public void CalculatorStartsOffShowingZero()
{
// Make a new calculator controller
// Check that GetOutput() is equal to "0"
DirkGentlyCalculatorController calc1 = new DirkGentlyCalculatorController();
// The two following lines are equivalent. One uses the "constraints" model, and one uses the "static test assertions" model.
Assert.That(calc1.GetOutput(), Is.EqualTo("0")); // Google "NUnit constraints"
Assert.AreEqual(calc1.GetOutput(), "0"); // Google "NUnit static test assertions"
// In this class, we will prefer the constraints-based approach, as it reads more like English and gives more detailed
// and precise failure messages.
// It also avoids the ambiguity as to which parameters is the "expected" result and which is the "actual" result.
}
public void CalculatorClearButtonResetsValueToZero()
{
// Make a new calculator controller
// Enter a non-zero number
// Click the clear button
// Assert GetOutput() is equal to "0"
DirkGentlyCalculatorController calc1 = new DirkGentlyCalculatorController();
calc1.AcceptCharacter('1');
Assert.That(calc1.GetOutput(), Is.EqualTo("1"));
calc1.AcceptCharacter('2');
Assert.That(calc1.GetOutput(), Is.EqualTo("12"));
calc1.AcceptCharacter('c');
Assert.That(calc1.GetOutput(), Is.EqualTo("0"));
}