[yaml] : Add final expand pipeline ut

[derrickaw]

Fixes #36086

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[gemini-code-assist]

Summary of Changes

Hello @derrickaw, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the testing coverage for Apache Beam's YAML pipeline expansion feature. It introduces new unit tests to specifically validate the expand_pipeline function's schema validation capabilities, ensuring that both valid and invalid YAML pipeline definitions are handled appropriately. This helps maintain the integrity and reliability of YAML-based pipeline construction.

Highlights

• YAML Pipeline Schema Validation: Added unit tests to verify the expand_pipeline function's behavior when validating YAML pipeline definitions against a schema.
• Valid Schema Test Case: Introduced test_expand_pipeline_with_valid_schema to confirm that pipelines with correctly structured YAML are expanded without errors when schema validation is enabled.
• Invalid Schema Test Case: Implemented test_expand_pipeline_with_invalid_schema to ensure that expand_pipeline correctly raises a jsonschema.ValidationError when processing YAML definitions that do not conform to the expected schema.

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[derrickaw]

Failures don't seem related

[derrickaw]

Run Xlang_Generated_Transforms PreCommit 3.10

[github-actions]

Checks are failing. Will not request review until checks are succeeding. If you'd like to override that behavior, comment assign set of reviewers

[derrickaw]

Run Python_Runners PreCommit 3.10

[derrickaw]

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[derrickaw]

Run Prism_Python PreCommit 3.10

[derrickaw]

Run Prism_Python PreCommit 3.13

[derrickaw]

Run Python_PVR_Flink PreCommit

[derrickaw]

Run Xlang_Generated_Transforms PreCommit 3.10

[derrickaw]

Run Python_PVR_Flink PreCommit