domain\classroom\MatterCompletedServiceTest::test_attach PHP Method

    public function test_attach()
    {
        //set
        $classroom = factory(Classroom::class)->create();
        $matters = factory(Matter::class, 10)->create();
        $students = factory(Student::class, 4)->create();
        $students->each(function ($student) use($classroom) {
            $classroom->students()->attach($student);
        });
        $matters->each(function ($matter) use($classroom) {
            $classroom->matters()->attach($matter);
        });
        $service = App::make(MatterCompletedService::class);
        //expect
        $attach = [];
        foreach ($classroom->matters as $matter) {
            $attach[] = ['id' => $matter->pivot->id];
        }
        $response = $service->attach($attach);
        //assert
        $this->assertTrue($response);
        foreach ($attach as $id) {
            foreach ($students as $student) {
                $this->seeInDatabase('classroom_matter_student_completed', ['classroom_matter_id' => $id, 'student_id' => $student->id]);
            }
        }
    }