```json
{
  "files": [
    "client.py"
  ],
  "edits": [
    "In `client.py`, update the `httpx.Client` instantiation within the `__init__` method to include a default `timeout` value (e.g., `timeout=10.0`).",
    "In `client.py`, wrap the `self.client.get(endpoint)` call inside the `get_data` method with a `try...except` block to catch `httpx.TimeoutException`.",
    "In `client.py`, ensure that `httpx.TimeoutException` is handled by raising a descriptive `RuntimeError` or a custom exception to provide clear feedback to the caller without altering the `get_data` signature."
  ],
  "tests": [
    "test_get_data_success: Mock a successful 200 OK response and verify that `get_data` returns the expected JSON dictionary.",
    "test_get_data_timeout: Mock `httpx.Client.get` to raise `httpx.TimeoutException` and verify that the method raises a `RuntimeError` with a timeout message.",
    "test_get_data_http_error: Mock a 404 or 500 error and verify that `response.raise_for_status()` correctly propagates the exception."
  ],
  "risks": [
    "A hardcoded default timeout may be too restrictive for endpoints that naturally require long processing times (e.g., report generation).",
    "Raising a generic `RuntimeError` might make it difficult for calling code to programmatically distinguish between a timeout and other types of runtime failures.",
    "If the `httpx.Client` is shared across multiple threads, the default timeout applies globally to all requests made by that instance."
  ]
}
```