2. Starting Test Driven Development with Mock objects Dror Helper Software Developer Typemock

3. Sounds familiar? Every ten bugs I fix I create a new one… I have no idea what caused that issue… I’d rather not change that function… It is impossible to Unit Test our project! Setting my test environment takes too long

4. Agenda Unit testing Introducing Test Driven Development Code new feature using TDD Writing unit tests using Isolation

5. Unit Tests Test specific functionality Clear pass/fail criteria Good unit test runs in isolation

6. What is a Unit Test [TestMethod] public void CheckPassword_ValidUser_ReturnTrue() { bool result = CheckPassword(“user”, “pass”); Assert.IsTrue(result); }

7. Test Driven Development Design your code by writing tests first

8. The Demo Project - UserAdmin Create function that saves new user:

9. The Demo Project –Tests Step 1 Check that name is not empty Check that email is not empty Check if user already in our database

10. Verify new user details Dror Helper Software Developer Typemock Demo

11. What is Isolation/Mocking Replace production logic with custom logic We do this in order to Focus the test on one class only Test interaction between components Break dependencies Simplify unit test writing

12. Set Behavior Return custom values Throw exceptions Ignore calls Run custom action when called

13. The Demo Project –Step 2 Check if user already in our database

14. Setting behavior Dror Helper Software Developer Typemock Demo

15. Create fake objects Create hard-to-instantiate classes Fake objects and pass them to code Replace future objects*

16. Verify method Calls Method was called Method was not called Check the call’s arguments

17. The Demo Project –Step 3 If all conditions are met – no exception Confirmation sent to user User saved

18. Creating fake objectsand Verifying method calls Dror Helper Software Developer Typemock Demo

19. Summary Unit tests Test Driven Development Isolation frameworks

20. Questions & Answers

21. Want to learn more? Start using TDD in your project today! Read about TDD & Isolation on Typemock Insiders blog - blog.typemock.com Follow us on twitter.com/Typemock

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