Use test to verify trace output

.github/workflows/demo.yml

@@ -87,11 +87,9 @@ jobs:
           DB_USERNAME: root
           DB_PASSWORD: 'null'
         run: |
+          cp /home/runner/work/blueprint/blueprint/tests/fixtures/integration/TraceTest.php tests/Feature/TraceTest.php
+          ls -laR tests
           php artisan migrate:refresh --force
           php artisan blueprint:build /home/runner/work/blueprint/blueprint/tests/fixtures/drafts/readme-example.yaml
-          php artisan test
           php artisan blueprint:trace
-
-      - name: Output the trace
-        working-directory: /home/runner/work/blueprint/laravel${{ matrix.laravel-version }}-example
-        run: cat .blueprint
+          php artisan test

tests/fixtures/integration/TraceTest.php

@@ -0,0 +1,33 @@
+<?php
+
+namespace Tests\Feature;
+
+use PHPUnit\Framework\TestCase;
+
+final class TraceTest extends TestCase
+{
+    public function it_stores_readme_example(): void
+    {
+        $this->assertFileExists('.blueprint');
+
+        $prefix = date('Y_m_d_');
+        $actual = preg_replace(
+            '/database\/migrations\/' . $prefix . '\d{6}/',
+            'database/migrations/',
+            file_get_contents('.blueprint')
+        );
+
+        $this->assertEquals($this->expectedStub(), $actual);
+    }
+
+    private function expectedStub(): string
+    {
+        return <<<STUB
+created: 'app/Http/Controllers/PostController.php database/factories/PostFactory.php database/migrations/_create_posts_table.php app/Models/Post.php tests/Feature/Http/Controllers/PostControllerTest.php app/Events/NewPost.php app/Http/Requests/PostStoreRequest.php app/Jobs/SyncMedia.php app/Mail/ReviewPost.php resources/views/emails/review-post.blade.php resources/views/post/index.blade.php'
+updated: routes/web.php
+models:
+    Post: { title: 'string:400', content: longtext, published_at: 'timestamp nullable', author_id: 'biginteger unsigned' }
+    User: { name: string, email: string, email_verified_at: 'timestamp nullable', password: string, remember_token: 'string:100 nullable' }
+STUB;
+    }
+}