Domain\Matter\MatterTest::test_create_matter_with_classroom PHP 메소드

    public function test_create_matter_with_classroom()
    {
        $matter = factory(Matter::class)->create();
        $classroom = factory(Classroom::class)->create();
        $matter->classrooms()->attach($classroom);
        $this->assertInstanceOf(Matter::class, $matter);
        $this->assertInstanceOf(Classroom::class, $matter->classrooms->first());
    }