public static void Ctor_Tests()
{
string[] anArray = new string[] { "one", "two", "three", "four", "five" };
ReadOnlyObservableCollection <string> readOnlyCol =
new ReadOnlyObservableCollection <string>(new ObservableCollection <string>(anArray));
IReadOnlyList_T_Test <string> helper = new IReadOnlyList_T_Test <string>(readOnlyCol, anArray);
helper.InitialItems_Tests();
IList <string> readOnlyColAsIList = readOnlyCol;
Assert.True(readOnlyColAsIList.IsReadOnly, "ReadOnlyObservableCollection should be readOnly.");
}