Test Error Handling for readAllUserDataFiles Function

[emmalgs]

Ticket: Test Error Handling for readAllUserDataFiles Function

What it is: Write a test case to verify the error handling behavior of the readAllUserDataFiles function when reading user data files encounters an error.

Context: Testing error handling ensures that the function responds appropriately when any part of the reading process fails.

Acceptance Criteria:

• Inside the describe block for readAllUserDataFiles, write a test case with an appropriate description (e.g., "should handle error when reading user data files").
• Utilize Jest's mock functions to simulate an error scenario for fs.readdir and readUserDataFile.
• Use the expect function to verify that the function rejects with the expected error when any part of the reading process fails.

By completing these tickets, you will have comprehensive tests for the readAllUserDataFiles function in your FileSystemService. This will help ensure that the function performs as expected in both successful and error scenarios.