[ulixius9]

Problem

dbt 2.x (Fusion) writes a unit test's checksum as an object, while the v12 model expects a string, so parse_manifest() fails on any dbt 2.x manifest that contains a unit test:

unit_tests.`unit_test.rich.stg_orders.ut_stg_orders`.checksum
  Input should be a valid string [type=string_type, input_value={'name': 'none', 'checksum': ''}, input_type=dict]

Follow-up to #7; refs open-metadata/OpenMetadata#37570. OpenMetadata dbt ingestion is not affected (it blanks unit_tests before parsing); direct callers of the parser are.

Change

• UnitTests.checksum: Optional[str] → Optional[Union[str, Checksum]] in manifest_v12, manifest_cloud, manifest_cloud_v1, manifest_cloud_v2, reusing the existing Checksum model that nodes use. dbt Core's string form still parses as str.
• Fixture: tests/resources/v12/jaffle_shop/manifest_2.0_unit_tests.json, generated by dbt==2.0.9 (models, seeds, snapshot, sources, tests, unit test, exposure, semantic model + metric), added to TestManifestParser.
• No version bump: OpenMetadata ingestion is unaffected, so this ships with the next release.

Testing

• New cases fail on main with the error above and pass with the fix; full suite pytest tests → 76 passed; pre-commit run --all-files clean.
• Same fixture with the checksum rewritten to a plain string still parses to str.

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