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Programming language: Elixir
License: MIT License
Tags: Testing    
Latest version: v0.3.0

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A mix task to execute eunit tests.

  • Works in umbrella projects.
  • Tests can be in the module or in the test directory.
  • Allows the user to provide a list of patterns for tests to run.


mix eunit # run all the tests
mix eunit --verbose "foo*" "*_test" # verbose run foo*.erl and *_test.erl


Add to your mix.exs deps:

def deps
  [#... existing deps,
   {:mix_eunit, "~> 0.2"}]


mix deps.get
mix deps.compile
mix eunit

To make the eunit task run in the :test environment, add the following to the project section of you mix file:

def project
  [#... existing project settings,
   preferred_cli_env: [eunit: :test]

Command line options:

A list of patterns to match for test files can be supplied:

mix eunit foo* bar*

The runner automatically adds ".erl" to the patterns.

The following command line switch is also available:

  • --verbose, -v - run eunit with the :verbose option
  • --cover, -c - create a coverage report after running the tests
  • --profile, -p - show a list of the 10 slowest tests
  • --start - start applications after compilation
  • --no-color - disable color output
  • --force - force compilation regardless of compilation times
  • --no-compile - do not compile even if files require compilation
  • --no-archives-check - do not check archives
  • --no-deps-check - do not check dependencies
  • --no-elixir-version-check - do not check Elixir version

Project Settings:

The following mix.exs project settings affect the behavior of mix eunit.

def project
    # existing project settings

    # run the `eunit` task in the `:test` environment
    preferred_cli_env: [eunit: :test],

    # set the output directory for `mix eunit --cover` reports
    #   the default is `./cover` (same as `mix test --cover`)
    test_coverage: [output: "_build/#{Mix.env}/cover"]

    # set switches that affect every invocation of the eunit task
    eunit: [
      verbose: false,
      cover: true,
      profile: true,
      start: true,
      color: false


Note that mix eunit --cover and mix test --cover will not in general cover the same source code with tests and therefore will typically generate two independent coverage reports. There may be some overlap if your eunit and ExUnit tests cover some of the same code.

By default, mix eunit --cover produces coverage reports in HTML format in the same cover directory that mix test --cover does. You can override the mix eunit --cover output directory in your mix.exs file as described above.

Test search path:

All ".erl" files in the src and test directories are considered.