Enhance Qualer SDK with new features and fixes

[rhythmatician]

Introduce parameterized integration tests for various SDK endpoints, improve handling of nullable fields and enum types, and streamline the AuthenticatedClient initialization. Remove redundant test files and ensure integration tests skip if the API key is not set.

[Copilot]

Pull Request Overview

Enhance the Qualer SDK by replacing an outdated clean-up test, adding a parameterized integration test suite, and improving model nullability and enum handling.

• Removed the obsolete test_regenerate_sdk_clean.py.
• Introduced tests/test_endpoints_integration.py with parameterized integration tests that skip when the API key is unset.
• Streamlined test_all_get_endpoints.py to simplify client initialization.
• Updated SDK models to support nullable date/time fields, switch enums to IntEnum, and robustly parse nullable values.
• Extended spec.json with x-nullable flags and correct integer enum formats.

Reviewed Changes

Copilot reviewed 23 out of 23 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tests/test_regenerate_sdk_clean.py	Entirely removed outdated clean-up tests.
tests/test_endpoints_integration.py	Added comprehensive, parameterized GET endpoint tests.
tests/test_all_get_endpoints.py	Simplified AuthenticatedClient initialization and logs.
src/qualer_sdk/models/…	Added None support to datetime fields; converted enums to integer-based types; updated parsing logic.
spec.json	Marked fields as x-nullable; changed string enums to integer enums.

Comments suppressed due to low confidence (3)

src/qualer_sdk/models/qualer_api_models_report_datasets_to_measurement_field_response_batch_type.py:4

• [nitpick] Enum members are now named generically (VALUE_0, VALUE_1, VALUE_2), losing semantic clarity. Consider using names derived from x-enumNames (e.g., UNSET, AS_FOUND, AS_LEFT) to preserve readability for API consumers.

class QualerApiModelsReportDatasetsToMeasurementFieldResponseBatchType(IntEnum):

tests/test_all_get_endpoints.py:179

• AuthenticatedClient is now called with only the API token, but earlier code and other tests expect both a base_url and token. Update this call to match the client constructor signature (e.g., AuthenticatedClient(base_url, token=api_token)).

    client = AuthenticatedClient(api_token)

tests/test_endpoints_integration.py:836

• Providing a default value here overrides the sample_client_company_id fixture. Remove the =57071 default so pytest will inject the fixture correctly.

def test_client_company_id_endpoint_response_parsing(

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