Is there a way to setup

RequestContext

for unit tests that are using a mocked request?

Why would you use a mocked request? One of the main design goals appears to be that mocks are not necessary for testing anything with http4k, just use a real request. myhandler(Request(GET, Uri.of("/path")).body("whatever"))

Precisely. Requests/Responses are values and not expected to be mocked.

Working with existing code

Most http4k applications are composed in such way that you can pick a part of it (http handler + key filters) and test that without much need for mocking.

Yeah, having taken a break from java and done Node for a couple years the pattern makes sense. Not how the codebase I inherited did things though.

not as lightweight as the core of http4k 😉 https://github.com/http4k/http4k/blob/master/http4k-core/src/main/kotlin/org/http4k/core/Http4k.kt

It's practically obese by comparison 😂

What is needed to create the RequestContext during tests?