{
  "output": "Successfully created and wrote to new file: /Users/bob/git/dxw/aws-stuff/tests/test_bills.py. Here is the updated code:\nimport unittest\nfrom unittest.mock import MagicMock\nfrom audits.bills import fetch_bills\n\nclass TestBillsAudit(unittest.TestCase):\n    def test_fetch_bills(self):\n        mock_ce = MagicMock()\n        \n        # Mock response for one range\n        mock_ce.get_cost_and_usage.return_value = {\n            \"ResultsByTime\": [\n                {\n                    \"Groups\": [\n                        {\n                            \"Keys\": [\"123456789012\"],\n                            \"Metrics\": {\n                                \"UnblendedCost\": {\"Amount\": \"100.0\", \"Unit\": \"USD\"},\n                                \"AmortizedCost\": {\"Amount\": \"90.0\", \"Unit\": \"USD\"},\n                            }\n                        }\n                    ]\n                }\n            ]\n        }\n        \n        ranges = [(\"2023-10-01\", \"2023-11-01\", \"2023-10\")]\n        \n        results = fetch_bills(mock_ce, ranges)\n        \n        self.assertIn(\"123456789012\", results)\n        self.assertEqual(results[\"123456789012\"][\"unblended\"], [100.0])\n        self.assertEqual(results[\"123456789012\"][\"amortized\"], [90.0])\n\nif __name__ == \"__main__\":\n    unittest.main()\n"
}