Update Product: test if validation error is fired correctly

Now that we have an edit form, let's test that validation works.

Laravel Code

Again, first, the working code.

php artisan make:request UpdateProductRequest

app/Http/Requests/UpdateProductRequest.php:

use Illuminate\Foundation\Http\FormRequest;
 
class UpdateProductRequest extends FormRequest
{
    public function authorize(): bool
    {
        return true;
    }
 
    public function rules(): array
    {
        return [
            'name'  => 'required',
            'price' => 'required',
        ];
    }
}

app/Http/Controllers/ProductController.php:

use Illuminate\Http\RedirectResponse;
use App\Http\Requests\UpdateProductRequest;
 
class ProductController extends Controller
{
    // ...
 
    public function update(UpdateProductRequest $request, Product $product): RedirectResponse
    {
        $product->update($request->validated());
 
        return redirect()->route('products.index');
    }
}

The Test

The PUT request is used for updating, so in the test, again acting as an admin, we send a PUT request with empty values.

tests/Feature/ProductsTest.php:

class ProductsTest extends TestCase
{
    // ...
 
    public function test_product_update_validation_error_redirects_back_to_form()
    {
        $product = Product::factory()->create();
 
        $response = $this->actingAs($this->admin)->put('products/' . $product->id, [
            'name' => '',
            'price' => ''
        ]);
    }
 
    private function createUser(bool $isAdmin = false): User
    {
        return User::factory()->create([
            'is_admin' => $isAdmin,
        ]);
    }
}

And now, we need to assert. We can first assert that the response is a redirect. And then Laravel has an assertion just for validatiing errors assertInvalid.

tests/Feature/ProductsTest.php:

class ProductsTest extends TestCase
{
    // ...
 
    public function test_product_update_validation_error_redirects_back_to_form()
    {
        $product = Product::factory()->create();
 
        $response = $this->actingAs($this->admin)->put('products/' . $product->id, [
            'name' => '',
            'price' => ''
        ]);
    }
 
    private function createUser(bool $isAdmin = false): User
    {
        return User::factory()->create([
            'is_admin' => $isAdmin,
        ]);
 
        $response->assertStatus(302); 
        $response->assertInvalid(['name', 'price']); 
    }
}

Another assertion to assert validation can be used is assertSessionHasErrors. In the same way as in assertInvalid, we need to provide keys.

tests/Feature/ProductsTest.php:

class ProductsTest extends TestCase
{
    // ...
 
    public function test_product_update_validation_error_redirects_back_to_form()
    {
        $product = Product::factory()->create();
 
        $response = $this->actingAs($this->admin)->put('products/' . $product->id, [
            'name' => '',
            'price' => ''
        ]);
    }
 
    private function createUser(bool $isAdmin = false): User
    {
        return User::factory()->create([
            'is_admin' => $isAdmin,
        ]);
 
        $response->assertStatus(302);
        $response->assertInvalid(['name', 'price']);
        $response->assertSessionHasErrors(['name', 'price']); 
    }
}

edit product form validation test

Commit for this lesson

Edit Product: Testing correct values in form inputs Delete Product: test if it's actually removed from database

Course Content

Testing in Laravel 9 For Beginners: PHPUnit, Pest, TDD

Update Product: test if validation error is fired correctly

Laravel Code

The Test

Course Content

Intro

Practical Project: Testing of CRUD

So, What Should We Test?

PEST Example

TDD Example

What's Next?