[yunyv]

Reference issue

No matching issue or competing fix found for Inverter's handling of a running child.

What does this implement/fix?

InverterNode documents that it passes through RUNNING, but currently converts it to FAILURE. For example, a tree built from <Inverter><Sleep sec="1.5" /></Inverter> immediately reports failure while its child is still running.

Preserve RUNNING without changing the existing success/failure inversion. Add a three-state regression and an XML-factory test that advances a controlled clock through the child's completion. No actual sleeps, API, parameter, dependency, or CI changes.

Additional information

Prepared and tested with AI assistance; no human review or hardware verification is claimed.

Linux / Python 3.13.5 and 3.14.8, pytest 9.1.0, Ruff 0.17.1:

• Baseline with new tests: 2 failed, 8 passed.
• Fixed complete behavior-tree tests: 10 passed with warnings as errors.
• Behavior-tree tests plus native code-style check: 11 passed on each Python version.
• Ruff on both changed files, compileall and git diff --check: passed. Ruff reports an existing configuration deprecation warning.

The configured mypy package list does not include MissionPlanning. Full bash runtests.sh, documentation build, animations and other platforms were not run; the full suite includes an unrelated PlantUML network/plotting test. The existing Inverter docstring and official RST autodoc already describe the correct behavior.

CheckList

• Did you add an unittest for your new example or defect fix?
• Did you add documents for your new example? No new example; existing contract unchanged.
• All CIs are green? The three external statuses have succeeded: CircleCI documentation build and artifact, and AppVeyor. AppVeyor build 55007246 tested the PR merge for head 9e73a85ce28c698c470d75551922d41e501a1740 on Windows/Python 3.13 and reports 160 passed in 366.91s (https://ci.appveyor.com/project/AtsushiSakai/pythonrobotics/builds/55007246). GitHub Actions Linux_CI, Windows_CI, MacOS_CI and CodeQL have not run: all four await maintainer approval. This checklist remains unchecked until those workflows complete. The local-test limitations above still apply.