Domain\Teacher\TeacherTest::test_create_teacher_with_classroom PHP Method

    public function test_create_teacher_with_classroom()
    {
        $teacher = factory(Teacher::class)->create();
        $classroom = factory(Classroom::class)->create(['teacher_id' => $teacher->id]);
        $this->assertInstanceOf(Classroom::class, $teacher->classrooms->first());
    }