public void MusicSelection_MethodSetDifficultyLevel_FieldDifficultyLevel_LowerCaseSetCorrectly()
{
//Arrange
Contributor composer = new Contributor(new Name("David", "", "Haas"), "Composer");
MusicSelectionMock myMusicSelection =
new MusicSelectionMock("9999991e810c19729de860ea", "507f191e810c19729de860ea", "Blest Are They", composer);
//Act
myMusicSelection.setDifficultyLevel(" Hard ");
//Assert
Assert.AreEqual("hard", myMusicSelection.DifficultyLevel_LowerCase);
}