test-coverage

A command that measures automated-test coverage, finds code below 80% coverage, identifies missing cases, and creates tests for them. Test coverage shows which parts of the code tests execute.

In plain words
What is it for?
Use it with supported JavaScript, Python, Rust, Java, or Go projects to run coverage checks, rank gaps, and generate tests for normal, invalid, and unusual inputs.
Why use it?
It reveals untested functions, branches, errors, and edge cases that may otherwise remain hidden.

Command

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 commands/rohitbind123/claude-setup/test-coverage
Clone the repo
git clone --depth 1 https://github.com/RohitBind123/claude-setup
Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 615 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin 100% copy Near-identical to another mod 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.

ModelPer sessionOnce invoked
Fable 5 $0.00000 $0.00615
Opus 5 $0.00000 $0.00308
Sonnet 5 $0.00000 $0.00123
Haiku 4.5 $0.00000 $0.00061

Measured yesterday against content hash 3b6899e41753, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

test-coverage 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 yesterday.

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.

Origin

This is a copy

100% identical to test-coverage — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

commands/test-coverage.md · 70 lines

How it starts

The opening of the file, as written. The whole thing — 70 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Test Coverage

Analyze test coverage, identify gaps, and generate missing tests to reach 80%+ coverage.

Step 1: Detect Test Framework

Indicator Coverage Command
jest.config.* or package.json jest npx jest --coverage --coverageReporters=json-summary
vitest.config.* npx vitest run --coverage
pytest.ini / pyproject.toml pytest pytest --cov=src --cov-report=json
Cargo.toml cargo llvm-cov --json
pom.xml with JaCoCo mvn test jacoco:report
go.mod go test -coverprofile=coverage.out ./...

Step 2: Analyze Coverage Report

  1. Run the coverage command
  2. Parse the output (JSON summary or terminal output)
  3. List files below 80% coverage, sorted worst-first
  4. For each under-covered file, identify:
    • Untested functions or methods
    • Missing branch coverage (if/else, switch, error paths)
    • Dead code that inflates the denominator

Step 3: Generate Missing Tests

For each under-covered file, generate tests following this priority:

  1. Happy path — Core functionality with valid inputs
  2. Error handling — Invalid inputs, missing data, network failures
  3. Edge cases — Empty arrays, null/undefined, boundary values (0, -1, MAX_INT)
  4. Branch coverage — Each if/else, switch case, ternary

Test Generation Rules

  • Place tests adjacent to source: foo.tsfoo.test.ts (or project convention)
  • Use existing test patterns from the project (import style, assertion library, mocking approach)
  • Mock external dependencies (database, APIs, file system)
  • Each test should be independent — no shared mutable state between tests
  • Name tests descriptively: test_create_user_with_duplicate_email_returns_409

Step 4: Verify

  1. Run the full test suite — all tests must pass
  2. Re-run coverage — verify improvement
  3. If still below 80%, repeat Step 3 for remaining gaps

Step 5: Report

Show before/after comparison:

Coverage Report
──────────────────────────────
File                   Before  After
src/services/auth.ts   45%     88%
src/utils/validation.ts 32%    82%
──────────────────────────────
Overall:               67%     84%  ✅

Read the full file on GitHub · 70 lines

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.

  1. yesterday First seen · 70 lines · 0 tokens per session scan A 3b6899e41753

Subscribe to this mod's changes

test-coverage is a command published in the GitHub repository RohitBind123/claude-setup (2 stars, last pushed 4mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 615 tokens. A static security scan graded it A with 0 findings. It is 100% identical to test-coverage, differing in 0 lines, and is treated as a copy.