Hi :slightly_smiling_face: has anyone experience t...

# kodein

[Christoph Flick]

Hi 🙂
has anyone experience testing a ktor app using the kodein DI Feature?
I've got an application that looks like this:

fun Application.main() {
    di {
        bind<SomeService>() with singleton { SomeService(environment.config) }
    }
...

I use the service somewhere in the app, in the routes, etc.
My tests (kotest) look like that:

"A Request should do something" {
    withServer {
        val req = handleRequest {
            uri = "/someroute"
        }

        req.requestHandled shouldBe true
        req.response shouldHaveStatus HttpStatusCode.OK
    }
}

withServer is a wrapper for withTestApplication({ main() }, test)withTestApplication({ main() }, block)
My problem is that I currently need to test against a real database as I don't get the DI mock to work.
Any hints for me here?
Thanks!

[romainbsl]

Hi, maybe you could declare your bindings in a container, then pass it to your application, mocking it should be easy after that

val appDI = DI {
    bind<SomeService>() with singleton { SomeService(environment.config) }
}

fun Application.run(di: DI) {
    di {
        extend(appDI)
    }
}

fun Application.main() {
    run(appDI)
}

and in your tests something like

val mockDI = DI { 
        bind<SomeService>() with singleton { SomeMockService() }
    }
    withTestApplication({ run(mockDI) }, test)

[Christoph Flick]

Thank you very much, it works 🙂
I tried a similar solution before, but I've overridden the main() function instead of creating an alternative like run(), so it always used the one without parameters 😅