Description

• Add RSpec automated tests for the API routes GET /api/v1/assignments/{assignment_id}/submission_similarities/ and
  GET /api/v1/assignments/{assignment_id}/submission_similarities/{submission_similarity_id}
• Bug fixes for the two API routes

Related Issue

#324
#350
#351

Motivation and Context

Part of #324

How Has This Been Tested?

Wrote automated RSpec tests + local testing

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.