public function test_create_student_with_matter_completed()
{
$student = factory(Student::class)->create();
$classroom = factory(Classroom::class)->create();
$matter = factory(Matter::class)->create();
$classroomMatter = factory(ClassroomMatter::class)->create(['classroom_id' => $classroom->id, 'matter_id' => $matter->id]);
$student->classrooms()->attach($classroom);
$student->matterCompleteds()->attach($classroomMatter);
$this->assertInstanceOf(ClassroomMatter::class, $student->matterCompleteds->first());
$this->seeInDatabase('classroom_matter_student_completed', ['student_id' => $student->id, 'classroom_matter_id' => $classroomMatter->id]);
}