Back to Basics: Why Unit Testing is Hard 3

why-unit-testing-is-hard-3.cs

[Test]
public void WhenAdding2NumbersAndServiceOnline_SumIsReturnedAndStored()
{
   // Arrange
   IStorageService storageServiceMock = Mocker.Mock <IStorageService>();
   storageServiceMock.Stub(service => service.IsServiceOnline())
          .Return(true);
 
    var calculator = new Calculator(storageServiceMock);   
 
   // Act
   var result = calculator.Add(3, 4);
 
   // Assert
   storageServiceMock.AssertWasCalled(service => service.Store(7);
   Assert.Equals(7, result);
}