public void TestThrowIfNegativeWithoutFieldName([Values(-1)] int value)
{
ArgumentOutOfRangeException ex = Assert.Throws <ArgumentOutOfRangeException>(() => ValidationUtil.ThrowIfNegative(value, null));
Assert.NotNull(ex);
Assert.True(ex.Message.StartsWith("Cannot be negative."));
Assert.AreEqual(string.Empty, ex.ParamName);
}