Subscriptions test

[paologalligit]

Description

Added api/subscriptions tests, increasing the coverage to 82.2%.

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes
• [x] New and existing E2E tests pass locally with my changes
• [x] Any dependent changes have been merged and published in downstream modules
• [x] I have not added any vulnerable dependencies to my code

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 57.86%. Comparing base (e42227b) to head (40b5576). Report is 7 commits behind head on master.

:exclamation: Current head 40b5576 differs from pull request most recent head 0c737fb. Consider uploading reports for the commit 0c737fb to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #687 +/- ## ========================================== + Coverage 57.27% 57.86% +0.58% ========================================== Files 156 164 +8 Lines 17218 17846 +628 ========================================== + Hits 9862 10326 +464 - Misses 6392 6511 +119 - Partials 964 1009 +45 ```

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