Test Video Roles Are Not Included in Audio-Language-Role

A change to how we collect the audio-lanugage-role pairs allowed
the video roles to be included.

This change adds a test to make sure that does not happen. It
will fail now and be fixed in a later CL.

Issue #1731

Change-Id: I1178fce70f38ff7b6d9ddabfb73157985f6f63b6

test/player_unit.js

@@ -3343,8 +3343,23 @@ describe('Player', function() {
       });
     });
 
-    describe('get*LanguageAndRoles', function() {
-      it('returns a list of language/role combinations', async () => {
+    describe('getAudioLanguagesAndRoles', () => {
+      it('ignores video roles', async () => {
+        manifest = new shaka.test.ManifestGenerator()
+            .addPeriod(0)
+            .addVariant(0)
+            .addVideo(1).roles(['video-only-role'])
+            .addAudio(2).roles(['audio-only-role']).language('en')
+            .build();
+
+        await player.load(fakeManifestUri, 0, parserFactory);
+
+        expect(player.getAudioLanguagesAndRoles()).toEqual([
+          {language: 'en', role: 'audio-only-role'},
+        ]);
+      });
+
+      it('lists all language-role combinations', async () => {
         await player.load(fakeManifestUri, 0, parserFactory);
         expect(player.getAudioLanguagesAndRoles()).toEqual([
           {language: 'fr', role: ''},
@@ -3353,23 +3368,32 @@ describe('Player', function() {
           {language: 'de', role: 'foo'},
           {language: 'de', role: 'bar'},
         ]);
-        expect(player.getTextLanguagesAndRoles()).toEqual([
-          {language: 'es', role: 'baz'},
-          {language: 'es', role: 'qwerty'},
-          {language: 'en', role: 'main'},
-          {language: 'en', role: 'caption'},
-          {language: 'en', role: 'subtitle'},
-        ]);
       });
 
-      it('returns "und" for video-only tracks', async () => {
-        manifest = videoOnlyManifest;
+      it('uses "und" for video-only tracks', async () => {
+        manifest = new shaka.test.ManifestGenerator()
+            .addPeriod(0)
+            .addVariant(0)
+            .addVideo(1).roles(['video-only-role'])
+            .build();
 
         await player.load(fakeManifestUri, 0, parserFactory);
         expect(player.getAudioLanguagesAndRoles()).toEqual([
           {language: 'und', role: ''},
         ]);
-        expect(player.getTextLanguagesAndRoles()).toEqual([]);
+      });
+    });
+
+    describe('getTextLanguageAndRoles', function() {
+      it('lists all language-role combinations', async () => {
+        await player.load(fakeManifestUri, 0, parserFactory);
+        expect(player.getTextLanguagesAndRoles()).toEqual([
+          {language: 'es', role: 'baz'},
+          {language: 'es', role: 'qwerty'},
+          {language: 'en', role: 'main'},
+          {language: 'en', role: 'caption'},
+          {language: 'en', role: 'subtitle'},
+        ]);
       });
     });
   });