Hi. I'm working with a team (and am myself) new to the JVM, Kotlin, and Rat Pack. I'm looking for any tutorials on how one goes about mocking outgoing http calls in tests.

If the code that is responsible for sending out requests is behind an interface, you can mock that with eg Mockito

@jlepper If you are looking to spin up a mock of a remote REST Server then you could have a look at WireMock - http://wiremock.org/ I have used that in the past to enable the simulation of edge cases & unexpected errors as well as the happy-path.