test(openai): address some type issues in tests

[mdrxy]

nits

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1 Skipped Deployment

Project	Deployment	Preview	Comments	Updated (UTC)
langchain	Ignored	Preview		Aug 19, 2025 4:18am

[codspeed-hq]

CodSpeed WallTime Performance Report

Merging #32601 will degrade performances by 29.05%

_{Comparing mdrxy/openai-rfc-1-0 (f36e014) with cc/1.0/standard_content (d111965)¹}

⚠️ 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

❌ 1 regressions
✅ 12 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
❌	test_import_time[HumanMessage]	211.8 ms	298.6 ms	-29.05%

Footnotes

1. No successful run was found on cc/1.0/standard_content (313ed7b) during the generation of this report, so 823c15c was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

[codspeed-hq]

CodSpeed Instrumentation Performance Report

Merging #32601 will improve performances by 29.01%

_{Comparing mdrxy/openai-rfc-1-0 (f36e014) with cc/1.0/standard_content (d111965)¹}

Summary

⚡ 1 improvements
✅ 10 untouched benchmarks
⁉️ 3 dropped benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
⁉️	test_stream_time	15.9 ms	N/A	N/A
⁉️	test_init_time	3.8 ms	N/A	N/A
⁉️	test_init_time_with_client	5.3 ms	N/A	N/A
⚡	test_stream_time	1,209.3 ms	937.4 ms	+29.01%

Footnotes

1. No successful run was found on cc/1.0/standard_content (313ed7b) during the generation of this report, so 823c15c was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