def main(request):
    """
    Handles the request to fetch libraries.

    Args:
        request (dict): Simulated request object.

    Returns:
        dict: A response containing the list of libraries or an empty list if none are available.
    """
    try:
        # Simulated backend logic for fetching libraries
        if "simulate_empty" in request and request["simulate_empty"]:
            libraries = []  # No libraries available
        else:
            libraries = ["Library A", "Library B"]  # Mocked available libraries

        # Ensure consistent response for no results
        response = {"libraries": libraries if libraries else []}

    except Exception as e:
        # Handle any unexpected errors gracefully
        print(f"Error fetching libraries: {e}")
        response = {"libraries": []}

    return response


# Test cases for validation
if __name__ == "__main__":
    test_data = [
        {"input": {"simulate_empty": True}, "expected_output": {"libraries": []}},
        {"input": {"simulate_empty": False}, "expected_output": {"libraries": ["Library A", "Library B"]}},
        {"input": {}, "expected_output": {"libraries": ["Library A", "Library B"]}},
    ]

    for idx, test in enumerate(test_data):
        print(f"Running Test Case {idx + 1}: {test['input']}")
        result = main(test["input"])
        print(f"Output: {result}")
        assert result == test["expected_output"], f"Test Case {idx + 1} Failed"
        print("Test Passed\n")