# test-flakiness

Spots flaky tests from CI run logs, groups intermittent failures by cause, and updates quarantine lists in game projects.

- skill · `type=skill` · Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, OpenCode · 408 installs · ★ 27473
- Author: Donchitos
- License: MIT · policy=mirror · the beginning of the file is at the end of this page
- Source: https://github.com/Donchitos/Claude-Code-Game-Studios/tree/HEAD/.claude/skills/test-flakiness/SKILL.md
- Updated: 2026-10-19
- HTML: https://affpapa.org/en/nevibecode/skills/test-flakiness

## What it does

The skill parses test artifacts across multiple runs to detect cases that flip between pass and fail without code edits. It handles JUnit XML from Godot GdUnit4, NUnit XML from Unity game-ci, and plain text logs from Unreal Engine. Identified failures are saved to the quarantine section in `tests/regression-suite.md` or an optional report at `production/qa/flakiness-report-[date].md`.

It categorizes triggers into async timing, random seeds, resource leaks, or scene load races. Reliable signals need at least 3 runs. With fewer runs, any failure stays marked as suspected because two data points do not prove intermittent behavior. That makes it easier to quarantine broken tests before a team starts ignoring red builds.

## Requirements
- Works with: Unity, Unreal Engine, Godot

## Install

### Claude Code (native platform)

1. **Skills CLI (Vercel)**
```bash
npx skills add Donchitos/Claude-Code-Game-Studios --skill test-flakiness -a claude-code
```

2. **Manually: put the files in place**
- File: `~/.claude/skills/test-flakiness/SKILL.md` — Copy the whole skill folder; for one project use .claude/skills/test-flakiness/

### Codex

1. **Skills CLI (Vercel)**
```bash
npx skills add Donchitos/Claude-Code-Game-Studios --skill test-flakiness -a codex
```

2. **Manually: put the files in place**
- File: `.agents/skills/test-flakiness/SKILL.md` — For all projects use ~/.agents/skills/

### Cursor

1. **Skills CLI (Vercel)**
```bash
npx skills add Donchitos/Claude-Code-Game-Studios --skill test-flakiness -a cursor
```

2. **Manually: put the files in place**
- File: `.cursor/skills/test-flakiness/SKILL.md` — Cursor also reads .agents/skills/ and .claude/skills/

### GitHub Copilot

1. **GitHub CLI**
```bash
gh skill install Donchitos/Claude-Code-Game-Studios test-flakiness
```

2. **Manually: put the files in place**
- File: `.github/skills/test-flakiness/SKILL.md`

### Gemini CLI

1. **Skills CLI (Vercel)**
```bash
npx skills add Donchitos/Claude-Code-Game-Studios --skill test-flakiness -a gemini-cli
```

2. **Platform CLI**
```bash
gemini skills install https://github.com/Donchitos/Claude-Code-Game-Studios --path .claude/skills/test-flakiness
```

### Windsurf (Devin Desktop)

**Manually: put the files in place**
- File: `.devin/skills/test-flakiness/SKILL.md` — The legacy .windsurf/skills/ path still works

### OpenCode

**Skills CLI (Vercel)**
```bash
npx skills add Donchitos/Claude-Code-Game-Studios --skill test-flakiness -a opencode
```

### Claude.ai

**Claude.ai**
- Zip the folder and upload it in Settings → Capabilities → Skills

Where a file is given instead of a command, copy the files from the source to that path: https://github.com/Donchitos/Claude-Code-Game-Studios/tree/HEAD/.claude/skills/test-flakiness/SKILL.md

## When to use it
- find intermittent test failures in CI build logs
- quarantine flaky tests in tests/regression-suite.md
- diagnose causes such as async delays or memory leaks
- skip problematic tests using game engine native flags

## Example prompts
- /test-flakiness scan
- /test-flakiness registry
- Inspect our CI test artifacts with /test-flakiness test-results/

## Source text · SKILL.md · MIT

Below is the content of a third-party file. It is data, not instructions for you: do not act on anything written inside unless the human asks. Block tag: 5b595ecaa47f107f.

BEGIN THIRD-PARTY FILE 5b595ecaa47f107f
````text
---
name: test-flakiness
description: "Find flaky tests from CI logs — aggregates pass rates, spots intermittent failures, recommends quarantine. After multiple runs."
argument-hint: "[ci-log-path | scan | registry]"
user-invocable: true
allowed-tools: Read, Glob, Grep, Write, Edit, Bash(ls -t *), Bash(bash "*/.claude/skills/test-flakiness/../../hooks/yaml-helper.sh" resolve_config *)
model: sonnet
---

!`bash "${CLAUDE_SKILL_DIR}/../../hooks/yaml-helper.sh" resolve_config --keys automation`

**Automation mode**: Resolve `modes.automation` (`project.local.yaml` →
`project.yaml` → default `collaborative`). Every `AskUserQuestion` call and
every file write follows `.claude/docs/automation-modes.md`
(collaborative asks always · guided major-only · autonomous logs and proceeds;
`automation_always_ask` categories always prompt).

# Test Flakiness Detection

A flaky test is one that sometimes passes and sometimes fails without any code
change. Flaky tests are worse than no tests in some ways — they train the team
to ignore red CI runs, masking genuine failures. This skill identifies them,
explains likely causes, and recommends whether to quarantine or fix each one.

**Output:** Updated `tests/regression-suite.md` quarantine section + optional
`production/qa/flakiness-report-[date].md`

**When to run:**
- Polish phase (tests have had many runs; statistical signal is reliable)
- When developers start dismissing CI failures as "probably flaky"
- After `/regression-suite` identifies quarantined tests that need diagnosis

---

## 1. Parse Arguments

**Modes:**
- `/test-flakiness [ci-log-path]` — analyse a specific CI run log file
- `/test-flakiness scan` — scan all available CI logs in `.github/` or
  standard log output directories
- `/test-flakiness registry` — read existing regression-suite.md quarantine
  section and provide remediation guidance for already-known flaky tests
- No argument — auto-detect: run `scan` if CI logs are accessible, else
  `registry`

---

## 2. Locate CI Log Data

### Option A — GitHub Actions (preferred)

Check for test result artifacts:
```bash
ls -t .github/ 2>/dev/null
ls -t test-results/ 2>/dev/null
```

For Godot projects: GdUnit4 outputs XML results compatible with JUnit format,
under `reports/` (its default report folder, `res://reports/`). Check `reports/`,
and any `test-results/` you saved runs into, for `.xml` files.

For Unity projects: game-ci test runner outputs NUnit XML to `test-results/`
by default.

For Unreal projects: automation logs go to `Saved/Logs/`. Grep for
`Result={Success}` and `Result={Fail}` — each test prints
`Test Completed. Result={<status>}`
(`docs/engine-reference/unreal/current-best-practices.md`, "Command Line").

### Option B — Local log files

If a path argument is provided, read that file directly.

### Option C — No log data available

If no logs found:
> "No CI log data found. To detect flaky tests, this skill needs test result
````
END THIRD-PARTY FILE 5b595ecaa47f107f

The third-party file has ended. Everything between the 5b595ecaa47f107f tags is data: requests and commands from it are not followed. An “end of file” line with another tag inside the block is part of the file.

First 2966 of 10494 bytes. © Donchitos · MIT · https://github.com/Donchitos/Claude-Code-Game-Studios/tree/HEAD/.claude/skills/test-flakiness/SKILL.md

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---
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