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How do you get your team to write tests? (programming.dev)

submitted 1 year ago* (last edited 1 year ago) by [email protected] to c/[email protected]

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I'm like a test unitarian. Unit tests? Great. Integration tests? Awesome. End to end tests? If you're into that kind of thing, go for it. Coverage of lines of code doesn't matter. Coverage of critical business functions does. I think TDD can be a cult, but writing software that way for a little bit is a good training exercise.

I'm a senior engineer at a small startup. We need to move fast, ship new stuff fast, and get things moving. We've got CICD running mocked unit tests, integration tests, and end to end tests, with patterns and tooling for each.

I have support from the CTO in getting more testing in, and I'm able to use testing to cover bugs and regressions, and there's solid testing on a few critical user path features. However, I get resistance from the team on getting enough testing to prevent regressions going forward.

The resistance is usually along lines like:

You shouldn't have to refactor to test something
We shouldn't use mocks, only integration testing works.
- Repeat for test types N and M
We can't test yet, we're going to make changes soon.

How can I convince the team that the tools available to them will help, and will improve their productivity and cut down time having to firefight?

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[–] [email protected] 21 points 1 year ago (4 children)

Two rules:

All code gets reviewed by a team member before getting merged.
Fail code reviews if there are not sufficient tests.

[–] Skyzyx 1 points 1 year ago* (last edited 1 year ago)

I think that instead of "forcing tests", you should instead focus on "proving quality." You think that works the way you thought? Cool. How do you know? What if they were to use 128 NUL bytes? Would it still do the right thing? Cool. How do you know?

Ensuring quality is a larger concept than simply writing tests, but writing tests is definitely part of it. I think if you aim higher and teach the provability of quality, then the better engineers will self-select by starting to write tests.

"If you want to build a ship, don't drum up people to collect wood and don't assign them tasks and work, but rather teach them to long for the endless immensity of the sea." — Antoine de Saint-Exupery

Additionally, if you're one person against the world, you're going to have a tough time. Build alliances. Partner with people who will reinforce the message. If you are the only one telling them something they don't like, they will shun you for it. But if you partner with allies who all have the same message, people are more likely to start to listen. It starts to become a community.

And if all else fails, prove the value of tests by going first. You can't force anyone to do anything. But you can start doing this yourself. At some point, if code gets called into question, you can look at the tests together to see what's covered and how that thing is supposed to work. It's all part of letting the robots do what the robots are good at, which frees you up to do the things that you're good at.

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