Code testing

• Testing overview
  • Running tests
  • Major test suites
  • Other test suites
  • Internet access inside test suites
    • Documentation tests
• Linters
  • Overview
  • Running the linters
  • General considerations
  • Lint checks
  • lint
    • Special options
    • Lint checks
  • Philosophy
    • Speed
    • Accuracy
    • Completeness
• Backend Django tests
  • Overview
  • Running tests
  • Writing tests
    • Setting up data for tests
    • Testing code that accesses the filesystem
    • Testing with mocks
  • Zulip testing philosophy
    • Endpoint tests
    • Library tests
    • Fixture-driven tests
    • Mocks and stubs
    • Template tests
    • SQL performance tests
    • Event-based tests
    • Negative tests
  • Testing considerations
• JavaScript/TypeScript unit tests
  • How the node tests work
  • Handling dependencies in unit tests
  • Creating new test modules
  • Coverage reports
  • Editor debugger integration
  • Webstorm integration setup
  • Running tests with the debugger
• Web frontend black-box Puppeteer tests
  • Running tests
  • How Puppeteer tests work
  • Debugging Puppeteer tests
  • Writing Puppeteer tests
• Python static type checker (mypy)
  • Installing mypy
  • Running mypy on Zulip’s code locally
  • Mypy is there to find bugs in Zulip before they impact users
  • Mypy stubs for third-party modules
  • Working with types from django-stubs
  • Using @overload to accurately describe variations
  • Best practices
    • When is a type annotation justified?
    • Avoid the Any type
    • Avoid cast()
    • Avoid # type: ignore comments
    • Avoid other unchecked constructs
    • Use Optional and None correctly
    • Read-only types
    • Typing decorators
  • Troubleshooting advice
• TypeScript static types
  • Type checking
  • Linting and style
  • Migration strategy
• Continuous integration (CI)
  • Goals
  • GitHub Actions
    • Useful debugging tips and tools
    • Suites
    • Configuration
    • Images
    • Performance optimizations
• Manual testing
  • Basic stuff
    • Message view
    • Messagebox
    • Message editing
    • Narrowing
    • Composing messages
    • Popover menus
    • Sidebar filtering
    • Stream permissions
    • Search
    • Stream settings
    • User settings
    • Keyboard shortcuts
    • Miscellaneous menu options
    • Inviting users/tutorial
    • To be continued…
• Testing philosophy
  • Effective testing allows us to move quickly
  • Test suite performance and reliability are critical
  • Integration testing or unit testing?
  • Avoid duplicating code with security impact
  • Share test setup code
  • What isn’t tested probably doesn’t work