Testing Guidelines

Test Naming

• Test names should not include the word "test"

Assertions

• Test assertions should be strict
  • Bad: expect(content).to.include('valid-content')
  • Better: expect(content).to.equal({ key: 'valid-content' })
  • Best: expect(content).to.deep.equal({ key: 'valid-content' })

Mocking

• Use mocking as a last resort
  • Don't mock a database, if it's possible to use an in-memory fake implementation instead
  • Don't mock a larger API if we can mock a smaller API that it delegates to
  • Prefer frameworks that record/replay network traffic over mocking
  • Don't mock our own code
• Don't overuse the word "mock"
  • Mocking means replacing behavior, by replacing method or function bodies, using a mocking framework
  • In other cases use the words "fake" or "example"