Test Positive Case for readAllUserDataFiles Function

[emmalgs]

Ticket: Test Positive Case for readAllUserDataFiles Function

What it is: Write a test case to verify the positive case of the readAllUserDataFiles function, where all user data files are read successfully.

Context: Testing the positive case of this function ensures that it correctly processes and aggregates data from all user data files.

Acceptance Criteria:

• Inside the describe block for readAllUserDataFiles, write a test case with an appropriate description (e.g., "should read and return data for all user data files").
• Utilize Jest's mock functions to simulate successful behavior for fs.readdir and readUserDataFile.
• Use the expect function to verify that the function returns the expected data (an array of user data objects) when all user data files are read successfully.