rmfa-testing

name	rmfa-testing
description	Guides writing and running tests for the Restrict Media File Access WordPress plugin using Codeception/wp-browser integration tests and Codeception E2E tests. Use when writing tests, debugging test failures, or adding coverage for new features.

Skill: RMFA Testing

When to Use

Use this skill when:

• Writing or modifying tests for the RMFA plugin.
• Running the test suite (integration or E2E Codeception).
• Debugging test failures.
• Adding test coverage for new features.

Test Frameworks

Framework	Location	Purpose
Codeception + wp-browser	tests/Integration/	WordPress integration tests (DB, hooks, filters).
Codeception + wp-browser	tests/EndToEnd/	Codeception browser E2E tests.

Dependencies

• PHP: lucatume/wp-browser ^4.
• JS: @wordpress/env ^10.8.
• Infrastructure: Docker (for wp-env), Selenium with Chromium (for E2E).

Running Tests

All commands run from the restrict-media-file-access/ plugin root:

# Start wp-env (required for all tests)
npm run wp-env:start

# Integration tests
composer tests:run:integration

# E2E tests (Codeception + Selenium)
composer tests:run:end-to-end

# All Codeception tests (integration + E2E)
npm run tests:run

# Via wp-env (runs inside container)
npm run tests:run:integration
npm run tests:run:end-to-end

# Clean Codeception output
composer tests:clean

Local Setup (macOS)

1. Install Docker, Composer, Node.js.
2. Enable host networking in Docker settings (Resources > Network).
3. Start Selenium: docker run -d --shm-size="2g" --net=host --name="selenium-chromium" selenium/standalone-chromium:latest
4. Install dependencies: composer run-script packages-install && npm install
5. Copy tests/.dist.env to tests/.env.
6. Create database fixture: npm run tests:export-db
7. Run tests: npm run tests:run

Test Configuration

Codeception Config (codeception.dist.yml)

namespace: Tests
support_namespace: Support
paths:
    tests: tests
    output: tests/_output
    data: tests/Support/Data
    support: tests/Support
params:
    - tests/.env

Suite Configs

• tests/Integration.suite.yml — Integration suite configuration.
• tests/EndToEnd.suite.yml — E2E suite configuration.

Environment Variables (tests/.env)

Copied from tests/.dist.env. Contains database credentials and WordPress test config for wp-browser.

Writing Integration Tests

File and Namespace Convention

tests/Integration/<Name>Test.php
→ Tests\Integration\<Name>Test

Or with subdirectories:

tests/Integration/<SubDir>/<Name>Test.php
→ Tests\Integration\<SubDir>\<Name>Test

Test Class Structure

<?php

namespace Tests\Integration;

use WP_UnitTestCase;
use A8C\SpecialProjects\RestrictMediaFileAccess\AttachmentsFileManager;

class AttachmentsFileManagerTest extends WP_UnitTestCase {

    private AttachmentsFileManager $file_manager;

    public function setUp(): void {
        parent::setUp();
        $this->file_manager = new AttachmentsFileManager();
    }

    public function tearDown(): void {
        parent::tearDown();
    }

    public function test_set_file_as_protected_returns_true_for_new_restriction(): void {
        $attachment_id = self::factory()->attachment->create_upload_object( ... );
        $result = $this->file_manager->set_file_as_protected( $attachment_id );
        $this->assertTrue( $result );
    }

    public function test_set_file_as_protected_returns_false_when_already_protected(): void {
        $attachment_id = self::factory()->attachment->create_upload_object( ... );
        $this->file_manager->set_file_as_protected( $attachment_id );
        $result = $this->file_manager->set_file_as_protected( $attachment_id );
        $this->assertFalse( $result );
    }
}

Key Testing Patterns

Reset singleton between tests:

Plugin is a singleton. Reset via reflection when needed:

$reflection = new \ReflectionClass( Plugin::class );
$property = $reflection->getProperty( 'instance' );
$property->setAccessible( true );
$property->setValue( null, null );

Test file operations with the WordPress attachment factory:

$attachment_id = self::factory()->attachment->create_upload_object(
    '/path/to/test/image.jpg',
    0 // parent post ID
);

Verify post meta:

$this->assertSame( '1', get_post_meta( $attachment_id, '_restricted_file', true ) );
$this->assertNotEmpty( get_post_meta( $attachment_id, '_protected_file_hash', true ) );

Test URL modifications:

$url = wp_get_attachment_url( $attachment_id );
$this->assertStringContains( 'protected-files/', $url );

Save/restore globals:

Session and file-serving code may read $_GET, $_SERVER. Save and restore in setUp/tearDown:

private array $original_server;

public function setUp(): void {
    parent::setUp();
    $this->original_server = $_SERVER;
}

public function tearDown(): void {
    $_SERVER = $this->original_server;
    parent::tearDown();
}

No placeholder assertions:

Every test method must have a meaningful assertion. Do not use $this->assertTrue( true ) as a placeholder.

Test Naming Convention

test_<action>_<condition>_<expected_result>

Examples:

• test_set_file_as_protected_returns_true_for_new_file
• test_set_file_as_unprotected_returns_false_when_not_restricted
• test_modify_attachment_url_returns_hash_url_for_protected_file
• test_handle_protected_file_returns_gif_for_logged_out_user
• test_restrict_file_endpoint_returns_403_when_disabled

Procedure: Adding Tests for a New Feature

1. Determine if the feature needs integration tests, E2E tests, or both.
2. Integration: Create tests/Integration/<Name>Test.php. Test the PHP logic in isolation (file operations, meta, hooks, filters, REST endpoints).
3. E2E (Codeception): Create tests/EndToEnd/<Name>Cest.php. Test user-facing behavior in the browser (media library, restriction toggle, file access).
4. Follow the naming and namespace conventions above.
5. Run the full suite to verify no regressions: npm run tests:run.

Verification

• All tests pass: composer tests:run:integration.
• No placeholder assertions (assertTrue( true )).
• New code has corresponding test coverage.
• Tests are isolated — no test depends on another test's side effects.
• Global state ($_GET, $_SERVER) is saved/restored.
• Singletons are properly reset between tests.