Nestable\Tests\Services\NestableServiceTest::testIsValidForJson PHP Метод

    public function testIsValidForJson()
    {
        $nestable = new \Nestable\Services\NestableService();
        $nested = $nestable->make($this->categories);
        $this->assertTrue($nested->isValidForJson());
        $nested = $nested->isValidForJson(true);
        json_decode($nested);
        $this->assertLessThan(1, json_last_error());
        $this->assertTrue($nested != json_encode($this->categories));
    }