public void InputValid_TestValid_WhenCalled(string input, bool valid)
{
// Act
var result = CalculateHelper.InputValid(input);
// Assert
Assert.AreEqual(valid, result);
}
public void InputValid_ThrowError_WhenCalledNullOrEmpty(string input)
{
// Act
Assert.Catch <ArgumentNullException>(() => CalculateHelper.InputValid(input));
}