GH-48941: [C++] Generate proper UTF-8 strings in JSON test utilities #48943
+72
−7
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Rationale for this change
The JSON test utility
GenerateUtf8was only generating ASCII characters. Should better have the test coverage for proper UTF-8 and Unicode handling.What changes are included in this PR?
Replaced ASCII-only generation with proper UTF-8 string generation that produces valid Unicode scalar values across all planes (BMP, SMP, SIP, planes 3-16), correctly encoded per RFC 3629.
Are these changes tested?
There are existent tests for JSON.
Are there any user-facing changes?
No, test-only.