public void EnteringSeveralDigitsDisplaysTheWholeNumber()
{
sut = sut.EnterDigit('2');
sut = sut.EnterDigit('3');
Assert.AreEqual("23", sut.Display);
}
public void EnteringTheEqualSignDisplaysTheResult()
{
sut = sut.EnterDigit('3');
sut = sut.EnterDigit('3');
sut = sut.EnterEqual();
Assert.AreEqual("55", sut.Display);
}
public void EnteringANewOperatorFollowedByADigitDisplaysTheDigit()
{
sut = sut.EnterDigit('3');
sut = sut.EnterDigit('3');
sut = sut.EnterOperator(new PlusOperator());
sut = sut.EnterDigit('2');
Assert.AreEqual("2", sut.Display);
}
public void FurtherOperatorsExecuteThePreviousCalculation()
{
sut = sut.EnterDigit('3');
sut = sut.EnterDigit('3');
sut = sut.EnterOperator(new PlusOperator());
sut = sut.EnterDigit('2');
sut = sut.EnterDigit('2');
sut = sut.EnterEqual();
Assert.AreEqual("77", sut.Display);
}
public void EnteringADigitDisplaysThatDigit()
{
sut = sut.EnterDigit('2');
Assert.AreEqual("2", sut.Display);
}