test: SNI-6952 add so_auto transformation to cldPoster

Author: pawelphilipczyk-cloudinary

packages/react/__tests__/AdvancedVideo.test.tsx

@@ -85,7 +85,7 @@ describe('AdvancedVideo', () => {
     const component = mount(<AdvancedVideo cldVid={cloudinaryVideo} cldPoster="auto" />);
 
     setTimeout(() => {
-      expect(component.html()).toContain('poster="https://res.cloudinary.com/demo/video/upload/q_auto/f_jpg/sample"');
+      expect(component.html()).toContain('poster="https://res.cloudinary.com/demo/video/upload/q_auto/f_jpg/so_auto/sample"');
       done();
     }, 0);// one tick
   });

packages/react/src/AdvancedVideo.tsx

@@ -118,7 +118,11 @@ class AdvancedVideo extends Component <VideoProps> {
       }
     })
     if (this.props.cldPoster === 'auto') {
-      result['poster'] = this.props.cldVid.quality("auto").format("jpg").toURL();
+      result['poster'] = this.props.cldVid
+        .quality('auto')
+        .format('jpg')
+        .addTransformation('so_auto')
+        .toURL()
     } else if (this.props.cldPoster instanceof CloudinaryImage) {
       result['poster'] = this.props.cldPoster.toURL();
     }