assertTrue($this->app['tail.registered']); $this->assertTrue($this->app['tail.booted']); } } class HeadServiceProvider extends ServiceProvider { public function register() { // } public function boot() { $this->app->register(TailServiceProvider::class); } } class TailServiceProvider extends ServiceProvider { public function register() { $this->app['tail.registered'] = true; } public function boot() { $this->app['tail.booted'] = true; } }