Fail a phpunit test if coverage goes below a threshold

Tools like maven allow to fail a build pipeline if the coverage of unit tests goes below a given threshold. For phpunit and PHP project, there is no such option. So here is a trick to fail your pipeline if the coverage of your phpunit tests goes below a threshold.

The trick consists of 2 steps:

1. run phpunit with the option --coverage-xml to create an xml coverage report;
2. use a custom script (we will call it phpunit-threshold to parse the xml report and fail if the coverage goes below a provided threshold.

phpunit

For the first step, you have to run phpunit with the option --coverage-xml:

./vendor/bin/phpunit --coverage-xml target/coverage

This will create a directory called target/coverage, with a bunch of xml report files, including one file called index.xml

phpunit-threshold

We can now create a script called phpunit-threshold.php that will parse this xml report:

<?php

/**
 * phpunit-threshold.php
 * check if the coverage of phpunit is above specified threshold
 * https://cylab.be/blog/114/fail-a-phpunit-test-if-coverage-goes-below-a-threshold
 */

if ($argc != 3) {
    echo "Usage: " . $argv[0] . " <path/to/index.xml> <threshold>
";
    exit(-1);
}

$file = $argv[1];
$threshold = (double) $argv[2];

$coverage = simplexml_load_file($file);
$ratio = (double) $coverage->project->directory->totals->lines["percent"];

echo "Line coverage: $ratio%
";
echo "Threshold: $threshold%
";

if ($ratio < $threshold) {
    echo "FAILED!
";
    exit(-1);
}

echo "SUCCESS!
";

To use this script, we must indicate that path to index.xml as the first argument, and the desired coverage (in percent) as the second argument:

php phpunit-threshold.php target/coverage/index.xml 90

GitLab

Now you can add this test to your .gitlab-ci.yml:

test:
  image: cylab/php72
  before_script:
    # Install all project dependencies
    - COMPOSER_CACHE_DIR=composer-cache composer install
  script:
    - vendor/bin/phpunit --coverage-text --coverage-xml target/coverage-xml
    - php phpunit-threshold.php target/coverage-xml/index.xml 80