Fork test: PR #1347 - Add valid string case check (#1335)

[ghanse]

Automated sync from fork PR for CI testing.

Original PR: #1347

All tests, including unit and integration tests run on this PR (they are skipped for fork PRs).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.89%. Comparing base (1b03ba0) to head (0c37062).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1375      +/-   ##
==========================================
+ Coverage   92.77%   92.89%   +0.12%     
==========================================
  Files         102      103       +1     
  Lines       10554    10702     +148     
==========================================
+ Hits         9791     9942     +151     
+ Misses        763      760       -3     

Flag	Coverage Δ
anomaly	53.54% <18.18%> (-0.30%)	⬇️
anomaly-serverless	53.55% <18.18%> (-0.30%)	⬇️
integration	51.08% <72.72%> (+4.80%)	⬆️
integration-serverless	50.93% <72.72%> (+0.07%)	⬆️
unit	59.81% <72.72%> (+0.65%)	⬆️

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[github-actions]

✅ 1/1 passed, 17m32s total

_{Running from mcp #102}

[github-actions]

✅ 871/871 passed, 50 skipped, 5h56m48s total

_{Running from acceptance #5289}

[github-actions]

✅ 194/194 passed, 2 skipped, 7h18m18s total

_{Running from anomaly #1403}