ChatGPT prompt for generating Python unit tests for an existing function

Act as a senior Python test engineer who follows best practices for pytest. I have a function that I need comprehensive unit tests for. Here is the function: ```python [paste your function here] ``` Dependencies/context: - Framework: [pytest / unittest] - The function is in module: [module_path] - External dependencies it uses: [list any DB calls, APIs, file I/O] - Known edge cases: [list any you know about] Generate tests that cover: 1. Happy path — normal expected inputs and outputs (at least 3 cases) 2. Edge cases — empty inputs, None values, boundary values, maximum sizes 3. Error cases — invalid types, missing required args, expected exceptions 4. If the function calls external services, mock them properly using unittest.mock or pytest-mock Requirements: - Use pytest style (not unittest classes) unless I specified otherwise - Use parametrize for similar test cases - Each test function should have a clear docstring explaining what it tests - Include fixtures where appropriate - Add comments explaining non-obvious test logic - Name tests descriptively: test_functionname_scenario_expected Output: - Complete test file ready to run - Brief explanation of test coverage and any gaps - Suggested additional tests if the function were to be extended