nic-6443 opened a new pull request, #13234:
URL: https://github.com/apache/apisix/pull/13234
### Description
This replaces inline `content_by_lua_block` mock servers across all AI test
files with a centralized fixture-based system, cutting ~1200 lines of
duplicated mock code.
Tests now specify mock responses via the `X-AI-Fixture` request header,
pointing to static fixture files in `t/fixtures/`.
### What changed
**Infrastructure:**
- `t/lib/fixture_loader.lua`: loads fixture files, auto-detects Content-Type
(.json/.sse), supports `{{model}}` template substitution and
`X-AI-Fixture-Status` for custom status codes
- `t/lib/server.lua`: added AI endpoints (v1_chat_completions, v1_messages,
v1_embeddings, v1_responses, delay_v1_chat_completions, etc.) that dispatch to
fixture_loader
- `t/fixtures/`: 31 fixture files organized by provider (openai, anthropic,
protocol-conversion, vertex-ai, aliyun, prometheus)
**22 test files converted** from inline mocks to fixture-based approach.
**Files kept with inline mocks** (require dynamic/stateful behavior):
- ai-proxy-multi.balancer.t, ai-proxy-multi3.t
- ai-aliyun-content-moderation.t (moderation endpoint)
- ai-proxy.t TEST 20/22/23/24b (header forwarding), TEST 31 (fragmented SSE)
### How it works
```
Before: server { listen 6724; content_by_lua_block { ... 50+ lines ... } }
After: --- more_headers\n X-AI-Fixture: openai/chat-basic.json
```
The fixture loader reads the file and serves it with the correct
Content-Type. The `{{model}}` template gets replaced with the model from the
request body at serve time.
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