A procedure for investigating and fixing failing automated tests. Automated tests are checks that run code and compare its behavior with expected results; the guide covers test mistakes, code bugs, setup problems, race conditions, and flaky tests.

Use it to diagnose individual failures or test a whole suite, including checks for parallel execution and isolated temporary files. It also suggests documenting the cause and adding edge-case tests.

It helps distinguish whether the test, the implementation, or the environment is at fault. Running focused and full test suites then helps confirm the fix and prevent the problem from returning.

fix-test — Skill by TypedDevs

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods

npx agentmods add skills/typeddevs/bashunit/fix-test

Any agent

npx skills add TypedDevs/bashunit --skill fix-test

Clone the repo

git clone --depth 1 https://github.com/TypedDevs/bashunit

Made for: Claude Code, Codex.

Per session 9 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 354 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5	$0.00009	$0.00354
Opus 5	$0.00005	$0.00177
Sonnet 5	$0.00002	$0.00071
Haiku 4.5	$0.00001	$0.00035

Measured 2d ago against content hash ce854a77961d, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

fix-test scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.claude/skills/fix-test/SKILL.md · 55 lines

What it actually says

Fix Test

Systematically debug and fix failing test(s).

Workflow

1. Identify Failures

./bashunit tests/ 2>&1

Parse: which files, which functions, error messages.

2. Categorize Each Failure

Test bug — test itself is wrong (wrong expected value, bad setup)
Implementation bug — code doesn't match expected behavior
Environment issue — missing dependency, wrong fixture path
Race condition — passes sequential, fails parallel
Flaky test — network/time/random dependency

3. Fix

Test bug: correct assertion or setup
Implementation bug: minimal fix in src/, follow TDD
Environment: fix set_up / fixtures
Race condition: use $temp_dir for isolation, wait for async
Flaky: mock external dependencies

4. Verify

./bashunit path/to/fixed_test.sh        # Specific test
./bashunit tests/                        # Full suite
./bashunit --parallel tests/             # Isolation check

5. Prevent Regression

Document root cause. Consider adding edge case tests to prevent recurrence.

Debugging Tips

Use --filter "test_name" to run single test
Add echo "DEBUG: $var" >&2 temporarily
Check fixtures exist: ls tests/fixtures/
Verify mocks: assert_have_been_called mock_name

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2d ago First seen · 55 lines · 9 tokens per session scan A ce854a77961d

Subscribe to this mod's changes

fix-test is a skill published in the GitHub repository TypedDevs/bashunit (424 stars, last pushed 2d ago), licensed MIT. It adds 9 tokens to every session and 354 once invoked, about $0.0000 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Debugging Research Testing assertions bash bash-script testing-framework unittesting

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fix-test