Kaocha Test Runner

LambdaIsland/Kaocha is a feature rich test runner for Clojure and ClojureScript.

Koacha is typically run on the command line or as part of a continuous integration workflow.

Kaocha can also be run as an alternative to the cider-test runner as the Spacemacs Clojure layer now includes kaocha-runner.el. Kaocha provides options to fail-fast (stops when a test fails) and

Using Kaocha from Emacs Cider

SPC f e d to edit the Spacemacs configuration file, adding clojure-enable-kaocha-runner t as a variable to the Clojure layer.

Start a REPL process that includes the kaocha library

:lib/kaocha alias in practicalli/clojure-deps-edn includes Kaocha as a library

clojure -M:lib/kaocha:repl/rebel

Key bindings

, t k a to run all tests

, t k t to run the deftest at point (under the cursor)

, t k n to run tests in the current namespace

, t k w to show warnings from the kaocha runner

, t k h to hide the kaocha test window

Kaochan runner uses kaocha.repl

kaocha-runner.el uses the the same appraoch as running Kaocha from the REPL

Using Kaocha from Command Line

Kaocha on the command line will run tests from the saved code files, so is very useful to run before committing files as well as during a Continuous Integration workflow.

practicalli/clojure-deps-edn defines aliases to run Kaocha from the clojure command:

clojure -X:test/run will run all tests found in the project, unless there is a failing test which will end the test run.

clojure -X:test/watch runs all test and then watches for changes to the test code, running again if a change is detected.

Kaocha shell script

Kaocha install guide recommends creating an executable shell script file, i.e. bin/kaocha

Use the :test/run alias from practicalli/clojure-deps-edn (or create an alias in the project deps.edn file)

#!/usr/bin/env bash

clojure -X:test/run "$@"

Run the shell script to run all the tests


To continually watch a function, pass the watch argument :watch? true

bin/kaocha :watch? true

Or define a binary that always watches, e.g. bin/kaocha-watch using the :test/watch alias from practicalli/clojure-deps-edn

#!/usr/bin/env bash

clojure -X:test/watch "$@"

Configure kaocha in tests.edn

tests.edn in the root of a project can define the full range of options for Kaocha configuration options and is the preferred approach.

Continuous Integration workflow

Add :test/run alias to the project deps.edn file and define kaocha configuration in a tests.edn file in the root of the project.

Define a job that runs the tests that calls either the kaocha script or the clojure command to run all the tests.

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