Scientist\Experiment::matcher PHP Метод

    public function matcher(Matcher $matcher)
    {
        $this->matcher = $matcher;
        return $this;
    }

 public function test_that_an_experiment_matcher_can_be_set()
 {
     $e = new Experiment('test experiment');
     $e->matcher(new StandardMatcher());
     $this->assertInstanceOf(StandardMatcher::class, $e->getMatcher());
 }