Create Pytest Fixtures and Parametrized Tests for Comprehensive Coverage

Write a complete pytest test suite for a [PYTHON_MODULE_NAME] module that contains the following functions/classes: [FUNCTION_OR_CLASS_LIST]. The module's primary responsibility is [MODULE_PURPOSE]. Please generate the following: 1. **Fixtures** (in a conftest.py file): - A session-scoped fixture that initializes [SHARED_RESOURCE] (e.g., database connection, API client, test configuration) - A function-scoped fixture that provides [TEST_DATA_DESCRIPTION] and properly tears down after each test - A fixture that mocks [EXTERNAL_DEPENDENCY] using unittest.mock or pytest-mock, returning realistic fake responses - Use `yield` for fixtures requiring cleanup and document why each scope was chosen 2. **Parametrized Tests** using @pytest.mark.parametrize: - Test [FUNCTION_NAME] with at least 6 parameter sets covering: valid input, boundary values, empty/null input, type mismatches, large input, and [DOMAIN_SPECIFIC_EDGE_CASE] - Use descriptive test IDs via the `ids` parameter for readable test output - Include indirect parametrize for fixtures where appropriate 3. **Test Organization**: - Group related tests in classes (e.g., TestValidInput, TestEdgeCases, TestErrorHandling) - Add markers for slow tests (@pytest.mark.slow) and integration tests - Include at least one test using pytest.raises for expected exceptions with match patterns 4. **Assertions**: Use specific assertions (assert x == y, not just assert x) and include custom failure messages for complex checks. Provide the conftest.py and test file separately with comments explaining the testing strategy.