Enhance tests for v1b3 event type, new attrs

[matzew]

Proposed Changes

• 🎁 Add test for v1b3 type validation

Pre-review Checklist

• At least 80% unit test coverage
• E2E tests for any new behavior
• Docs PR for any user-facing impact
• Spec PR for any new API feature
• Conformance test for any change to the spec

Release Note

Docs

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.65%. Comparing base (1708881) to head (c135e9b).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8197   +/-   ##
=======================================
  Coverage   66.65%   66.65%           
=======================================
  Files         371      371           
  Lines       18259    18259           
=======================================
  Hits        12170    12170           
  Misses       5310     5310           
  Partials      779      779           

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[matzew]

/test unit-tests

[creydr]

/lgtm

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: creydr, matzew

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