Remove an invalid test

Author: jeromewu

tests/ffmpeg.test.js

@@ -48,16 +48,6 @@ describe('run()', () => {
       }
     }, 500);
   }).timeout(TIMEOUT);
-
-  it('should terminate the run if exit is called', async () => {
-    const ffmpeg = createFFmpeg(OPTIONS);
-    await ffmpeg.load();
-
-    ffmpeg.run('-h').catch(e=> {
-      expect(e).to.be.equal('ffmpeg has exited')
-    });
-    expect(ffmpeg.exit()).to.throw();
-  }).timeout(TIMEOUT);
 });
 
 describe('FS()', () => {