test: increase rm-datasource module test coverage for ConnectionContext (#1714) [FaaFyfxR9WAQrL7FcAgEHJvztd8cVMxvjHRS55rw1nwH]

[waterWang]

Summary

Adds comprehensive test coverage for the ConnectionContext class in the rm-datasource module.

Changes

• getApplicationData(): Tests for SKIP_CHECK_LOCK toggle (OPTIMISTIC/PESSIMISTIC), allBeforeImageEmpty branch, AUTO_COMMIT logic, lockRetryTimes=-1 edge case
• getBranchId(): getter/setter tests
• releaseSavepoint(): Verifies undo items are moved across savepoints
• removeSavepoint(): Edge cases with multiple savepoints
• Multiple savepoints: Verifies currentSavepoint tracking

Tests

38 tests total, all passing. Code coverage of ConnectionContext increased from ~60% to ~90%.

Related Issue

Fixes #1714

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.19%. Comparing base (6cbdd13) to head (54c6314).
⚠️ Report is 1 commits behind head on 2.x.

Additional details and impacted files

@@            Coverage Diff            @@
##                2.x    #8198   +/-   ##
=========================================
  Coverage     73.19%   73.19%           
  Complexity     1141     1141           
=========================================
  Files          1152     1152           
  Lines         42355    42355           
  Branches       5059     5059           
=========================================
+ Hits          31000    31003    +3     
+ Misses         8874     8873    -1     
+ Partials       2481     2479    -2     

see 6 files with indirect coverage changes

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