public void ObservableWrappedCollection_ConstructorFailTest()
 {
     var collection = new ObservableWrappedCollection <int, int>(null, null);
 }
 public void TestInitialize()
 {
     _random = new Random(DateTime.Today.Day); // reproducible random sequence generating identical values at the same day.
     _source = new ObservableCollection <string>(_sourceStrings);
     _target = new ObservableWrappedCollection <string, StringWrapper>(_source, (s) => new StringWrapper(s));
 }