public void CalculatorViewModel_DigitButtonPress_WhenLeftOperandIsEnteredAndOperationIsEnteredAndRightOperandIsEntered_ThenDigitButtonUpdatesRightOperandAndDisplay()
{
var leftOperand = "12";
var rightOperand = "6";
var operation = "+";
var button = "8";
var expectedRightOperand = "68";
var expectedDisplay = leftOperand + operation + expectedRightOperand;
// Arrange
var mockCalcModel = new Mock <ICalculatorModel>();
mockCalcModel.SetupAllProperties();
mockCalcModel.Object.LeftOperand = leftOperand;
mockCalcModel.Object.RightOperand = rightOperand;
mockCalcModel.Object.Operation = operation;
var calculatorViewModel = new CalculatorViewModel(mockCalcModel.Object);
// Act
calculatorViewModel.DigitButtonPress(button);
//Assert
Assert.AreEqual(leftOperand, calculatorViewModel.LeftOperand);
Assert.AreEqual(expectedDisplay, calculatorViewModel.Display);
Assert.AreEqual(expectedRightOperand, calculatorViewModel.RightOperand);
Assert.AreEqual(operation, calculatorViewModel.Operation);
}
public void CalculatorViewModel_DigitButtonPress_WhenOperationIsEnteredAndRightOperandIsEnteredAndBackspaceIsPressed_ThenRightOperandIsUpdated()
{
var leftOperand = "23";
var operation = "*";
var rightOperand = "456";
var leftOperandAfterPress = "23";
var rightOperandAfterPress = "45";
var expectedDisplay = "23*45";
var button = "BACKSPACE";
// Arrange
var mockCalcModel = new Mock <ICalculatorModel>();
mockCalcModel.SetupAllProperties();
mockCalcModel.Object.LeftOperand = leftOperand;
mockCalcModel.Object.RightOperand = rightOperand;
mockCalcModel.Object.Operation = operation;
var calculatorViewModel = new CalculatorViewModel(mockCalcModel.Object);
// Act
calculatorViewModel.DigitButtonPress(button);
//Assert
Assert.AreEqual(leftOperandAfterPress, calculatorViewModel.LeftOperand);
Assert.AreEqual(expectedDisplay, calculatorViewModel.Display);
Assert.AreEqual(rightOperandAfterPress, calculatorViewModel.RightOperand);
Assert.AreEqual(operation, calculatorViewModel.Operation);
}
public void CalculatorViewModel_DigitButtonPress_WhenNothingIsEntered_ThenDigitButtonUpdatesLeftOperandAndDisplay()
{
var button = "2";
// Arrange
var mockCalcModel = new Mock <ICalculatorModel>();
mockCalcModel.SetupAllProperties();
mockCalcModel.Object.LeftOperand = string.Empty;
mockCalcModel.Object.RightOperand = string.Empty;
mockCalcModel.Object.Operation = string.Empty;
var calculatorViewModel = new CalculatorViewModel(mockCalcModel.Object);
// Act
calculatorViewModel.DigitButtonPress(button);
//Assert
Assert.AreEqual(button, calculatorViewModel.LeftOperand);
Assert.AreEqual(button, calculatorViewModel.Display);
Assert.AreEqual(string.Empty, calculatorViewModel.RightOperand);
Assert.AreEqual(string.Empty, calculatorViewModel.Operation);
}
public void CalculatorViewModel_DigitButtonPress_WhenClearIsPressed_ThenOperandsAndOperationAreResetAndZeroIsDisplay()
{
var leftOperand = "13";
var operation = "+";
var rightOperand = "7";
var expectedDisplay = "0";
var button = "CLEAR";
// Arrange
var mockCalcModel = new Mock <ICalculatorModel>();
mockCalcModel.SetupAllProperties();
mockCalcModel.Object.LeftOperand = leftOperand;
mockCalcModel.Object.RightOperand = rightOperand;
mockCalcModel.Object.Operation = operation;
var calculatorViewModel = new CalculatorViewModel(mockCalcModel.Object);
// Act
calculatorViewModel.DigitButtonPress(button);
//Assert
Assert.AreEqual(string.Empty, calculatorViewModel.LeftOperand);
Assert.AreEqual(expectedDisplay, calculatorViewModel.Display);
Assert.AreEqual(string.Empty, calculatorViewModel.RightOperand);
Assert.AreEqual(string.Empty, calculatorViewModel.Operation);
}