OverviewTeaching: 5 min
Exercises: 10 minQuestions
How can I tell what state my project is actually in?Objectives
Explain how continuous integration works.
Configure continuous integration for a small software project.
- Continuous integration:
- Build and test code every time someone commits code
- Post results somewhere the team can see them
- If build or tests fail, send out notifications
- Even better: build and test changes before they’re merged
- Only do code review on changes that have passed mechanical checks
- Keep track of test coverage
- Which parts of the code are being exercised and which aren’t
- Many different ways to measure
- Most important measurement is “are we holding steady?”
- Most widely used system is Travis CI
- Easy integration with Github
- Will run tests on multiple platforms and with multiple versions of tools
- Developers still have to build the tests
- CI only as good as the tests it runs
- Check style as well as correctness
- Sometimes called “linters” after the original lint for C
- Equivalents have been built for most languages
- Most are configurable
- Stick to a pre-defined style rather than argue about one of your own
- Automatic enforcement eliminates subjective arguments
- If the linter passes, the code is approved
- Guarantees you never have to worry about style if the linter is happy
- Most linters support exceptions, these can be approved in code review on a case-by-case basis
Lint Your Code
- Find and install a lint-like tool for your preferred language and run it on your code.
- What does it complain about?
- Which of its complaints do you disagree with?
Setting Up Continuous Integration
Follow the steps in this tutorial to set up Travis-CI testing for the SNDS repository. How long did it take you to set this up?
Continuous integration rebuilds and/or re-tests software every time something changes.
Use continuous integration to check changes before they are inspected.
Check style as well as correctness.
Adopt a widely-used pre-defined coding style rather than inventing one of your own.