Inheritance: extends Illuminate\Support\Manager
 /**
  * Handle an incoming request.
  *
  * @param  \Illuminate\Http\Request  $request
  * @param  \Closure  $next
  * @param  string|null  $guard
  * @return  mixed
  */
 public function handle($request, Closure $next, $guard = null)
 {
     $locale = $this->determinerManager->determineLocale($request);
     $this->app->setLocale($locale);
     return $next($request);
 }
 public function testThatItReturnsADefaultDeterminer()
 {
     $manager = new DeterminerManager($this->app);
     $this->assertInstanceOf(Determiners\DeterminerInterface::class, $manager->driver());
 }