Test Easy and Prosper with Spock Framework

Introduction to what is unit testing and discussion why it is important. Presenting a cool framework for writing unit tests in Groovy that can be used testing any code written in JVM language.

Transcript

1. Test Easy and Prosper with Spock Framework Tomche Delev March 11, 2017 JavaSkop17'
2. Agenda Why bother with unit testing? How to enjoy writing unit tests? Show me the code already!
3. What is unit testing?
4. De nition A unit test is a piece of a code (usually a method) that invokes another piece of code and checks the correctness of some assumptions afterward. If the assumptions turn out to be wrong, the unit test has failed. A "unit" is a method or function.
5. But why? Why Most Unit Testing is Waste (2014)
6. What is the answer of the community?
7. HN Ok let's stop writing UT and see what happens. Wait... we've already tried that, and we know the result pretty well
8. 1. Dynamic languages
9. 2. Documentation
10. 3. Refactoring
11. 4. Rely on human factor
12. 5. On failure the system is equally broken
13. 6. Fear of reusing
14. Did I fail to mention something?
15. UT cannot assert the correctness of your code. But it will constructively assert its incorrectness.
16. SO Is Unit Testing worth the effort?
17. 1. Big changes more quickly
18. 2. When to stop coding
19. 3. The tests and the code work together to achieve better code (TDD).
20. 4. TDD helps with coding constipation.
21. 5. Unit Tests help you really understand the design of the code you are working on.
22. 6. Instant visual feedback.
23. 7. Unit testing does not mean writing twice as much code.
24. 8. Fowler: "Imperfect tests, run frequently, are much better than perfect tests that are never written at all"
25. Unit testing is a lot like going to the gym.
26. Then, after maybe one or two weeks, just as the soreness is going away, a Big Deadline begins approaching.
27. Are you doing something wrong?
28. The nal answer Unit Testing is usually worth the effort BUT the amount of effort required isn't going to be the same for everybody
29. How to enjoy writing unit tests? Spock Framework
30. Spock is: Testing and speci cation framework for Java and Groovy applications With beautiful and highly expressive speci cation language Compatible with most IDEs, build tools, and continuous integration servers Inspired from JUnit, jMock, RSpec, Groovy, Scala, Vulcans, and other fascinating life forms
31. Why Spock? Reduce the lines of test code Make tests more readable Turn tests into speci cations Make testing fun again!
32. Spock in the testing jungle Use Case Conventional Tool(s) A Single Tool Unit Testing JUnit TestNG Spock Mocking and Stubing EasyMock jMock Mockito PowerMock jMockit Behaviour Driven Design (BDD) Cucamber JBehave
33. Comparison to JUnit Concepts JUnit Spock Test class Speci cation Test Feature Test method Feature method @Before setup() @After cleanup() Assertion Condition @Test(expected) Exception condition
34. Hello Spock import spock.lang.Specification class StarshipSpec extends Specification { def "science officer of the starship Enterprise is Spock"() { given: def starship = new Starship("Enterprise", "Spock") when: def actual = starship.getScienceOfficer() then: actual == "Spock" } }
35. State based testing (AAA) Arrange Act Assert BDD Style Given When Then Blocks
36. Basic Blocks Demo https://github.com/tdelev/javaskop17-spock
37. Data Driven Testing Demo https://github.com/tdelev/javaskop17-spock
38. Interaction Based Testing and Mocking Demo https://github.com/tdelev/javaskop17-spock
39. Real world example Demo https://github.com/tdelev/spring-spock
40. Thank you! Questions? Acknowledgment This work was supported by