test(utils): Add comprehensive unit tests for format-utils module (#86)

- Added tests for `DateFormatter` methods:
  - `constructor` with valid and invalid inputs
  - `fromMicroseconds` with valid and invalid inputs
  - `toMicroseconds` and `micros` methods
  - `toMilliseconds` and `millis` methods
  - `toISOString` and `toISO` methods
  - `toDateObject` method
  - `toString` method
  - `toLocaleString` method with various locales
- Added tests for `FormatUtils` methods:
  - `parseFormatObject` with valid and invalid inputs
  - `sortThumbnailsByResolution` with valid and invalid inputs
  - `getAuthorThumbnails` with various scenarios
  - `getVideoThumbnails` with various scenarios
  - `getAllThumbnails` with various scenarios
  - `getThumbnailByResolution` with various scenarios
  - `getThumbnail` with various scenarios
  - `hasVideo` with formats containing and not containing video
  - `hasAudio` with formats containing and not containing audio
- Added several assets for these unit tests to test various scenarios:
  - `test/assets/json/formats.json`
  - `test/assets/json/videoThumbnails.json`
  - `test/assets/json/authorThumbnails.json`

Authored-by: Ryuu Mitsuki <[email protected]>

Author: mitsuki31

test/assets/json/authorThumbnails.json

@@ -0,0 +1,17 @@
+[
+  {
+    "url": "https://yt3.ggpht.com/EXAMPLE=s48-c-k-c0x00ffffff-no-rj",
+    "width": 48,
+    "height": 48
+  },
+  {
+    "url": "https://yt3.ggpht.com/EXAMPLE=s88-c-k-c0x00ffffff-no-rj",
+    "width": 88,
+    "height": 88
+  },
+  {
+    "url": "https://yt3.ggpht.com/EXAMPLE=s176-c-k-c0x00ffffff-no-rj",
+    "width": 176,
+    "height": 176
+  }
+]

test/assets/json/formats.json

@@ -0,0 +1,95 @@
+{
+  "audioonly": {
+    "mimeType": "audio/mp4; codecs=\"mp4a.40.2\"",
+    "qualityLabel": null,
+    "bitrate": 131110,
+    "audioBitrate": 128,
+    "itag": 140,
+    "url": "https://example.com/videoplayback?audio-only",
+    "initRange": {
+      "start": "0",
+      "end": "667"
+    },
+    "indexRange": {
+      "start": "668",
+      "end": "1023"
+    },
+    "lastModified": "1649941229498837",
+    "contentLength": "4317886",
+    "quality": "tiny",
+    "projectionType": "RECTANGULAR",
+    "averageBitrate": 129556,
+    "highReplication": true,
+    "audioQuality": "AUDIO_QUALITY_MEDIUM",
+    "approxDurationMs": "266626",
+    "audioSampleRate": "44100",
+    "audioChannels": 2,
+    "loudnessDb": 7.81,
+    "hasVideo": false,
+    "hasAudio": true,
+    "container": "mp4",
+    "codecs": "mp4a.40.2",
+    "videoCodec": null,
+    "audioCodec": "mp4a.40.2",
+    "isLive": false,
+    "isHLS": false,
+    "isDashMPD": false
+  },
+  "videoonly": {
+    "mimeType": "video/webm; codecs=\"vp9\"",
+    "qualityLabel": "1080p",
+    "bitrate": 2764193,
+    "itag": 137,
+    "url": "https://example.com/videoplayback?video-only",
+    "initRange": {
+      "start": "0",
+      "end": "239"
+    },
+    "indexRange": {
+      "start": "240",
+      "end": "500"
+    },
+    "lastModified": "1649941229498837",
+    "contentLength": "108642789",
+    "quality": "hd1080",
+    "projectionType": "RECTANGULAR",
+    "averageBitrate": 2764173,
+    "highReplication": false,
+    "approxDurationMs": "266626",
+    "hasVideo": true,
+    "hasAudio": false,
+    "container": "webm",
+    "codecs": "vp9",
+    "videoCodec": "vp9",
+    "audioCodec": null,
+    "isLive": false,
+    "isHLS": false,
+    "isDashMPD": false
+  },
+  "combined": {
+    "mimeType": "video/mp4; codecs=\"avc1.640028, mp4a.40.2\"",
+    "qualityLabel": "720p",
+    "bitrate": 1581508,
+    "itag": 22,
+    "url": "https://example.com/videoplayback?combined",
+    "lastModified": "1649941229498837",
+    "contentLength": "5400000",
+    "quality": "hd720",
+    "projectionType": "RECTANGULAR",
+    "averageBitrate": 1575000,
+    "audioQuality": "AUDIO_QUALITY_MEDIUM",
+    "approxDurationMs": "266626",
+    "audioSampleRate": "44100",
+    "audioChannels": 2,
+    "loudnessDb": 5.43,
+    "hasVideo": true,
+    "hasAudio": true,
+    "container": "mp4",
+    "codecs": "avc1.640028, mp4a.40.2",
+    "videoCodec": "avc1.640028",
+    "audioCodec": "mp4a.40.2",
+    "isLive": false,
+    "isHLS": false,
+    "isDashMPD": false
+  }
+}

test/assets/json/videoThumbnails.json

@@ -0,0 +1,22 @@
+[
+  {
+    "url": "https://i.ytimg.com/vi/VIDEO_ID/hqdefault.jpg",
+    "width": 168,
+    "height": 94
+  },
+  {
+    "url": "https://i.ytimg.com/vi/VIDEO_ID/mqdefault.jpg",
+    "width": 320,
+    "height": 180
+  },
+  {
+    "url": "https://i.ytimg.com/vi/VIDEO_ID/sddefault.jpg",
+    "width": 640,
+    "height": 480
+  },
+  {
+    "url": "https://i.ytimg.com/vi/VIDEO_ID/maxresdefault.jpg",
+    "width": 1280,
+    "height": 720
+  }
+]