[11.x] Add assertion for check provider added to provider.php (#50049)

* [11.x] Add test for check provider added to file when use make command

* fix style

Author: saeedhosseiinii

tests/Integration/Generators/ProviderMakeCommandTest.php

@@ -20,5 +20,9 @@ public function testItCanGenerateServiceProviderFile()
             'public function register()',
             'public function boot()',
         ], 'app/Providers/FooServiceProvider.php');
+
+        $this->assertEquals(require $this->app->getBootstrapProvidersPath(), [
+            'App\Providers\FooServiceProvider',
+        ]);
     }
 }