message: Update test for wrong mime filetype
diff: @@ -334,7 +334,7 @@ describe('Course', () => {
  const res = await chai.request(app)
  .post(`${BASE_URL}/picture/${course._id}`)
  .set('Cookie', `token=${JwtUtils.generateToken(courseAdmin)}`)
  - .attach('file', readFileSync('test/resources/wrong-format.rtf'), 'test.png')
  + .attach('file', readFileSync('test/resources/wrong-format.rtf'), 'test.rtf')
  .field('imageData', JSON.stringify({ breakpoints:
  [ { screenSize: BreakpointSize.MOBILE, imageSize: { width: 284, height: 190} }] }));
  