The Ultimate Guide to Unit Testing in JavaScript.
A Thread...
"A unit test should test the behavior of a unit of work."
Unit tests are isolated and independent of each other.
- Any given behavior should be specified in one and only one test
- The execution/order of execution of one test cannot affect the others
- Repeatable
- Fast
"Ultimate Guidelines Which Helped Me a Lot."
- Whenever possible, use TDD
- Structure your tests properly
- Name your tests properly
- Don't comment out tests
- Avoid logic in your tests
- Don't write unnecessary expectations
- Know your testing framework API
- Consider using factory functions in the tests
- Don't test multiple concerns in the same test
- Cover the general case and the edge cases
- Test the behavior, not the internal implementation
- Don't mock everything
- Create new tests for every defect
- Test simple actions
- Review test code first
- When applying TDD, always start by writing the simplest failing test
- When applying TDD, always make small steps in each test-first cycle
- Properly set up the actions that apply to all the tests involved
Remember "Unit tests are code too"
