Mocking and Stubbing in Clojure

Mocking exists in Clojure, but idiomatic Clojure often needs less of it because you can pass behavior directly as a function and keep most logic pure.

Practical patterns that Java developers usually like:

• pass dependencies as a map of functions ({:now now-fn :fetch fetch-fn})
• keep interop/I/O behind a small adapter namespace
• test pure transforms directly without stubbing the world

Tools like with-redefs can be useful, but they temporarily change global var roots—so use them deliberately and keep the scope tight.

In this section

• Understanding the Purpose of Mocks and Stubs in Clojure Testing
  Explore the role of mocks and stubs in Clojure testing, focusing on their use in managing side effects and external systems.
• Mocking Libraries for Clojure Testing
  Explore mocking libraries and techniques in Clojure, including clojure.test.mock and with-redefs, to enhance your testing strategy.
• Clojure Testing with Mocks: A Guide for Java Developers
  Explore how to write tests with mocks in Clojure, leveraging your Java experience to enhance code isolation and reliability.