hey guys, is there any tutorial on how to use <https://testcontainers.com/> to test a ktor server im...

# ktor

[Hristijan]

hey guys, is there any tutorial on how to use https://testcontainers.com/ to test a ktor server implementation running a postgresql/mysql database?

[antonarhipov]

I have an example here: https://github.com/antonarhipov/ktor-workshop/tree/branch08/src/test/kotlin/jetbrains/org

[Hristijan]

i can see that you have a runBlocking as a means to test the client.X functionality, although the docs point out to this kind of usage (see image), i’m a bit confused, what’s the difference and which one should i be using?

[antonarhipov]

That's because I extracted the testapplication into a field in the test to reuse the instance of the application:
https://github.com/antonarhipov/ktor-workshop/blob/branch08/src/test/kotlin/jetbrains/org/ControllerIntegrationTest.kt#L28-L40

[Hristijan]

thank you, i got it working as well, didn’t know that you had to have docker running in order to run the test containers

my impl. looks like this

[antonarhipov]

There are two tests that use the TestContainers
1. DatabaseIntegrationTest - doesn't use TestApplication instance all all as it tests the service directly. Here I need runBlocking because some methods required coroutine scope
2. ControllerIntegrationTest - uses TestApplication as the tests are calling the application APIs via the client. Same issue with coroutine scope

[antonarhipov]

didn’t know that you had to have docker running in order to run the test containers

sure. Docker compatible environment is required to start the containers. I can be anything else than Docker, AFAIK, but I haven't tried