What is testing-strategy?

A guide to planning how a software project should be tested, from small isolated checks to full application tests. It explains TDD, or writing a failing test before the code, along with test choices, test data, coverage, and CI checks.

Use it to design a testing approach, select frameworks, set coverage or CI gates, manage fixtures and mocks, investigate flaky tests, and add API, contract, visual, performance, or mutation tests.

It helps teams choose suitable tests and deal with unreliable tests, slow test runs, database isolation, and misleading coverage targets instead of adding tests without a plan.

testing-strategy — Skill for Codex by san-npm/skills-ws

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.

Any agent

npx skills add san-npm/skills-ws --skill testing-strategy

Clone the repo

git clone --depth 1 https://github.com/san-npm/skills-ws

Made for: Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/san-npm/skills-ws/testing-strategy/github.svg)](https://agentmods.dev/skills/san-npm/skills-ws/testing-strategy)

Your own site

<a href="https://agentmods.dev/skills/san-npm/skills-ws/testing-strategy"><img src="https://agentmods.dev/badge/skills/san-npm/skills-ws/testing-strategy/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/san-npm/skills-ws/testing-strategy"><img src="https://agentmods.dev/badge/skills/san-npm/skills-ws/testing-strategy.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 78 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 535 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

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 5.1	$0.00078	$0.00535
Opus 5.5	$0.00031	$0.00214
Sonnet 5.5	$0.00016	$0.00107
Haiku 4.5	$0.00008	$0.00053

Measured 2mo ago against content hash 5b70edeb3c33, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

testing-strategy 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 2mo 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.

skills/testing-strategy/SKILL.md · 31 lines

How it starts

The opening of the file, as written. The whole thing — 31 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Testing Strategy

Reference guide

Read only the references needed for the current request:

Testing Pyramid: references/testing-pyramid.md
Framework Selection: references/framework-selection.md
TDD Workflow: references/tdd-workflow.md
Mocking Patterns: references/mocking-patterns.md
Test Fixtures & Factories: references/test-fixtures-factories.md
Coverage Targets: references/coverage-targets.md
CI Integration: references/ci-integration.md
Flaky Test Management: references/flaky-test-management.md
Visual Regression Testing: references/visual-regression-testing.md
Contract Testing: references/contract-testing.md
Test Data Management: references/test-data-management.md
Snapshot Testing: references/snapshot-testing.md
CI Test Parallelization: references/ci-test-parallelization.md
Mutation Testing: references/mutation-testing.md
Test Strategy & Governance: references/test-strategy-governance.md
API Testing Patterns: references/api-testing-patterns.md
Performance Testing: references/performance-testing.md
Error Monitoring (Production): references/error-monitoring-production.md
Logging: references/logging.md
Observability Checklist: references/observability-checklist.md

Read the full file on GitHub · 31 lines

Files

What ships with it

21 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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.

2mo ago First seen · 31 lines · 78 tokens per session scan A 5b70edeb3c33

Subscribe to this mod's changes

testing-strategy is a skill published in the GitHub repository san-npm/skills-ws (4 stars, last pushed 1mo ago), licensed MIT. It adds 78 tokens to every session and 535 once invoked, about $0.0003 per session on Opus 5.5. 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 2026-09-07.

TDD Testing

testing-strategy next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
testing-strategysan-npm/skills-ws	Skill	4	1mo ago	MIT	A	78	Codex
engram-testing-coverageGentleman-Programming/engram	Skill	7.8k	yesterday	MIT	A	25	Claude Code, Codex
principle-test-behavior-not-implementationmichael-denyer/pstack-claude	Skill	4.1k	yesterday	MIT	A	50	Claude Code
tddcodewithmukesh/dotnet-claude-kit	Skill	805	2d ago	MIT	A	81	Claude Code
nw-ddd-eventsourcingnWave-ai/nWave	Skill	631	yesterday	MIT	A	38	Claude Code
nw-fp-clojurenWave-ai/nWave	Skill	631	yesterday	MIT	A	25	Claude Code
nw-leanux-methodologynWave-ai/nWave	Skill	631	yesterday	MIT	A	37	Claude Code