MBS-10621: Use constants for default endpoints in googlesynthesize tool

Author: Snl-FGH

tools/googlesynthesize/classes/connector.php

@@ -35,9 +35,11 @@
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 class connector extends \local_ai_manager\base_connector {
+    public const DEFAULT_GOOGLE_SYNTHESIZE_ENDPOINT = 'https://texttospeech.googleapis.com/v1/text:synthesize';
+
     #[\Override]
     protected function get_endpoint_url(): string {
-        return $this->instance->get_endpoint() ?: 'https://texttospeech.googleapis.com/v1/text:synthesize';
+        return $this->instance->get_endpoint() ?: self::DEFAULT_GOOGLE_SYNTHESIZE_ENDPOINT;
     }
 
     #[\Override]

tools/googlesynthesize/classes/instance.php

@@ -31,7 +31,7 @@
 class instance extends base_instance {
     #[\Override]
     protected function extend_form_definition(\MoodleQuickForm $mform): void {
-        $defaultendpoint = 'https://texttospeech.googleapis.com/v1/text:synthesize';
+        $defaultendpoint = connector::DEFAULT_GOOGLE_SYNTHESIZE_ENDPOINT;
         $insertat = $mform->elementExists('useglobalapikey') ? 'useglobalapikey' : 'apikey';
         $mform->insertElementBefore(
             $mform->createElement(

tools/googlesynthesize/tests/connector_test.php

@@ -46,7 +46,7 @@ private function make_connector(string $endpoint): connector {
 
     public function test_get_endpoint_url_returns_default_when_empty(): void {
         $this->assertEquals(
-            'https://texttospeech.googleapis.com/v1/text:synthesize',
+            connector::DEFAULT_GOOGLE_SYNTHESIZE_ENDPOINT,
             $this->call_get_endpoint_url($this->make_connector(''))
         );
     }