Collections : Test cases are not there for this router

[nishika26]

Description:
The /collections router is lacking test cases to ensure proper functionality and coverage. This router handles collection-related actions such as managing the vector store and assistant, but there are no existing test cases that validate its behavior.

Expected Behavior:

• Proper unit and integration tests should be created for the /collections endpoint to test its functionality, including:

• Validating if the collection is created correctly for the given document ID.

• Ensuring that vector store and assistant configurations are being set up as expected.

• Verifying that the system behaves as expected when provided with valid and invalid data.