Hi, I'm working through the Ktor documentation and...

# ktor

[Paul at Avans Breda]

Hi, I'm working through the Ktor documentation and example Task API and curiously tried to use the just announced Ktor 3.0.0-beta-2.
I get the following error when at section: https://ktor.io/docs/3.0.0-beta-1/server-create-restful-apis.html#create-unit-tests

Execution failed for task ':compileTestKotlin'.

Could not resolve all files for configuration ':testCompileClasspath'.

> Could not find io.ktorktor server test base3.0.0-beta-2.
Searched in the following locations:
- https://repo.maven.apache.org/maven2/io/ktor/ktor-server-test-base/3.0.0-beta-2/ktor-server-test-base-3.0.0-beta-2.pom
Required by:
project : > io.ktorktor server tests jvm3.0.0-beta-2

Possible solution:
- Declare repository providing the artifact, see the documentation at https://docs.gradle.org/current/userguide/declaring_repositories.html

Any suggestions? Thanks!

[Aleksei Tirman [JB]]

To solve the problem, replace the io.ktor:ktor-server-tests-jvm artifact with io.ktor:ktor-server-test-host in the Gradle build configuration:

testImplementation("io.ktor:ktor-server-test-host")

[Paul at Avans Breda]

Thank you Aleksei, this solves the issue!

But I guess more steps are needed to get these tests working. Now I get the following:
Expected response body of the type 'class kotlin.collections.List' but was 'class io.ktor.utils.io.SourceByteReadChannel'
In response from <http://localhost/tasks/byPriority/Medium>
Response status 404 Not Found
Response header ContentType: null
Request header Accept: */*

You can read how to resolve NoTransformationFoundException at FAQ:
https://ktor.io/docs/faq.html#no-transformation-found-exception
io.ktor.client.call.NoTransformationFoundException: Expected response body of the type 'class kotlin.collections.List' but was 'class io.ktor.utils.io.SourceByteReadChannel'
In response from <http://localhost/tasks/byPriority/Medium>
Response status 404 Not Found
Response header ContentType: null
Request header Accept: */*

[Aleksei Tirman [JB]]

Please check that the ContentNegotiation plugin is installed.

[Paul at Avans Breda]

For Serialization.kt it is:

fun Application.configureSerialization() {
    install(ContentNegotiation) {
        json()
    }
    routing {
        get("/json/kotlinx-serialization") {
            call.respond(mapOf("hello" to "world"))
        }
    }
}

But for ApplicationTest.kt it fails to recognize install using the same imports:

class ApplicationTest {
    @Test
    fun tasksCanBeFoundByPriority() = testApplication {
        val client = createClient {
            testApplication.install(ContentNegotiation) {
                json()
            }
        }
    }

(I used the IntelliJ Ultimate Ktor plugin to generate the project with ContentNegotiation plugin. Maybe this project template is not updated for the latest Ktor version)

[Aleksei Tirman [JB]]

The project template should work for the new version of Ktor. Can you try to use the following code instead:

@Test
fun tasksCanBeFoundByPriority() = testApplication {
    val client = createClient {
        install(io.ktor.client.plugins.contentnegotiation.ContentNegotiation) {
            json()
        }
    }
}

[Paul at Avans Breda]

Thanks Aleksei, two things I learned (also with help from Bruce Hamilton):
• there exists both dependencies on client and server content-negotiation (I missed the client version for testing)
• when doing Ktor programmatic configuration no module is loaded in testApplication, so I had to add this line in each test:

application { module() }