TDD

Question 1

In TDD, what is a Dummy?

Answer 1

They are simple mocks that represent external resources. They usual return the same result regardless of input parameters or number of times called

Question 2

In TDD, what are Stubs/Fakes?

Answer 2

Similar to Dummy objects, but they will return a different result depending on the input parameters, however they still have no ‘knowledge’ of how many times they’ve been called

Question 3

In TDD, what are Mocks?

Answer 3

They are a step up from Stubs/Fakes. Not only do they return different results depending on the input, they also have rules defining how often and when methods should be called

Question 4

What types of methods should you NOT mock?

Answer 4

Private Methods

Question 5

Convert the following function so that it’s Mocked to allow any integer value when called and always return 10 in a test: class MyClass() { public int WhatIsTheSquareOf(int x) { return x*x;} }

Answer 5

private Mock _myClass; _myClass.Setup(x => x.WhatIsTheSquareOf(It.IsAny()).Returns(10);

Question 6

When you find / are told of a bug, what should be the first thing you do?

Answer 6

Write a unit test to ‘prove’ the bug. You’re fix should then stop the text from failing.

Question 7

What are the 3 stages of a Unit Test?

Answer 7

Arrange

Act

Assert