Back to Basics: Why Unit Testing is Hard 6

why-unit-testing-is-hard-6.cs

[Test]
public void When3AddsThenGetHistory_ShouldReturnOnlyThose3Results()
{
   // Arrange   
   IStorageService storageServiceMock = Mocker.Mock <IStorageService>();
   storageServiceMock.Stub(service => service.IsServiceOnline())
          .Return(true);
   storageServiceMock.Stub(service => service.GetHistorySession(1))
          .Return(new List <int>{4, 7, 9});
   var calculator = new Calculator(storageServiceMock);
 
 
   calculator.Add(1, 3);
   calculator.Add(2, 5);
   calculator.Add(3, 6);
 
   // Act
   var result = calculator.GetHistory();
 
   // Assert
   storageServiceMock.AssertWasCalled(service => 
              service.GetHistorySession(1);
   Assert.Equal(4, result[0]);
   Assert.Equal(7, resut[1]);
   Assert.Equal(9, result[2]);
   Assert.Equal(3, result.Count);
}