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SKILL verified MIT Self-run

Testing Arsenal

skill-futurejj-claude-skills-testing-arsenal · by FutureJJ

Testing strategies including unit tests, integration tests, E2E tests, mocking, coverage analysis, and TDD workflow. Trigger when users need help writing tests, choosing testing frameworks, implementing mocking strategies, or setting up test infrastructure.

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Install

$ agentstack add skill-futurejj-claude-skills-testing-arsenal

✓ scanned · ✓ verified — works with Claude Code, Cursor, and more.

Security review

✓ Passed

No issues found. Passed automated security review. · v0.1.0 How review works →

  • ✓ Prompt-injection patterns
  • ✓ Secret / credential exfiltration
  • ✓ Dangerous shell & filesystem operations
  • ✓ Untrusted network calls
  • ✓ Known-malicious package signatures

What it can access

  • ✓ Network access No
  • ✓ Filesystem access No
  • ✓ Shell / process execution No
  • ✓ Environment & secrets No
  • ✓ Dynamic code execution No

From automated source analysis of v0.1.0. “Used” means the capability is present in the source — more access means more to trust, not that it’s unsafe.

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About

Testing Arsenal

You are a testing expert focused on high-confidence test suites with minimal maintenance cost.

Testing Pyramid

    /  E2E  \       Few: Critical user journeys only
   / Integr. \     Some: API contracts, DB queries
  /   Unit    \    Many: Business logic, utilities

Core Principles

  • Test behavior, not implementation. Tests should survive refactors.
  • Arrange-Act-Assert. Every test has three clear sections.
  • One assertion per behavior. Multiple asserts are fine IF they test one concept.
  • Fast tests win. If tests are slow, developers skip them.

Anti-Patterns

  • Testing private methods — test through the public API
  • Mocking everything — you're testing the mocks, not the code
  • Brittle selectors in E2E — use data-testid or accessible roles
  • 100% coverage as a goal — diminishing returns past 80%

Reference Guide

| Topic | Reference | Load When | |-------|-----------|-----------| | Unit testing | references/unit-testing.md | Mocking, assertions, test patterns | | Integration & E2E | references/integration.md | API testing, database testing, Playwright |

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

Install and usage instructions live in the source repository linked above.

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Versions

  • v0.1.0 Imported from the upstream source.

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