test(core): add regression tests for dereference_refs cycles and all…

[Mdzub7]

Context

• Adds two regression tests for JSON Schema dereferencing:
  1. Three-node mixed-$ref cycle (A→B→C→A) ensuring termination and sibling metadata retention.
  2. allOf + $ref composition to ensure dereferencing preserves sibling parts.

Why

• core: dereference_refs seems to lead to infinite recursion #32511 reports infinite recursion with mixed $ref objects.
• fix(core): resolve infinite recursion in _dereference_refs_helper with mixed $ref objects #32578 introduces the fix; these tests broaden coverage (multi-node cycle + allOf).

Notes

• Unit-level tests; fast; no external services.
• Verified locally: both tests pass on fix(core): resolve infinite recursion in _dereference_refs_helper with mixed $ref objects #32578.

Refs

• Issue: core: dereference_refs seems to lead to infinite recursion #32511
• Fix PR: fix(core): resolve infinite recursion in _dereference_refs_helper with mixed $ref objects #32578

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1 Skipped Deployment

Project	Deployment	Preview	Comments	Updated (UTC)
langchain	Ignored	Preview		Aug 21, 2025 6:09pm

[codspeed-hq]

CodSpeed WallTime Performance Report

Merging #32643 will not alter performance

_{Comparing Mdzub7:tests/json-schema-recursion-regressions-32511 (5f8f776) with master (b825f85)}

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

Summary

✅ 13 untouched benchmarks

[codspeed-hq]

CodSpeed Instrumentation Performance Report

Merging #32643 will not alter performance

_{Comparing Mdzub7:tests/json-schema-recursion-regressions-32511 (5f8f776) with master (b825f85)}

Summary

✅ 14 untouched benchmarks

[eyurtsev]

Added more unit tests in the PR: #32578