Agent Skills: Pest Testing 4

Pest Testing 4

When to Apply

Activate this skill when:

• Creating new tests (unit, feature, or browser)
• Modifying existing tests
• Debugging test failures
• Working with browser testing or smoke testing
• Writing architecture tests or visual regression tests

Documentation

Use search-docs for detailed Pest 4 patterns and documentation.

Basic Usage

Creating Tests

All tests must be written using Pest. Use php artisan make:test --pest {name}.

Test Organization

• Unit/Feature tests: tests/Feature and tests/Unit directories.
• Browser tests: tests/Browser/ directory.
• Do NOT remove tests without approval - these are core application code.

Basic Test Structure

it('is true', function () { expect(true)->toBeTrue(); });

Running Tests

• Run minimal tests with filter before finalizing: php artisan test --compact --filter=testName.
• Run all tests: php artisan test --compact.
• Run file: php artisan test --compact tests/Feature/ExampleTest.php.

Assertions

Use specific assertions (assertSuccessful(), assertNotFound()) instead of assertStatus():

it('returns all', function () { $this->postJson('/api/docs', [])->assertSuccessful(); });

| Use | Instead of | |-----|------------| | assertSuccessful() | assertStatus(200) | | assertNotFound() | assertStatus(404) | | assertForbidden() | assertStatus(403) |

Mocking

Import mock function before use: use function Pest\Laravel\mock;

Datasets

Use datasets for repetitive tests (validation rules, etc.):

it('has emails', function (string $email) { expect($email)->not->toBeEmpty(); })->with([ 'james' => 'james@laravel.com', 'taylor' => 'taylor@laravel.com', ]);

Pest 4 Features

| Feature | Purpose | |---------|---------| | Browser Testing | Full integration tests in real browsers | | Smoke Testing | Validate multiple pages quickly | | Visual Regression | Compare screenshots for visual changes | | Test Sharding | Parallel CI runs | | Architecture Testing | Enforce code conventions |

Browser Test Example

Browser tests run in real browsers for full integration testing:

• Browser tests live in tests/Browser/.
• Use Laravel features like Event::fake(), assertAuthenticated(), and model factories.
• Use RefreshDatabase for clean state per test.
• Interact with page: click, type, scroll, select, submit, drag-and-drop, touch gestures.
• Test on multiple browsers (Chrome, Firefox, Safari) if requested.
• Test on different devices/viewports (iPhone 14 Pro, tablets) if requested.
• Switch color schemes (light/dark mode) when appropriate.
• Take screenshots or pause tests for debugging.

it('may reset the password', function () { Notification::fake();

$this->actingAs(User::factory()->create());

$page = visit('/sign-in');

$page->assertSee('Sign In')
    ->assertNoJavascriptErrors()
    ->click('Forgot Password?')
    ->fill('email', 'nuno@laravel.com')
    ->click('Send Reset Link')
    ->assertSee('We have emailed your password reset link!');

Notification::assertSent(ResetPassword::class);

});

Smoke Testing

Quickly validate multiple pages have no JavaScript errors:

$pages = visit(['/', '/about', '/contact']);

$pages->assertNoJavascriptErrors()->assertNoConsoleLogs();

Visual Regression Testing

Capture and compare screenshots to detect visual changes.

Test Sharding

Split tests across parallel processes for faster CI runs.

Architecture Testing

Pest 4 includes architecture testing (from Pest 3):

arch('controllers') ->expect('App\Http\Controllers') ->toExtendNothing() ->toHaveSuffix('Controller');

Common Pitfalls

• Not importing use function Pest\Laravel\mock; before using mock
• Using assertStatus(200) instead of assertSuccessful()
• Forgetting datasets for repetitive validation tests
• Deleting tests without approval
• Forgetting assertNoJavascriptErrors() in browser tests