Add unit test coverage and CI coverage reporting

[abelmilash-msft]

Summary

Adds comprehensive unit tests across 13 test files and enables coverage reporting and enforcement in both CI pipelines and pyproject.toml. Coverage increased from 72% to 93%.

Coverage enforcement is now built into both CI pipelines and the project config: overall coverage must stay at or above 90% (fail_under = 90 in pyproject.toml), and any new code introduced in a PR must also meet 90% (diff-cover).

Test Results

• 1127 passed, 0 failures
• 93% line coverage (up from ~72%)

Changes

Configuration (2 files)

• pyproject.toml: Added [tool.coverage.run] (source = ["src/PowerPlatform"]) and [tool.coverage.report] (fail_under = 90, show_missing = true) to centralize coverage config
• pyproject.toml: Added diff-cover dev dependency for PR-level coverage enforcement

CI Pipelines (2 files)

• .github/workflows/python-package.yml: Added PYTHONPATH=src pytest --cov --cov-report=xml --junitxml=test-results.xml, diff-cover step to enforce 90% on new changes, fetch-depth: 0 for full git history, and artifact upload steps
• .azdo/ci-pr.yaml: Same pytest and diff-cover steps, added PublishTestResults@2 and PublishCodeCoverageResults@2 tasks

New Test Files (6 files)

• test_auth.py: Credential validation, token acquisition (2 tests)
• test_http_client.py: Timeout selection, session routing, retry behavior (15 tests)
• test_http_errors.py: Error response parsing, correlation IDs, transient detection (9 tests)
• test_upload.py: File upload orchestrator, small upload, chunked streaming (50+ tests)
• test_relationships.py: 1:N and M:N relationship CRUD (25+ tests)
• test_records_operations.py: Public records API delegation (30+ tests)

Expanded Test Files (7 files)

• test_odata_internal.py: 36 test classes, 219 tests covering all _ODataClient methods — CRUD, upsert, bulk operations, metadata, caching, picklist resolution, pagination, SQL queries, alternate keys, column management. Includes kwarg correctness audit (json= vs data=), response content validation, and assertion strengthening.
• test_batch_serialization.py: 7 new test classes (26 tests) — dispatch routing for all intent types, changeset validation, metadata resolution, continue-on-error header, MIME parsing edge cases
• test_query_builder.py, test_table_info.py, test_client.py, test_context_manager.py, test_records_operations.py: Docstrings added to existing tests

[Copilot]

Pull request overview

This PR expands the unit test suite to significantly increase coverage across the Dataverse client (including internal OData helpers), and updates both CI pipelines to publish JUnit test results and Cobertura-style coverage XML artifacts.

Changes:

• Added extensive new unit tests for core HTTP/auth, OData internals, upload + relationship helpers, and public operation namespaces.
• Extended existing unit tests to cover additional input validation and internal edge cases.
• Updated GitHub Actions and Azure DevOps pipelines to emit and publish JUnit XML + coverage XML outputs.

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
.github/workflows/python-package.yml	Runs pytest with JUnit + coverage reporting and uploads artifacts.
.azdo/ci-pr.yaml	Runs pytest with JUnit + coverage reporting and publishes results in ADO.
tests/unit/core/test_auth.py	Adds unit tests for credential validation + token acquisition.
tests/unit/core/test_http_client.py	Adds unit tests for timeout defaults, session routing, and retry/backoff.
tests/unit/core/test_http_errors.py	Adds instantiation tests for error types and optional HttpError diagnostic fields.
tests/unit/data/test_odata_internal.py	Adds/extends broad internal _ODataClient coverage (CRUD, metadata, caching, etc.).
tests/unit/data/test_relationships.py	Adds tests for relationship creation including solution header behavior.
tests/unit/data/test_upload.py	Adds comprehensive tests for small/chunk upload paths and orchestration logic.
tests/unit/models/test_query_builder.py	Adds a test for handling plain-string internal filter parts.
tests/unit/models/test_table_info.py	Adds tests for non-string membership checks and legacy values/items behavior.
tests/unit/test_client.py	Adds base URL validation test.
tests/unit/test_context_manager.py	Adds delegation test for DataverseClient.flush_cache().
tests/unit/test_records_operations.py	Adds input/type validation tests for RecordOperations CRUD behaviors.

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[sagebree]

Ensure Azure DevOps pipeline approval is completed so coverage reporting is re-enabled