Add tests/tools/test_computer_use_capture_routing.py — 13 integration
tests that drive _capture_response end-to-end with deterministic stubs
for the routing helper, _run_async, vision_analyze_tool, and
get_hermes_dir, so the full code path is exercised without a live
cua-driver, real auxiliary client, or network access.
Coverage:
* TestCaptureResponseDefaultPath (3 cases)
- SOM PNG capture returns the legacy multimodal envelope when the
routing helper says 'native' (image/png MIME).
- Same path returns image/jpeg MIME for JPEG payloads (cua-driver
can return either).
- AX-only mode never even consults the routing helper because no
PNG is present.
* TestCaptureResponseRoutedToAuxVision (5 cases)
- SOM capture with routing on returns a JSON string with the
vision_analysis embedded, the AX/SOM index preserved, and NO
image_url parts. Verifies the aux call receives a path under
the configured cache and a prompt that grounds itself against
the AX summary.
- Temp screenshot file is unlinked after _capture_response returns,
including when the aux call raises (the finally block runs).
- Empty / malformed aux analysis falls back to the multimodal
envelope so the user always gets *something* useful.
* TestRoutingDecisionWiring (4 cases)
- Explicit auxiliary.vision in config flips routing on regardless of
main-model vision capability.
- Vision-capable main + native tool-result support keeps multimodal.
- Config load failure fails open (returns False, multimodal path
continues to work).
- Helper exception is swallowed and routes to legacy behaviour.
* TestBugReproductionAnchor (1 case) - directly pins the #24015
contract: when routing is on, the response must NEVER contain a
'data:image' or 'image_url' substring. That is exactly what tripped
the reporter's HTTP 404 ('No endpoints found that support image
input') on tencent/hy3-preview before the fix.
Bug-reproduction proof:
$ git checkout upstream/main -- tools/computer_use/tool.py
$ scripts/run_tests.sh tests/tools/test_computer_use_capture_routing.py
============================== 13 failed in 1.29s ==============================
$ # restore tool.py to this branch's HEAD
$ scripts/run_tests.sh tests/tools/test_computer_use_capture_routing.py
============================== 13 passed in 1.04s ==============================
Total branch coverage:
85 passed across test_computer_use.py, test_computer_use_vision_routing.py,
test_computer_use_capture_routing.py
