Is there a good way to write automated tests for C...

# compose-web

[Carter]

Is there a good way to write automated tests for Compose Web? I see some resources mentioned for Compose Desktop but not sure where I might look for Web.

[Oleksandr Karpovich [JB]]

We use Selenium for some tests of compose-web components.
There are of course other tools to help with integration tests. But with Selenium we can use Kotlin.

For some rather simple cases we use just kotlin/js tests.

I'm not sure our setup of Selenium tests is the best example of testing web apps. https://github.com/JetBrains/compose-jb/tree/master/web/integration-core/src/jvmTest/kotlin/org/jetbrains/compose/web/tests/integration
But it might give some direction.

[Carter]

Thank you, I’ll look into that example. So far I’m using plain kotlin-js tests for asserts for models, viewmodels, etc although I expect some of the UI itself will need more sophistication.

[Carter]

Also is there anything you’re using for coverage?

Right now I’m putting as much as I can under commonMain and adding a jvm target and generating coverage reports with jacoco. But it leaves a gap for things under jsMaim.

[Oleksandr Karpovich [JB]]

You are right. When it comes to web UI tests some tools like Selenium, puppeteer or others could be used.

[Oleksandr Karpovich [JB]]

No, we didn't add anything for coverage yet. But it's a good thing to have of course. I'll need to think about it. The most of compose code is in jsMain, and i don't know how to measure its coverage so far

[Carter]

Thanks—I know things are early for Compose Web. Although I’ve been doing Kotlin on Android and the JVM for years, I’m a noob at what’s going on in Javascript so I don’t have as much knowledge to draw upon.

Are you doing anything for screenshot automation? That would also help speed up testing, so a human can quickly review that things look OK.

[Oleksandr Karpovich [JB]]

Screenshot automation is also something we consider worth doing especially for widgets. Although we don't have it yet.

[Big Chungus]

You could use jest for coverage. Although that needs source maps to be useful