public void AppendNonNullWithSpaceTest_StringToAddNull() { string stringBefore = "stringBefore"; string stringToAdd = null; string inbetweenText = "inbetweenText"; string expected = "stringBefore"; string result = _helper.AppendNonNullWithSpace(stringBefore, stringToAdd, inbetweenText); Assert.AreEqual(expected, result); Assert.AreSame(stringBefore, result); }