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Test Coverage Strategy

Category: Engineering  ·  Sub-category: testing  ·  Last updated:
Use when reasoning about code coverage as a strategic measurement rather than a target: the coverage-criterion hierarchy (function, statement, line, branch, decision, condition, MC/DC, path), Marick's distinction between coverage as a floor signal and coverage as a ceiling target, Goodhart's Law applied to coverage metrics, why 100% line coverage may catch nothing important while 80% well-chosen coverage catches almost everything, the safety-critical industry's MC/DC requirement (DO-178C aviation, ISO 26262 automotive) as the empirical evidence that coverage at the right granularity matters, the difference between covered (lines exercised) and tested (behaviors verified), and how coverage gaps are diagnostic signals about the test suite. Do NOT use for choosing test levels (use testing-strategy), the technique of mutation testing as a stronger signal (use mutation-testing), the construction of test doubles (use test-doubles-design), or specific coverage-tooling configuration (tool docs).

What this skill does

Test Coverage Strategy is a community-contributed Claude Code skill in the testing sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/test-coverage-strategy/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when reasoning about code coverage as a strategic measurement rather than a target: the coverage-criterion hierarchy (function, statement, line, branch, decision, condition, MC/DC, path), Marick's distinction between coverage as a floor signal and coverage as a ceiling target, Goodhart's Law applied to coverage metrics, why 100% line coverage may catch nothing important while 80% well-chosen coverage catches almost everything, the safety-critical industry's MC/DC requirement (DO-178C aviation, ISO 26262 automotive) as the empirical evidence that coverage at the right granularity matters, the difference between covered (lines exercised) and tested (behaviors verified), and how coverage gaps are diagnostic signals about the test suite. Do NOT use for choosing test levels (use testing-strategy), the technique of mutation testing as a stronger signal (use mutation-testing), the construction of test doubles (use test-doubles-design), or specific coverage-tooling configuration (tool docs).

Who uses this skill

The Test Coverage Strategy Claude Code skill is built for software engineers, backend developers, full-stack teams, and technical leads building and maintaining production systems. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 69,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/test-coverage-strategy
curl -L https://claudskills.com/skills/test-coverage-strategy/SKILL.md \
  -o ~/.claude/skills/test-coverage-strategy/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/test-coverage-strategy/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/test-coverage-strategy/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\test-coverage-strategy\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

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See pricing → Download desktop app

Attribution & license

More Engineering skills

Browse all Engineering skills in the ClaudSkills registry, or explore these other picks from the same category:

Browse all Engineering skills → Top 100 skills
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