fix(FEC-7380, FEC-7381): there are captions displayed when the captio…

…ns are supposed to be 'off' (#157)


If the lang comparer receives an empty string as the input lang, it should always returns false (startsWith method will always return true for empty string...)

src/player.js

@@ -299,6 +299,7 @@ export default class Player extends FakeEventTarget {
    * @private
    */
   _repositionCuesTimeout: any;
+
   /**
    * @param {Object} config - The configuration for the player instance.
    * @constructor

src/track/track.js

@@ -15,7 +15,7 @@ export default class Track {
     try {
       inputLang = inputLang.toLowerCase();
       trackLang = trackLang.toLowerCase();
-      return inputLang.startsWith(trackLang) || trackLang.startsWith(inputLang);
+      return inputLang ? (inputLang.startsWith(trackLang) || trackLang.startsWith(inputLang)) : false;
     } catch (e) {
       return false;
     }

test/src/track/track.spec.js

@@ -15,5 +15,9 @@ describe('Track', () => {
       Track.langComparer('es', 'ita').should.be.false;
       Track.langComparer('ita', 'es').should.be.false;
     });
+
+    it('should return false if the input lang is empty', () => {
+      Track.langComparer('', 'rus').should.be.false;
+    });
   });
 });