Request for Kotest version of GreetingServiceTest.kt

[mfickett]

There is a gRPC service test example for Kotlin using JUnit: https://github.com/micronaut-projects/micronaut-grpc/blob/master/examples/hello-world-kotlin/src/test/kotlin/helloworld/GreetingServiceTest.kt .

It would be great to have this example with Kotest, either instead or in addition.

I'm not sure if micronaut-grpc examples use kotest at all / what the build changes required would be; I think it may just be changing testRuntime to kotest in the build.gradle and adding a ProjectConfig.kt (docs at https://kotest.io/project_config/ and note it can now be a sibling of the other test files instead of being in the provided package).

The bean factory can be added to the ProjectConfig.kt or can be in its own file that's a peer of the test file. It didn't work for me to have the @Factory in the same file as the test. But I think the code changes are relatively minor:

GreetingServiceFactory.kt:

@Factory
class GreetingServiceFactory {
    @Singleton
    fun greetingClient( @GrpcChannel(GrpcServerChannel.NAME) channel : ManagedChannel ) : GreeterGrpcKt.GreeterCoroutineStub {
        return GreeterGrpcKt.GreeterCoroutineStub(
                channel
        )
    }
}

The test structure changes slightly:

GreetingServiceTest.kt:

import io.kotest.core.spec.style.StringSpec
import io.micronaut.test.extensions.kotest.annotation.MicronautTest
import io.kotest.matchers.shouldBe

@MicronautTest
class GreetingServiceTest: StringSpec() {

    @Inject
    lateinit var greetingClient : GreeterGrpcKt.GreeterCoroutineStub

    init {
        "test a response" {
            val actual = greetingClient.sayHello(
                            HelloRequest.newBuilder().setName("John").build()
                    ).message
            actual shouldBe "Hello John"
        }
    }
}