Classroom unit test cases

[anuraggoogler]

Description

Classroom UTs of region tags:

classroom_create_course
classroom_get_course
classroom_update_course
classroom_patch_course
classroom_add_teacher
classroom_add_student
classroom_batch_add_students

Has it been tested?

• Development testing done
• Unit or integration test implemented

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have performed a peer-reviewed with team member(s)
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules