@Test
 public void courseIdNotANumber() throws TmcCoreException {
   settings.setCurrentCourse(
       new TmcJsonParser(settings).getCourseFromString(ExampleJson.courseExample));
   DownloadExercises de = new DownloadExercises(new ArrayList<Exercise>(), settings);
   de.checkData();
 }
 @Test(expected = TmcCoreException.class)
 public void settingsWithoutCredentials() throws TmcCoreException {
   CoreTestSettings localSettings = new CoreTestSettings();
   localSettings.setCurrentCourse(
       new TmcJsonParser(settings).getCourseFromString(ExampleJson.courseExample));
   DownloadExercises de = new DownloadExercises(new ArrayList<Exercise>(), localSettings);
   de.checkData();
 }
 @Test(expected = TmcCoreException.class)
 public void settingsWithoutCurrentCourse() throws TmcCoreException {
   DownloadExercises de = new DownloadExercises(new ArrayList<Exercise>(), settings);
   de.checkData();
 }