public void should_be_dirty()
 {
     manager.IsDirty().ShouldBeTrue();
 }
 public void is_dirty_is_false_in_the_inital_state()
 {
     manager.IsDirty().ShouldBeFalse();
 }
 public void the_test_is_no_longer_dirty()
 {
     manager.IsDirty().ShouldBeFalse();
 }