Unit Test Generation

Act as a QA Engineer. Write unit tests for the following Javascript function using the Jest framework.

Function: [PASTE FUNCTION HERE]

Requirements:

1. Test the 'Happy Path' (standard success).
2. Test 3 Edge Cases (null inputs, empty strings, negative numbers).
3. Mock any external API calls referenced in the function.
4. Ensure 100% code coverage.

Output:

• A complete executable test file code block.