Test it like it's pure
A pure function:
- has no side effects.
- always produces the same output for a given input.
Pure functions are known to be easy to test. We can use their characteristics to make all code easier to test.
Don’t mix logic and side effects in the same method
Even if you don’t write functional code, this is good practise. When separated from the rest you can test the logic to your hearts content, and create a single integration test for the side effects. We need side effects, but keep them isolated and in methods without conditionals.
Inject your dependencies
If everything that might vary is part of the input, the output can be deterministic. In contrast, letting the method have access to collaborators and state “behind the scenes”, creates variance that is independent of the input. That will make for more setup in the tests, and more combinations to cover.
Pure functions remove some of the hardest part from testing, you can use that knowledge in all software development.
Offer
SAMMAN TECHNICAL TRAINING
Send your team to a course and some of them will remember part of it. Use the Samman method and they will apply what they learn from day one.
Book a meeting if you want to talk to me about maintainable code, to explore how I might help your team. I offer this for free, since I rather talk tech than do sales pitches. Let's explore if I can help you, by trying to solve your problems from the start.
Comment on the blog!
Create a comment by emailing me.
Open an email to start writing.I will then add the comment to the post.