public void Convert() { var c = new NullableConverter(); Assert.IsNull(c.ConvertBack("", typeof(int?), null, CultureInfo.CurrentCulture)); Assert.AreEqual(1, c.ConvertBack("1", typeof(int?), null, CultureInfo.CurrentCulture)); Assert.AreEqual("", c.Convert(null, typeof(string), null, CultureInfo.CurrentCulture)); Assert.AreEqual("1", c.Convert(1, typeof(string), null, CultureInfo.CurrentCulture)); }