message: Chg: Use FixtureUtils.getRandomStudentForCourse() for student
diff: @@ -200,7 +200,7 @@ describe('DownloadFile', () => {
  }).timeout(30000);
  it('should pass (student)', async () => {
  const course = await FixtureUtils.getRandomCourseWithAllUnitTypes();
  - const student = await User.findById(course.students[0]);
  + const student = await FixtureUtils.getRandomStudentForCourse(course);
  const testData = await prepareTestData(course);
  const res = await chai.request(app)
  .post(BASE_URL + '/pdf/individual')
  