public void CalculateResult_WhenDevisionByZero_ThenResultIsCalculationError()
{
// Arrange
var calculatorModel = new CalculatorModel("12", "0", "/");
// Act
calculatorModel.CalculateResult();
// Assert
Assert.AreEqual(string.Empty, calculatorModel.LeftOperand);
Assert.AreEqual(string.Empty, calculatorModel.RightOperand);
Assert.AreEqual(string.Empty, calculatorModel.Operation);
Assert.AreEqual("Calculation Error", calculatorModel.Result);
}
public void CalculateResult_WhenInt32IsExceeded_ThenResultIsCalculationError(string leftOperand, string rightOperand, string operation)
{
// Arrange
var calculatorModel = new CalculatorModel(leftOperand, rightOperand, operation);
// Act
calculatorModel.CalculateResult();
// Assert
Assert.AreEqual(string.Empty, calculatorModel.LeftOperand);
Assert.AreEqual(string.Empty, calculatorModel.RightOperand);
Assert.AreEqual(string.Empty, calculatorModel.Operation);
Assert.AreEqual("Calculation Error", calculatorModel.Result);
}
public void CalculateResult_WhenValidParametersPassed_ThenResultIsCalculatedCorrectly(string leftOperand, string rightOperand, string operation, string expectedResult)
{
// Arrange
var calculatorModel = new CalculatorModel(leftOperand, rightOperand, operation);
// Act
calculatorModel.CalculateResult();
// Assert
Assert.AreEqual(leftOperand, calculatorModel.LeftOperand);
Assert.AreEqual(rightOperand, calculatorModel.RightOperand);
Assert.AreEqual(operation, calculatorModel.Operation);
Assert.AreEqual(expectedResult, calculatorModel.Result);
}
private void OperationButtonClick(string @operator)
{
if (FirstNumber == string.Empty || PreviousOperator == "=")
{
FirstNumber = _display;
PreviousOperator = @operator;
}
else
{
SecondNumber = _display;
Operator = _previousOperator;
_calculator.CalculateResult();
History.Add($"{Math.Round(Convert.ToDouble(FirstNumber), 10)}{Operator}={Math.Round(Convert.ToDouble(Result), 10)}");
PreviousOperator = @operator;
Display = Result;
FirstNumber = _display;
}
_clearDisplay = true;
}
public ActionResult Calculate(CalculatorModel calculator)
{
calculator.CalculateResult();
return(RedirectToAction("Index", calculator));
}
