public void IsInRangeShouldThrowIfAnyParameterIsNull() { Comparable @null = null; Comparable instance = new Comparable(); Should.Throw <ArgumentNullException>(() => @null.IsInRange(instance, instance)); Should.Throw <ArgumentNullException>(() => instance.IsInRange(@null, instance)); Should.Throw <ArgumentNullException>(() => instance.IsInRange(instance, @null)); }