Hello I am getting an error running a test for websocket cli kotlinlang #ktor

io.ktor.client.call.NoTransformationFoundException: No transformation found: class io.ktor.utils.io.ByteBufferChannel (Kotlin reflection is not available) -> class io.ktor.client.plugins.websocket.DefaultClientWebSocketSession (Kotlin reflection is not available)

Are we to use the same

MockEngine

for websockets?

More errors when I ran the test against ios

kotlinx.serialization.SerializationException: Serializer for class 'DefaultClientWebSocketSession' is not found.

Mark the class as @Serializable or provide the serializer explicitly.

@Aleksei Tirman [JB] I can't mark

DefaultClientWebSocketSession

as Serializable. Is there a workaround?

Aleksei Tirman [JB]

01/24/2023, 11:01 AM

Could you please share the code of your test?

Cherrio LLC

01/24/2023, 11:01 AM

private val mockEngine = MockEngine { _ ->
        respond(
            content = """{"status":"successful", "message":"success", "data":"Yes"}""",
            status = HttpStatusCode.SwitchingProtocols,
            headers = headersOf(HttpHeaders.ContentType, "application/text")
        )
    }

@Test
    fun connect_success_ForConnection() = runTest {
        data.configure("url","user","path")
        val connectResponse = data.connectToServer().unBox()
        assertEquals("Connected", connectResponse)
    }

Aleksei Tirman [JB]

01/24/2023, 11:02 AM

And what are you trying to test?

Cherrio LLC

01/24/2023, 11:03 AM

Test connection

The

connectToServer()

emits a message when a connection is established.

while (true) {
                        emit("Connected")
         
                        val frame = incoming.receive()
                        if (frame is Frame.Text) {
                            emit(frame.readText())
                        }
                    }

Aleksei Tirman [JB]

01/24/2023, 11:06 AM

So you want to mock a server that accepts a Websockets connection?

Cherrio LLC

01/24/2023, 11:06 AM

Yes.

Aleksei Tirman [JB]

01/24/2023, 11:11 AM

Unfortunately, the

MockEngine

doesn’t have such capabilities and making

DefaultClientWebSocketSession

serializable won’t help. You may try to test your client from the other end by using the testApplication.

Cherrio LLC

01/24/2023, 11:14 AM

Okay. 👍

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