jest-junit

What is jest-junit?

The jest-junit npm package is a Jest reporter that creates compatible JUnit XML reports. It's primarily used in CI/CD pipelines to integrate test results with tools that consume JUnit XML format, such as Jenkins, CircleCI, and others. This allows for better visualization of test outcomes and more efficient debugging when tests fail.

What are jest-junit's main functionalities?

Generating JUnit XML reports

This command runs Jest tests and generates a JUnit XML report. The '--reporters' option specifies that both the default reporter and jest-junit should be used, allowing for output in the console as well as the creation of an XML report.

jest --reporters=default --reporters=jest-junit

Customizing output location and file name

This example demonstrates how to customize the output directory and file name of the JUnit XML report using environment variables. The report will be saved to './artifacts/my_test_results.xml'.

JEST_JUNIT_OUTPUT_DIR='./artifacts' JEST_JUNIT_OUTPUT_NAME='my_test_results.xml' jest --reporters=default --reporters=jest-junit

Configuring through jest.config.js

This code snippet shows how to configure jest-junit through Jest's configuration file, jest.config.js. It specifies custom values for the suite name, output directory, and file name of the report.

module.exports = { reporters: ['default', ['jest-junit', { suiteName: 'My Suite', outputDirectory: './reports', outputName: 'results.xml' }]] };

Other packages similar to jest-junit

mocha-junit-reporter

Similar to jest-junit, mocha-junit-reporter is designed for Mocha tests. It generates JUnit XML reports for Mocha test suites. While jest-junit is tailored for Jest, mocha-junit-reporter offers similar functionality for projects using Mocha as their testing framework.

karma-junit-reporter

karma-junit-reporter is a plugin for the Karma test runner that outputs test results in JUnit XML format. It serves a similar purpose for Karma-based projects, providing integration with CI/CD tools that require JUnit XML reports. Compared to jest-junit, it's specific to the Karma ecosystem.

jasmine-reporters

jasmine-reporters is a package that provides JUnit XML reporting for Jasmine, another popular testing framework. It includes a JUnit reporter among other reporter types. This package is analogous to jest-junit for projects that use Jasmine, enabling them to generate JUnit-compatible reports.

README

jest-junit

A Jest reporter that creates compatible junit xml files

Installation

yarn add --dev jest-junit

Important Notice

In an upcoming major version 5.x jest-junit will no longer function as a testResultProcessor. It will only work as a jest reporter. See the docs just below this for how to transition your project.

Usage

In your jest config add the following entry:

{
  "reporters": [ "default", "jest-junit" ]
}

Then simply run:

jest

Usage as testResultsProcessor

In your jest config add the following entry:

{
  "testResultsProcessor": "jest-junit"
}

Then simply run:

jest

For your Continuous Integration you can simply do:

jest --ci --testResultsProcessor="jest-junit"

Configuration

jest-junit offers seven configurations based on environment variables or a jest-junit key defined in package.json or a reporter option. Environement variable and package.json configuration should be strings. Reporter options should also be strings exception for suiteNameTemplate, classNameTemplate, titleNameTemplate that can also accept a function returning a string.

Variable Name	Description	Default	Possible Injection Values
JEST_SUITE_NAME	name attribute of <testsuites>	"jest tests"	N/A
JEST_JUNIT_OUTPUT	File path to save the output.	"./junit.xml"	N/A
JEST_JUNIT_SUITE_NAME	Template string for name attribute of the <testsuite>.	"{title}"	{title}, {filepath}, {filename}, {displayName}
JEST_JUNIT_CLASSNAME	Template string for the classname attribute of <testcase>.	"{classname} {title}"	{classname}, {title}, {filepath}, {filename}, {displayName}
JEST_JUNIT_TITLE	Template string for the name attribute of <testcase>.	"{classname} {title}"	{classname}, {title}, {filepath}, {filename}, {displayName}
JEST_JUNIT_ANCESTOR_SEPARATOR	Character(s) used to join the describe blocks.	" "	N/A
JEST_USE_PATH_FOR_SUITE_NAME	DEPRECATED. Use suiteNameTemplate instead. Use file path as the name attribute of <testsuite>	"false"	N/A

You can configure these options via the command line as seen below:

JEST_SUITE_NAME="Jest JUnit Unit Tests" JEST_JUNIT_OUTPUT="./artifacts/junit.xml" jest

Or you can also define a jest-junit key in your package.json. All are string values.

