151 feat youtube embed iframe (#176)

* youtube embed iframe temp commit

* Fixes styling and code cleanup

* lint

* Now clicking between the pause and settings button doesn't trigger the parent

* use modest branding (less yt logos)

* Stop playing the video once there's a navigation event

* Make sure the iframe is unmounted on any navigation event

* fixes tests

* lint

__tests__/lib/string.test.ts

@@ -1,3 +1,4 @@
+import {getYoutubeVideoId} from './../../src/lib/strings'
 import {
   extractEntities,
   detectLinkables,
@@ -487,3 +488,29 @@ describe('toShareUrl', () => {
     }
   })
 })
+
+describe('getYoutubeVideoId', () => {
+  it(' should return undefined for invalid youtube links', () => {
+    expect(getYoutubeVideoId('')).toBeUndefined()
+    expect(getYoutubeVideoId('https://www.google.com')).toBeUndefined()
+    expect(getYoutubeVideoId('https://www.youtube.com')).toBeUndefined()
+    expect(
+      getYoutubeVideoId('https://www.youtube.com/channelName'),
+    ).toBeUndefined()
+    expect(
+      getYoutubeVideoId('https://www.youtube.com/channel/channelName'),
+    ).toBeUndefined()
+  })
+
+  it('getYoutubeVideoId should return video id for valid youtube links', () => {
+    expect(getYoutubeVideoId('https://www.youtube.com/watch?v=videoId')).toBe(
+      'videoId',
+    )
+    expect(
+      getYoutubeVideoId(
+        'https://www.youtube.com/watch?v=videoId&feature=share',
+      ),
+    ).toBe('videoId')
+    expect(getYoutubeVideoId('https://youtu.be/videoId')).toBe('videoId')
+  })
+})