✅ [amp-redbull-player] Add unit tests to increase coverage. (#32904)

Fixes #32902 

This change increases code coverage in `amp-redbull-player` from 41.67% to 63.33%. 
(Measured using the `--coverage` flag with `gulp unit`)

extensions/amp-redbull-player/0.1/test/test-amp-redbull.js

@@ -48,25 +48,69 @@ describes.realWin(
       });
     }
 
-    it('renders the Red Bull player', async () => {
-      const player = await getRedBullElement(
-        'rrn:content:videos:3965a26c-052e-575f-a28b-ded6bee23ee1:en-INT'
-      );
-      const playerIframe = player.querySelector('iframe');
-      expect(playerIframe).to.not.be.null;
-      expect(playerIframe.src).to.equal(
-        'https://player.redbull.com/amp/amp-iframe.html?videoId=' +
-          encodeURIComponent(
-            'rrn:content:videos:3965a26c-052e-575f-a28b-ded6bee23ee1:en-INT'
-          ) +
-          '&skinId=com&ampTagId=rbvideo&locale=global'
-      );
+    describe('rendering', async () => {
+      it('renders the Red Bull player', async () => {
+        const player = await getRedBullElement(
+          'rrn:content:videos:3965a26c-052e-575f-a28b-ded6bee23ee1:en-INT'
+        );
+        const playerIframe = player.querySelector('iframe');
+        expect(playerIframe).to.not.be.null;
+        expect(playerIframe.src).to.equal(
+          'https://player.redbull.com/amp/amp-iframe.html?videoId=' +
+            encodeURIComponent(
+              'rrn:content:videos:3965a26c-052e-575f-a28b-ded6bee23ee1:en-INT'
+            ) +
+            '&skinId=com&ampTagId=rbvideo&locale=global'
+        );
+      });
+
+      it('fails without videoId', () => {
+        return getRedBullElement(null).should.eventually.be.rejectedWith(
+          /The data-param-videoid attribute is required/
+        );
+      });
+
+      it('removes iframe after unlayoutCallback', async () => {
+        const player = await getRedBullElement(
+          'rrn:content:videos:3965a26c-052e-575f-a28b-ded6bee23ee1:en-INT'
+        );
+        const playerIframe = player.querySelector('iframe');
+        expect(playerIframe).to.not.be.null;
+
+        const impl = await player.getImpl(false);
+        impl.unlayoutCallback();
+        expect(player.querySelector('iframe')).to.be.null;
+        expect(impl.iframe_).to.be.null;
+      });
     });
+    describe('methods', async () => {
+      let impl;
+      beforeEach(async () => {
+        const player = await getRedBullElement(
+          'rrn:content:videos:3965a26c-052e-575f-a28b-ded6bee23ee1:en-INT'
+        );
+        impl = await player.getImpl(false);
+      });
+
+      it('is interactive', () => {
+        expect(impl.isInteractive()).to.be.true;
+      });
+
+      it('supports platform', () => {
+        expect(impl.supportsPlatform()).to.be.true;
+      });
+
+      it('does not pre-implement MediaSession API', () => {
+        expect(impl.preimplementsMediaSessionAPI()).to.be.false;
+      });
+
+      it('does not pre-implement auto-fullscreen', () => {
+        expect(impl.preimplementsAutoFullscreen()).to.be.false;
+      });
 
-    it('fails without videoId', () => {
-      return getRedBullElement(null).should.eventually.be.rejectedWith(
-        /The data-param-videoid attribute is required/
-      );
+      it('is not fullscreen', () => {
+        expect(impl.isFullscreen()).to.be.false;
+      });
     });
   }
 );