fix(channel-test): honor Responses compatibility policy

[linjzy]

⚠️ 提交说明 / PR Notice

Important

• 请提供人工撰写的简洁摘要，避免直接粘贴未经整理的 AI 输出。

Note

AI-assisted disclosure: 此实现和初始 PR 草稿由 OpenAI Codex 在仓库所有者请求下协助完成；仓库所有者已人工确认变更内容和影响范围。

📝 变更描述 / Description

渠道测试在未显式选择 endpoint 时，会处理 Compact 模型和 Codex 渠道，但没有复用正常转发链路的 chat_completions_to_responses_policy。因此命中该策略的渠道和模型在实际请求中走 Responses API，渠道测试却仍可能走 Chat Completions 并误报失败。

本变更让 endpoint 自动选择调用现有全局兼容策略：只有渠道和模型同时命中时才选择 Responses；显式 endpoint 仍具有最高优先级，Compact 与 Codex 的既有行为不变。测试覆盖命中、模型不匹配、渠道不匹配和显式 endpoint 覆盖场景。

🚀 变更类型 / Type of change

• 🐛 Bug 修复 (Bug fix) - 请关联对应 Issue，避免将设计取舍、理解偏差或预期不一致直接归类为 bug
• ✨ 新功能 (New feature) - 重大特性建议先通过 Issue 沟通
• ⚡ 性能优化 / 重构 (Refactor)
• 📝 文档更新 (Documentation)

🔗 关联任务 / Related Issue

• Closes fix: make channel tests honor the Responses compatibility policy #6293

✅ 提交前检查项 / Checklist

• 人工确认: 我已亲自整理并撰写此描述，没有直接粘贴未经处理的 AI 输出。
• 非重复提交: 我已搜索现有的 Issues 与 PRs，确认不是重复提交。
• Bug fix 说明: 已关联 fix: make channel tests honor the Responses compatibility policy #6293；该问题会让渠道测试与正常转发策略不一致并产生误报。
• 变更理解: 我已理解这些更改的工作原理及可能影响。
• 范围聚焦: 本 PR 未包含任何与当前任务无关的代码改动。
• 本地验证: 已在本地运行并通过测试或手动验证，维护者可以据此复核结果。
• 安全合规: 代码中无敏感凭据，且符合项目代码规范。

📸 运行证明 / Proof of Work

以下命令已通过：

go test ./controller

[coderabbitai]

Walkthrough

Channel test endpoint normalization now applies the global Responses compatibility policy for matching channel and model combinations. Unit tests cover matching and non-matching policy inputs, global-state cleanup, and preservation of explicitly supplied endpoints.

Changes

Channel test endpoint selection

Layer / File(s)	Summary
Responses policy normalization and tests controller/channel-test.go, controller/channel_test_endpoint_test.go	normalizeChannelTestEndpoint selects EndpointTypeOpenAIResponse when the channel and model match the global compatibility policy. Tests cover matching and non-matching inputs and preserve explicit endpoints.

Estimated code review effort: 2 (Simple) | ~10 minutes

Poem

I’m a rabbit with endpoints neat,
Responses now guide each test’s feet.
Matching models hop the right way,
Explicit paths stay where they lay.
Green tests nibble bugs away.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The PR matches #6293 by honoring the Responses compatibility policy while preserving explicit endpoint and existing priority rules.
Out of Scope Changes check	✅ Passed	The changes are tightly scoped to endpoint normalization and its tests, with no clear unrelated additions.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the main change: channel-test now honors the Responses compatibility policy.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@controller/channel_test_endpoint_test.go`:
- Around line 10-55: Replace the non-fatal value assertions in
TestNormalizeChannelTestEndpointUsesResponsesCompatibilityPolicy and
TestNormalizeChannelTestEndpointKeepsExplicitEndpoint with testify/assert
equivalents, updating the import accordingly; reserve require for setup or fatal
assertions only.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 8e0c5346-39de-4f12-8167-ddebfec7ddfe

📥 Commits

Reviewing files that changed from the base of the PR and between 5a6c53d and 953704e.

📒 Files selected for processing (2)

• controller/channel-test.go
• controller/channel_test_endpoint_test.go