AddTest::test_collection_supports_callables PHP Метод

    public function test_collection_supports_callables()
    {
        $col = new Collection('callable');
        $col = $col->add(function () {
        });
        $col = $col->add([$col, 'add']);
        $col = $col->add(new Invoker());
        $this->assertEquals(3, $col->count());
    }