public void GetCompletedLessonsTest_Fails(string userGuid)
{
_resultsService.Setup(x => x.GetUserLessonsByUserGuid(It.IsAny <string>())).Returns((new List <UserLesson>()).AsQueryable());
_resultsService.Setup(x => x.GetUserByGuid(It.IsAny <string>())).Returns((User)null);
var result = _resultsManager.GetCompletedLessons(userGuid);
Assert.True(result != null);
Assert.False(result.Success);
}