MG-888 - Add certs API tests

[felixgateru]

What type of PR is this?

This is a feature because it adds api tests for the certs service.

What does this do?

This pr introduces /certs/api/endpoint_test.go file for api tests.

Which issue(s) does this PR fix/relate to?

• Related Issue #888

Have you included tests for your changes?

Yes, the test file is the change.

Did you document any new/modified feature?

No,

Notes