@Test
public void getBookmark() {

    when(academyRepository.getBookmarkedCourses()).thenReturn(DataDummy.generateDummyCourses());
    List<CourseEntity> courseEntities = viewModel.getBookmarks();
    verify(academyRepository).getBookmarkedCourses();
    assertNotNull(courseEntities);
    assertEquals(5, courseEntities.size());
}