public void IDictionaryTests()
{
string n0 = "user type";
var t = new UserTypes();
var ut0 = new UserType(n0, typeof(string), null);
t.Add(n0, ut0);
Assert.Single(t);
Assert.Equal(ut0, t[n0]);
Assert.True(t.ContainsKey(n0));
Assert.True(t.Remove(n0));
Assert.Empty(t);
}