Improve util tests

Add test case for `Util.processYoutubeVideoTitle` function.
Bind functions to Util module before testing. This allows to use `this` keyword in Util module.

src/core/content/util.js

@@ -39,7 +39,7 @@ const Util = {
 		let [artist, track] = [null, null];
 
 		// Try to match one of the regexps
-		for (let regExp of Util.youtubeTitleRegExps) {
+		for (let regExp of this.youtubeTitleRegExps) {
 			let artistTrack = title.match(regExp.pattern);
 			if (artistTrack) {
 				artist = artistTrack[regExp.groups.artist];
@@ -49,11 +49,11 @@ const Util = {
 		}
 
 		// No match? Try splitting, then.
-		if (Util.isArtistTrackEmpty({ artist, track })) {
+		if (this.isArtistTrackEmpty({ artist, track })) {
 			({ artist, track } = this.splitArtistTrack(title));
 		}
 
-		if (Util.isArtistTrackEmpty({ artist, track })) {
+		if (this.isArtistTrackEmpty({ artist, track })) {
 			track = title;
 		}
 
@@ -70,7 +70,7 @@ const Util = {
 			return null;
 		}
 
-		let match = videoUrl.match(Util.videoIdRegExp);
+		let match = videoUrl.match(this.videoIdRegExp);
 		if (match) {
 			return match[7];
 		}

tests/content/util.js

@@ -203,6 +203,10 @@ const PROCESS_YOUTUBE_TITLE_DATA = [{
 	description: 'should process tracks with seperators without leading whitespace and quotes',
 	source: 'Artist: "Track Name"',
 	expected: { artist: 'Artist', track: 'Track Name' }
+}, {
+	description: 'should use title as track title',
+	source: 'Track Name',
+	expected: { artist: null, track: 'Track Name' }
 }];
 
 /**
@@ -355,9 +359,11 @@ function testIsArtistTrackEmpty() {
  * @param  {Array} testData Array of test data
  */
 function testFunction(func, testData) {
+	const boundFunc = func.bind(Util);
+
 	for (let data of testData) {
 		let { description, source, expected } = data;
-		let actual = func(source);
+		let actual = boundFunc(source);
 
 		it(description, function() {
 			expect(actual).to.be.equal(expected);