Clojure: Expectations Interaction Tests For Java Objects

I recently ran into some code that forced me to integrate with a Java library. While using the library I found myself wanting to do a bit of interaction testing, which I've historically done with Mockito. As a result, I added the ability to do interaction based tests on mock Java objects, directly in expectations.

Hopefully the code is what you'd expect.

	(ns success.success-examples
	(:use expectations erajure.core))
	;; mock interaction based testing
	(expect-let [r (mock Runnable)]
	(interaction (.run r))
	(.run r))

view raw exp_mocking.clj hosted with ❤ by GitHub

The previous example creates a mock Runnable in an expect-let, expects the run method to be run, and then calls the run method of the mock. This test is worthless in a real world context, but it's the simplest way to demonstrate the syntax for creating a mock & specifying the interaction.

The mock function defined in erajure, a minimal wrapper around mockito. All of the "times" arguments are the same as what's available for function interaction tests, examples can be found here.