<speak>
+  <audio src="cat_purr_close.ogg">
+    <desc>a cat purring</desc>
+    PURR (sound didn't load)
+  </audio>
+</speak>
+
+Marks
+
+<speak>
+Go from <mark name="here"/> here, to <mark name="there"/> there!
+</speak>
+
+
+Prosody
+
+<prosody rate="slow" pitch="-2st">Can you hear me now?</prosody>
+
+Emphasis
+
+<emphasis level="moderate">This is an important announcement</emphasis>
+
+
+IPA
+
+  <phoneme alphabet="ipa" ph="ˌmænɪˈtoʊbə">manitoba</phoneme>
+  <phoneme alphabet="x-sampa" ph='m@"hA:g@%ni:'>mahogany</phoneme>
+  
+
+Voice tags
+
+<speak>And then she asked, <voice language="fr-FR" gender="female">qu'est-ce qui
+t'amène ici</voice><break time="250ms"/> in her sweet and gentle voice.</speak>
+
+Langs in a speak
+
+
+<speak>The french word for cat is <lang xml:lang="fr-FR">chat</lang></speak>
+
+
+Style
+
+<speak><google:style name="lively">Hello I'm so happy today!</google:style></speak>

src/formatters/GoogleAssistantSsmlFormatter.ts

@@ -11,6 +11,8 @@ export class GoogleAssistantSsmlFormatter extends SsmlFormatterBase {
     this.modifierKeyToSsmlTagMappings.interjection = null;
     this.modifierKeyToSsmlTagMappings.whisper = 'prosody';
     this.modifierKeyToSsmlTagMappings.lang = 'lang';
+    // Map style modifier to google:style tag
+    this.modifierKeyToSsmlTagMappings.style = 'google:style';
   }
 
   // tslint:disable-next-line: max-func-body-length
@@ -98,6 +100,10 @@ export class GoogleAssistantSsmlFormatter extends SsmlFormatterBase {
               textModifierObject.voiceTag(key, value);
               break;
 
+            case 'style':
+              textModifierObject.tag(ssmlTag, { name: value });
+              break;
+
             default: {
             }
           }

test-google-style-check.js

@@ -0,0 +1,22 @@
+const { SpeechMarkdown } = require('./dist/src/SpeechMarkdown.js');
+
+const speech = new SpeechMarkdown();
+
+console.log('=== Test Google Style (no namespace) ===');
+const markdown = `(Hello I'm so happy today!)[style:"lively"]`;
+const ssml = speech.toSSML(markdown, { platform: 'google-assistant' });
+console.log(JSON.stringify(ssml));
+console.log(ssml);
+
+// Check that namespace is NOT present
+if (ssml.includes('xmlns:google')) {
+  console.log('\n✗ ERROR: Google namespace found (should not be there)');
+} else {
+  console.log('\n✓ Correct: No namespace in speak tag');
+}
+
+if (ssml.includes('<google:style name="lively">')) {
+  console.log('✓ google:style tag found!');
+} else {
+  console.log('✗ google:style tag NOT found');
+}