message: findByIdAndRemove => findByIdAndDelete
diff: @@ -360,7 +360,7 @@ describe('Course', () => {
  resAddCourseImage.body.breakpoints.length.should.be.eq(1);
  // delete picture object without api
  - await Picture.findByIdAndRemove(resAddCourseImage.body._id);
  + await Picture.findByIdAndDelete(resAddCourseImage.body._id);
  const resAddAnotherCourseImage = await chai.request(app)
  .post(`${BASE_URL}/picture/${course._id}`)
  @@ -439,7 +439,7 @@ describe('Course', () => {
  resAddCourseImage.body.breakpoints.length.should.be.eq(1);
  // delete picture object without api
  - await Picture.findByIdAndRemove(resAddCourseImage.body._id);
  + await Picture.findByIdAndDelete(resAddCourseImage.body._id);
  const resDeleteCourseImage = await chai.request(app)
  .del(`${BASE_URL}/picture/${course._id}`)
  