1. Unit Testing
the regression shield

2. Unit Testing, Node.JS style
What is unit testing
“What to test”, not “how to test”
Vows, NodeMock, and CommonSense™

3. Vows
Use vows properly
Run the test suite runner BEFORE pull requests
Check confessions server AFTER pull request
integration

4. Test Suite Runner
$ bin/fo test
$ bin/fo test -v (verbose)
$ bin/fo --help (kills nyancats)
Test it out...

5. Writing a test case
Config Object
Goal:
Load contents from a config file
Parse contents and return as a JSON string
Should handle errors gracefully
See wiki/testing-example1-basic

6. Writing a test case
What’s the problem here?
1 - Depends on files
2 - Hard to setup test environment
3 - It’s NOT unit testing

7. Mocks
Control Environment
Run It Anywhere™
Mock objects to the rescue!
See wiki/testing-example2-mock

8. NodeMock
https://github.com/arunoda/nodemock
Mocking solution made easy
No need to rewrite code for every single test
context
See wiki/testing-example3-nodemock

9. NodeMock
Mocking objects in test cases are messy
How to re-use mock objects
When to re-use mock objects
When NOT to re-use mock objects

10. Fixtures
Control environment
“Clean Slate” to run tests on
No external dependencies
Injects dependencies
Used in manufacturing’s testing procedures
See wiki/testing-example4-fixtures

11. Dependency Injection
WTF is DI?
Inject dependency vs Encapsulated dependency
Constructor injection, Getter/setter injection,
Service Locator, Factory & DI Containers
Dependency Injection = Easier to test
Use FO(‘...’) to auto-construct components

12. Code Samples
Config File: http://pastebin.com/N65mt2eh
Simple Test: http://pastebin.com/Df7ysdEH
JSON File: http://pastebin.com/Qbt52Cba
With Mock: http://pastebin.com/G0812kxz
NodeMock: http://pastebin.com/swGR379h
Fixture: http://pastebin.com/f4daFf5Z

13. -Q&A-