Test worldwide text encoding round trips

[priyankatiwari08]

Summary

• add representative worldwide Unicode round-trip coverage for normal and streamed parameters, SQL Server storage, buffered and sequential readers, and sync/async paths
• validate UTF-8-collated varchar(max) values by both ordinal text equality and exact stored bytes across 512-byte packet boundaries
• strengthen UTF-8 bulk-copy coverage with multilingual data while preserving sync/async, MARS, and streaming combinations

Validation

• Tests added or updated
• Public API changes documented — N/A; no public API changes
• Verified against customer repro — N/A; compliance validation task
• Ensure no breaking changes introduced

Focused 14-test suite passed on Windows for net462, net8.0, net9.0, and net10.0. Focused plus existing globalization coverage passed 21/21 on net8.0.

Azure DevOps: Task 45861 — Validate Correct Text and Data Encoding

[Copilot]

🟢 Approval recommended

The focused test additions are complete, consistent with existing infrastructure, and introduce no unresolved issues.

Pull request overview

Adds comprehensive Unicode and UTF-8 round-trip validation across parameters, readers, packet boundaries, and bulk copy.

Changes:

• Adds worldwide text coverage for sync/async and buffered/streamed paths.
• Expands UTF-8 bulk-copy tests with multilingual data and exact byte validation.

File summaries

File	Description
GlobalizationEncodingTests.cs	Adds Unicode and UTF-8 round-trip tests.
TestBulkCopyWithUTF8.cs	Strengthens UTF-8 bulk-copy coverage.

Review details

• Files reviewed: 2/2 changed files
• Comments generated: 0
• Review effort level: Balanced

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.61%. Comparing base (7054399) to head (190152a).
⚠️ Report is 27 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4662      +/-   ##
==========================================
- Coverage   65.92%   64.61%   -1.31%     
==========================================
  Files         290      284       -6     
  Lines       44987    67980   +22993     
==========================================
+ Hits        29656    43928   +14272     
- Misses      15331    24052    +8721     

Flag	Coverage Δ
CI-SqlClient	?
PR-SqlClient-Project	64.61% <ø> (?)

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