Domain\Lesson\LessonTest::test_create_lesson_with_matter PHP Method

    public function test_create_lesson_with_matter()
    {
        $lesson = factory(Lesson::class)->create();
        $matter = factory(Matter::class)->create();
        $lesson->matters()->attach($matter);
        $this->assertInstanceOf(Lesson::class, $lesson);
        $this->assertInstanceOf(Matter::class, $lesson->matters->first());
    }