@Test
public void addBookmarkToUserAddsBookmark() {

    // given
    // when
    Project actualProject = bookmarkService.addBookmarkToUser(userMock, projectMock);
    // then
    assertThat(actualProject).isEqualTo(projectMock);
    verify(userMock).addBookmark(projectMock);
    verify(userRepository).save(userMock);
}