Complete Coverage for Communities with Tests

# Problem Statement
* **Currently the tests for communities written in community/test.py do not cover all the API calls.**
* **Write tests to test all the API calls for communities, this includes all the CRUD operations for community, posts , reactions.**

# Hints
1. Take reference from the pre existing tests.

# To make sure
1. The format of the new tests should be similar to the already existing ones
2. Keep the code clean
3. Code formatting should be taken into account

Start by reading community/test.py and the pre-existing tests it references to map the current coverage. Add tests for the community, post, and reaction CRUD API calls, keeping their format and code style consistent. Done means all stated API operations are covered and the test suite and formatting checks pass.

Written by the indexing model from the issue text.