JUnitFormatter

A simple ExUnit Formatter that collects test results and generates an xml report in JUnit format. This is intended to be used by tools that can produce a graphical report, mainly targeted at Jenkins and its support for JUnit.

The report is generated in Mix.Project.app_path folder with a default filename of test-junit-report.xml. It can be configured through application configuration on the key report_file (application junit_formatter).

Versions 3+ require minimum Elixir version to be 1.5+. For older releases, please use version 2.2 of this library.

Usage

First, add JUnitFormatter to the dependencies in your mix.exs:

  defp deps do
    [
      {:junit_formatter, "~> 3.1", only: [:test]}
    ]
  end

Next, add JUnitFormatter to your ExUnit configuration in test/test_helper.exs file. It should look like this:

ExUnit.configure formatters: [JUnitFormatter]
ExUnit.start

If you want to keep using the default formatter alongside the JUnitFormatter your test/test_helper.exs file should look like this:

ExUnit.configure formatters: [JUnitFormatter, ExUnit.CLIFormatter]
ExUnit.start

Then run your tests like normal:

....

Finished in 0.1 seconds (0.07s on load, 0.08s on tests)
4 tests, 0 failures

Randomized with seed 600810

The JUnit style XML report for this project looks like this:

<?xml version="1.0"?>
<testsuites>
	<testsuite errors="0" failures="0" name="Elixir.FormatterTest" tests="4" time="82086">
		<testcase classname="Elixir.FormatterTest" name="test it counts raises as failures" time="16805"/>
		<testcase classname="Elixir.FormatterTest" name="test that an invalid test generates a proper report" time="16463"/>
		<testcase classname="Elixir.FormatterTest" name="test that a valid test generates a proper report" time="16328"/>
		<testcase classname="Elixir.FormatterTest" name="test valid and invalid tests generates a proper report" time="32490"/>
	</testsuite>
</testsuites>

note: this example has been reformatted for readability.

Options

JUnitFormatter accepts 4 options that can be passed in config.exs (or equivalent environment configuration for tests):

print_report_file (boolean - default false): tells formatter if you want to see the path where the file is being written to in the console. This might help you debug where the file is. By default it writes the report to the Mix.Project.app_path folder. This ensures compatibility with umbrella apps.
report_file (binary - default "test-junit-report.xml"): the name of the file to write to. It must contain the extension. 99% of the time you will want the extension to be .xml, but if you don't you can pass any extension (though the contents of the file will be an xml document).
report_dir (binary - default Mix.Project.app_path()): the directory to which the formatter will write the report. Do not end it with a slash. IMPORTANT!! JUnitFormatter will NOT create the directory. If you are pointing to a directory that is outside _build then it is your duty to clean it and to be sure it exists.
prepend_project_name? (boolean - default false): tells if the report file should have the name of the project as a prefix. See the "Umbrella" part of the documentation.
include_filename? (boolean - default false): dictates whether <testcase>s in the XML report should include a "file" attribute of the relative path to the file of the test. Note that this defaults to false because not all JUnit ingesters will accept a file attribute.

Example configuration:

config :junit_formatter,
  report_file: "report_file_test.xml",
  report_dir: "/tmp",
  print_report_file: true,
  prepend_project_name?: true,
  include_filename?: true

This would generate the report at: /tmp/myapp-report_file_test.xml.

Umbrella projects

JUnitFormatter works with umbrella projects too. By default, it will generate the xml report on each sub-project build folder. So, as an example, if you have two apps (my-app and another) it will generate the following reports:

_build/test/lib/my_app/report_file.xml
_build/test/lib/another/report_file.xml

This works without any extra configuration. There are times, though, where you want to customize the directory where the reports are generated. Let's say you add this configuration:

config :junit_formatter,
  report_dir: "/tmp"

Then, while running in an umbrela project, the first sub-project will run and generate a report file the following path:

/tmp/report_file.xml

The next one will do the same OVERRIDING the first one. So, in order to avoid this, you can use the configuration option prepend_project_name? so that the result would be:

/tmp/my_app-report_file.xml
/tmp/another-report_file.xml

Integrating on CI systems

Most CIs have a way for uploading test reports. This is a nice way to understand what failed on your build. Most of them use the JUnit report file format to provide this feature.

CircleCI example configuration provides JUnit reports integration

LICENSE