I want to test my Ktor application, but for many requests I need to set some part of the post request body, how should I go about that? For example if I want to set the

data

post parameter, should I just use it like this:

with(handleRequest(<http://HttpMethod.Post|HttpMethod.Post>, path, {
            body = "data=$data"
        })) {
            // test body
        }

Yes, but you can write your own extension function that does what you want