README

EnforceAaaPatternRector

The EnforceAaaPatternRector rule helps maintain consistent Arrange–Act–Assert (AAA) structure in PHPUnit tests. It automatically annotates your test methods with // Arrange, // Act, and // Assert comments, improving readability and making the test structure explicit.

Example

 final class FooTest extends PHPUnit\Framework\TestCase
 {
     public function testFoo(): void
     {
-        $date = new DateTimeImmutable('2025-01-01');
-        $formatted = $date->format('Y-m-d');
-        $this->assertEquals('2025-01-01', $formatted);
+        // Arrange
+        $date = new DateTimeImmutable('2025-01-01');
+        // Act
+        $formatted = $date->format('Y-m-d');
+        // Assert
+        $this->assertEquals('2025-01-01', $formatted);
     }
 }

This tool simply add comments and removing misplaced ones. Logic is simple: the line just above the first Assert call is commented as Assert, the first statement above it considered as Act and finally the very first line of the test method declaration commented as Arrange. So if the comment seems to you misplaced, consider rearrange your test accordingly. Nevertheless contributing is always welcomed

Installation

You can install the package via Composer:

composer require --dev savinmikhail/enforce-aaa-pattern-rector

Usage

To enable the rule, add it to your Rector configuration (rector.php):

<?php

declare(strict_types=1);

use Rector\Config\RectorConfig;
use SavinMikhail\EnforceAaaPatternRector\EnforceAaaPatternRector;

return static function (RectorConfig $rectorConfig): void {
    $rectorConfig->rule(EnforceAaaPatternRector::class);
};

Tests as Documentation

The package includes PHPUnit-based Rector tests demonstrating the rule in action.

Check the tests/Fixture directory to see examples of AAA annotation in various scenarios.

Contributing

Contributions, feedback, and suggestions are welcome! Feel free to open issues or submit pull requests.