public function testGetCourseByDepartment() { $all_courses = Course::all()->random(10); foreach ($all_courses as $target_course) { $query_restrict = $target_course->course_department . "," . $target_course->course_grade; $course1 = $this->repository->searchCourse("department", $query_restrict)->pluck('id'); $this->assertContains($target_course->id, $course1); } }