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Eftest is a fast and pretty Clojure test runner.


To install, add the following to your project :dependencies:

[eftest "0.5.9"]

Alternatively, if you just want to use Eftest as a lein test replacement, add the following to your project :plugins:

[lein-eftest "0.5.9"]


When all the tests pass, it looks like this:

Passing example

When a test fails, it looks like:

Failing example

And when a test throws an exception, it looks like:

Erroring example



Eftest has two main functions: find-tests and run-tests.

The find-tests function searches a source, which can be a namespace, directory path, symbol, var, or a collection of any of the previous. It returns a collection of test vars found in the source.

The run-tests function accepts a collection of test vars and runs them, delivering a report on the tests as it goes.

Typically these two functions are used together:

user=> (require '[eftest.runner :refer [find-tests run-tests]])
user=> (run-tests (find-tests "test"))

The above example will run all tests found in the "test" directory.


By default Eftest runs all tests in parallel, which can cause issues with tests that expect to be single-threaded. To disable this and set all tests to be executed in serial, set the :multithread? option to false:

user=> (run-tests (find-tests "test") {:multithread? false})

If you want the test vars inside a namespace to be executed in parallel, but the namespaces themselves to be executed in serial, then set the :multithread? option to :vars:

user=> (run-tests (find-tests "test") {:multithread? :vars})

If you want the vars inside a namespace to execute in serial, but the namespaces to be executed in parallel, set the :multithread? option to :namespaces:

user=> (run-tests (find-tests "test") {:multithread? :namespaces})

Alternatively, you can add the :eftest/synchronized key as metadata to any tests you want to force to be executed in serial:

(deftest ^:eftest/synchronized a-test
  (is (= 1 1)))

Or you can synchronize the entire namespace:

(ns ^:eftest/synchronized foo.core-test
  (:require [clojure.test :refer :all]
            [foo.core :refer :all]))
Setting the number of threads used

When multithreading is enabled, Eftest uses a single fixed-threadpool ExecutorService to run all selected tests.

By default, Eftest will instantiate the threadpool with the number of processors (cores) available to the JVM, as reported by Runtime.availableProcessors. (NB: in some circumstances, such as in a CircleCI test container, Runtime.availableProcessors returns an erroneous value.)

Users can override the default behavior by including the key :thread-count in the options map supplied to run-tests with the value being any positive integer:

user=> (run-tests (find-tests "test") {:thread-count 4})


You can also change the reporting function used. For example, if you want a colorized reporter but without the progress bar:

user=> (run-tests (find-tests "test") {:report})

Or JUnit output:

user=> (run-tests (find-tests "test") {:report})

Or maybe you just want the old Clojure test reporter:

user=> (run-tests (find-tests "test") {:report clojure.test/report})

If you want to redirect reporting output to a file, use the function:

user=> (require '[ :refer [report-to-file]])
user=> (require '[ :as ju])
user=> (run-tests (find-tests "test") {:report (report-to-file ju/report "test.xml")})

Output capturing

By default the STDOUT and STDERR from each test is captured, and displayed only if the test fails. This includes all the output generated by the test itself, and any output generated by other threads not currently running a test.

To turn off this behavior, set the :capture-output? option to false:

user=> (run-tests (find-tests "test") {:capture-output? false})

Fast failure

Sometimes it's useful to end the testing on the first test failure. To do this set the :fail-fast? option to true:

user=> (run-tests (find-tests "test") {:fail-fast? true})

Long test reporting

If you wish to monitor the length of time to run each test, you can set the :test-warn-time option to the threshold in milliseconds you wish to warn on long test for. The measured duration includes the running of :each-fixtures, but not :once-fixtures.

If you know a particular test to be slow and are ok with that, and don't want to continually be warned about it, you can add the metadata :eftest/slow to either the individual test, or the entire namespace, to prevent reporting.

Note that currently only the pretty and progress reporters support logging long tests.

;; Warns for all tests that take longer than 500ms
user=> (run-tests (find-tests "test") {:test-warn-time 500})


To use the Lein-Eftest plugin, just run:

lein eftest

You can customize the reporter and configure the concurrency settings by adding an :eftest key to your project map:

:eftest {:multithread? :vars
         :thread-count 4
         ;; You can optionally write the output to a file like so:
         :report-to-file "target/junit.xml"}

Leiningen test selectors also work. With namespaces:

lein eftest foo.baz-test

And with metadata keywords:

lein eftest :integration


Copyright © 2019 James Reeves

Distributed under the Eclipse Public License either version 1.0 or (at your option) any later version.


Fast and pretty Clojure test runner




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