PHP Code Coverage Guard

Enforce code coverage in your CI with ease! Not by percentage, but target core functionality.

• 🎮 Game-changer: Innovative approach to code coverage enforcement!
• 💾 Legacy-friendly: Allows you to start enforcing for new code only!
• ⚙️ Extensible: You specify what must be covered!
• 🕸️ Lightweight: Only depends on nikic/php-parser
• 🍰 Easy-to-use: No config needed for first try

This tool helps ensure that certain code blocks are covered by tests, typically core methods in Facades, Controllers, and other key areas of your application.

Installation

composer require --dev shipmonk/coverage-guard

Example usage

# Run tests, collect coverage, generate report:
XDEBUG_MODE=coverage vendor/bin/phpunit tests --coverage-filter src --coverage-clover clover.xml

# Verify coverage:
vendor/bin/coverage-guard clover.xml

In real application, you will probably use phpunit.xml to configure PHPUnit coverage:

<coverage processUncoveredFiles="true">
    <include>
        <directory>src</directory>
    </include>
    <report>
        <clover outputFile="clover.xml"/>
    </report>
</coverage>

To collect coverage, you can pick traditional XDebug or performant PCOV extension.

Enforce coverage for new code only

git diff master...HEAD > changes.patch
vendor/bin/coverage-guard clover.xml --patch changes.patch # Without config, reports only fully new methods with 0% line coverage

• When patch is provided, this tool will only analyse changed files and methods and won't report violations from elsewhere.
• This allows you to gradually enforce code coverage for new code only.

Configuration

Create a coverage-guard.php file in your project root to customize behavior and set up your CoverageRules. The config file must return an instance of ShipMonk\CoverageGuard\Config:

<?php

use ShipMonk\CoverageGuard\Config;
use ShipMonk\CoverageGuard\Hierarchy\CodeBlock;
use ShipMonk\CoverageGuard\Hierarchy\ClassMethodBlock;
use ShipMonk\CoverageGuard\Rule\CoverageRule;
use ShipMonk\CoverageGuard\Rule\CoverageError;
use ShipMonk\CoverageGuard\Rule\EnforceCoverageForMethodsRule;

$config = new Config();

// Your main specification of what must be covered
$config->addRule(new EnforceCoverageForMethodsRule(
    requiredCoveragePercentage: 50,
    minMethodChangePercentage: 50, // when --patch is provided, check only methods changed by more than 50%
    minExecutableLines: 5, // only check methods with at least 5 executable lines
));

// Replace prefix of absolute paths in coverage files
// Handy if you want to reuse clover.xml generated in CI
$config->addCoveragePathMapping('/absolute/ci/prefix', __DIR__);

// As filepaths in git patches are relative to the project root, you can specify the root directory here
// It gets autodetected if cwd is beside /.git/ or if git binary is available
$config->setGitRoot(__DIR__);

// Make CLI file paths clickable to your IDE
// Available placeholders: {file}, {relFile}, {line}
$config->setEditorUrl('phpstorm://open?file={file}&line={line}');

return $config;

• For more advanced usage, implement CoverageRule and pass it to Config::addRule() method.
  • Inspire by prepared EnforceCoverageForMethodsRule or our own coverage config.

What can you enforce?

The CodeBlock class is aware which line is executable, changed and covered. Also, you can use reflection to pinpoint your rules. This allows you to setup huge variety of rules, examples:

• All newly created methods must have some coverage
• When a method is changed by more than 50%, it must have at least 50% coverage
• All methods in your codebase longer than 10 executable lines must have some coverage
• All Controller methods must have at least 50% coverage
• Every method must be tested unless custom #[NoCoverageAllowed] attribute is used
• ...

Cli options

• --patch <branch-diff.patch> verify only changed code
• --config <path/to/coverage-guard.php> specify a custom config filepath
• --verbose show detailed processing information
• --help show help message
• --no-color to disable colors (NO_COLOR env is also supported)
• --color to force colors even when output is not a TTY

Even --option=value syntax is supported.

Supported coverage formats

Format	Filesize	Rating	Notes
clover (.xml)	(baseline)	🟢 Best	Usable in PHPStorm coverage visualization. Allows better integrity checks.
cobertura (.xml)	1.7x bigger	🟡 OK	Usable in GitLab coverage visualization
php (.cov)	8x - 40x bigger	🔴 Avoid	May produce warnings on old PHPUnit when xdebug is not active. Good coverage causes HUGE filesizes easily reaching over 100 MB.

Contributing

• Check your code by composer check
• Autofix coding-style by composer fix:cs
• All functionality must be tested