I'm trying to write unit tests for a post request but I'm having problems with the serialization: `...

# ktor

[S.]

I'm trying to write unit tests for a post request but I'm having problems with the serialization:

Fail to serialize body. Content has type: class .models.NewWord, but OutgoingContent expected.
java.lang.IllegalStateException: Fail to serialize body. Content has type: class .models.NewWord, but OutgoingContent expected.
If you expect serialized body, please check that you have installed the corresponding plugin(like `ContentNegotiation`) and set `Content-Type` header.

My test according to the docs (2.0.0 btw) :

testApplication {
                val c = createClient {
                    install(ContentNegotiation) {
                        json()
                    }
                }
                val r = c.post("/word") {
                    contentType(ContentType.Application.Json)
                    setBody(NewWord("a", "b", "c"))
                }
            }

I also tried header() instead of contentType() but doesn't work either

header(HttpHeaders.ContentType, ContentType.Application.Json.toString())

the NewWord class is Serializable ofc. what am I missing?

[Rustam Siniukov]

Can you check that you import ContentNegotiation from io.ktor.client.plugins ?

[S.]

io.ktor.client.plugins.* I mean, I have this import

[S.]

can't find a specific ContentNegotiation object from the client stuff tho

[Rustam Siniukov]

my guess was that there are two ContentNegotiation plugins, for server and for client. It’s possible that you use one for server. The code will still compile, because there is install in the scope of testApplication too

[S.]

yeah you're right

[S.]

just had to add the io.ktor:ktor-client-content-negotiation dependency

[Rustam Siniukov]

We may need to add @DslMarker to these builders. Thanks for your report

[Aleksei Tirman [JB]]

Here is another issue.