nowsprinting/run-tests
skills/run-tests/SKILL.md
Provides guidelines for running Unity tests using the run_unity_tests tool. Make sure to use this skill whenever running, executing, or re-running tests on the Unity editor. This includes verifying implementations, debugging test failures, running specific test assemblies, or any task that involves the run_unity_tests tool. Even if the user just says "run the tests" or "check if it passes", use this skill.
$ install --global
skillsauthnpx skillsauth add nowsprinting/claude-code-settings-for-unity run-testsInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
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SKILL.md
- name:
- run-tests
- description:
- >-
- license:
- Unlicense
- author:
- Koji Hasegawa
Gotchas
- Never call two Unity Editor tools in parallel.
unity_play_control,get_unity_compilation_result,run_unity_tests, andrun_method_in_unitymust be called strictly one at a time — always wait for each call to return before making the next one. Calling them concurrently causes domain-reload conflicts that result in "canceled" or "did not connect within 30 seconds" errors. - When a Unity Editor tool returns
errororcanceled, wait 10 seconds before retrying. Domain reload typically takes several seconds; immediate retry hits the same in-flight reload and fails again. Do not switch tools in the meantime (e.g., callingunity_play_controlto verify state) — that just compounds the multiplexed calls. If the same tool returnserrororcanceledon two consecutive attempts (with the 10-second wait between them), stop and consult the user instead of retrying further.
Run Tests
Before running tests, complete the following steps in order:
- If any code was modified, confirm compilation success using the
get_unity_compilation_resulttool before proceeding. - To determine
assemblyNamesandtestModefor a specific test class, run${CLAUDE_SKILL_DIR}/scripts/resolve-test-target.sh <test-class-cs-path>. The script prints<assemblyName>\t<testMode>(e.g.MyGame.Tests\tPlayMode). Skip this step when running an already-known assembly.
Then use the run_unity_tests tool to run the tests on the Unity editor.
Test execution can take several minutes. Do not re-run while a test is in progress — always wait for it to complete or time out. If a timeout occurs, narrow down the tests using filter settings and re-run.
Rules for Test Failures
If the same test(s) fail on two or more consecutive runs, stop and consult the user rather than continuing to fix.
When consulting, clarify:
- Current failure status: what is failing and the likely cause
- Fix history: what was changed, how many times, and the scope of impact
- Planned approach: what options are being considered next
Troubleshooting
Read the appropriate resource file based on the situation:
- Any Unity MCP tool (
run_unity_tests,unity_play_control,get_unity_compilation_result) is not available or fails with a connection error: Read${CLAUDE_SKILL_DIR}/resources/troubleshooting-run-unity-tests.md - A test fails due to an assertion, constraint, or comparer in the
TestHelpernamespace (excludingTestHelper.UI): Read${CLAUDE_SKILL_DIR}/resources/troubleshooting-test-helper.md - A test fails due to an exception thrown from the
TestHelper.UInamespace: Read${CLAUDE_SKILL_DIR}/resources/troubleshooting-test-helper-ui.md
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