Ouzo\Tests\Mock\Mock::any PHP Метод

    public static function any()
    {
        return new AnyArgument();
    }

 /**
  * @test
  */
 public function shouldNotDisplayOutputBeforeHeadersAreSent()
 {
     //given
     $self = $this;
     $obLevel = ob_get_level();
     Mock::when($this->frontController->getHeaderSender())->send(Mock::any())->thenAnswer(function () use($self, $obLevel) {
         //if there's a nested buffer, nothing was sent to output
         $self->assertTrue(ob_get_level() > $obLevel);
         $self->expectOutputString('OUTPUT');
     });
     Route::allowAll('/sample', 'sample');
     //when
     $this->get('/sample/action');
     //then no exceptions
 }