9 - Refactor into a data provider

9-refactor-into-a-data-provider.php

<?php
...
class AddCustomTagsTest extends TestCase
{
    public function validationDataProvider(): array
    {
        return [
            // uniqueness
            ['tags' => ['tag1', 'Tag1'], 'errors' => ['custom_tags.0', 'custom_tags.1']],
            // min length 3
            ['tags' => ['ta'], 'errors' => ['custom_tags.0']],
            // max length 100
            ['tags' => [str_repeat('a', 101)], 'errors' => ['custom_tags.0']],
            // max 3 tags
            ['tags' => ['tag1', 'tag2', 'tag3', 'tag4'], 'errors' => ['custom_tags']],
        ];
    }

    /**
     * @dataProvider validationDataProvider
     */
    public function test_it_validates_the_custom_tags($tags, $errors)
    {
        $user = User::factory()->create();
        $this->actingAs($user, 'api')->post('/api/photos/submit', $this->photo());
        $photo = $user->fresh()->photos->last();

        $response = $this->postJson('/api/add-tags', [
            'photo_id' => $photo->id,
            'custom_tags' => $tags
        ]);

        $response->assertStatus(422);
        $response->assertJsonValidationErrors($errors);
        $this->assertCount(0, $photo->fresh()->customTags);
    }
}