Hello team, I'm writing a custom ktor client plugi...

# ktor

[Xavier F. Gouchet]

Hello team, I'm writing a custom ktor client plugin, and I'd like to write unit tests. I tried applying the plugin to a client with the official MockEngine, but it seems my plugin's callback (onRequest and onResponse) are never called with the MockEngine, but they are with the real one. Is there a best practice to test a client plugin ?

[hfhbd]

You should always also test with a real setup. You can do this by running an embeddedServer in your tests.

[Xavier F. Gouchet]

Oh there's no way to test a plugin against a mock client engine then ? Thanks

[hfhbd]

Nope, the mock engine is very low level and returns the response directly without the pipeline.

[Aleksei Tirman [JB]]

Can you describe what your plugin does?

[Xavier F. Gouchet]

A couple of things like monitoring the requests but also updating some headers in outgoing requests

[Aleksei Tirman [JB]]

You can try using the testApplication function to test your plugin.