{
  ...
  "jest-junit": {
    "suiteName": "jest tests",
    "output": "./junit.xml",
    "classNameTemplate": "{classname}-{title}",
    "titleTemplate": "{classname}-{title}",
    "ancestorSeparator": " › ",
    "usePathForSuiteName": "true"
  }
}

Or you can define your options in your reporter configuration.

// jest.config.js
{
	reporters: [
      "default",
    	[ "jest-junit", { suiteName: "jest tests" } ]
  ]
}

Configuration Precedence

If using the usePathForSuiteName and suiteNameTemplate, the usePathForSuiteName value will take precedence. ie: if usePathForSuiteName=true and suiteNameTemplate="{filename}", the filepath will be used as the name attribute of the <testsuite> in the rendered jest-junit.xml).

Examples

Below are some example configuration values and the rendered .xml to created by jest-junit.

The following test defined in the file /__tests__/addition.test.js will be used for all examples:

describe('addition', () => {
  describe('positive numbers', () => {
    it('should add up', () => {
      expect(1 + 2).toBe(3);
    });
  });
});

Example 1

The default output:

<testsuites name="jest tests">
  <testsuite name="addition" tests="1" errors="0" failures="0" skipped="0" timestamp="2017-07-13T09:42:28" time="0.161">
    <testcase classname="addition positive numbers should add up" name="addition positive numbers should add up" time="0.004">
    </testcase>
  </testsuite>
</testsuites>

Example 2

Using the classNameTemplate and titleTemplate:

JEST_JUNIT_CLASSNAME="{classname}" JEST_JUNIT_TITLE="{title}" jest

renders

<testsuites name="jest tests">
  <testsuite name="addition" tests="1" errors="0" failures="0" skipped="0" timestamp="2017-07-13T09:45:42" time="0.154">
    <testcase classname="addition positive numbers" name="should add up" time="0.005">
    </testcase>
  </testsuite>
</testsuites>

Example 3

Using the ancestorSeparator:

JEST_JUNIT_ANCESTOR_SEPARATOR=" › " jest

renders

<testsuites name="jest tests">
  <testsuite name="addition" tests="1" errors="0" failures="0" skipped="0" timestamp="2017-07-13T09:47:12" time="0.162">
    <testcase classname="addition › positive numbers should add up" name="addition › positive numbers should add up" time="0.004">
    </testcase>
  </testsuite>
</testsuites>

Example 4

Using the suiteNameTemplate:

JEST_JUNIT_SUIT_NAME ="{filename}" jest

<testsuites name="jest tests">
  <testsuite name="addition.test.js" tests="1" errors="0" failures="0" skipped="0" timestamp="2017-07-13T09:42:28" time="0.161">
    <testcase classname="addition positive numbers should add up" name="addition positive numbers should add up" time="0.004">
    </testcase>
  </testsuite>
</testsuites>

Example 5

Using classNameTemplate as a function in reporter options

// jest.config.js
{
  reporters: [
    "default",
      [
        "jest-junit",
        {
          classNameTemplate: (vars) => {
            return vars.classname.toUpperCase();
          }
        }
      ]
  ]
}

renders

<testsuites name="jest tests">
  <testsuite name="addition" tests="1" errors="0" failures="0" skipped="0" timestamp="2017-07-13T09:42:28" time="0.161">
    <testcase classname="ADDITION POSITIVE NUMBERS" name="addition positive numbers should add up" time="0.004">
    </testcase>
  </testsuite>
</testsuites>