Supercov

Coverage for coding agents and software factories

Measure code coverage with npx supercov and write one test.

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How Supercov works

Supercov gives coding agents the deepest JavaScript coverage for code verification, including MC/DC and assertion coverage.

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CodexClaude CodeCursorGemini CLIGitHub Copilot
CodexClaude CodeCursorGemini CLIGitHub Copilot
Improve test coverage•••

Working

Supercov gives the agent the next test to write.

Each run returns the uncovered paths. The agent adds focused tests, reruns the suite, and continues while useful gaps remain.

Coverage agents can act on.

File-by-file coverage, uncovered paths, and assertion gaps—so your agent knows what to test next.

Supported bySupercorp

3.4kGitHub stars↗

npm downloads

200k+weekly downloads

Supported by Supercorp.

Backed by Supercorp’s open-source track record.

  • RSpec
  • Minitest
  • Jest
  • Mocha
  • Vitest
  • pytest
  • Playwright
  • node:test
  • AVA
  • cargo test
  • cargo-nextest
  • unittest
  • Cucumber
  • test-unit
  • rustdoc

Supported test suites.

Playwright, Vitest, Jest, Cargo, pytest, RSpec, and more.

Use leftover tokens on coverage.

Before a reset—or overnight—turn idle agent time into coverage that stays with the repository.

For software factories.

Every pass returns fresh, executable evidence, so agents can keep iterating around the clock while regressions are caught before they ship.

Low overhead.

Fast instrumentation keeps the test loop moving.

Any language.

JavaScript, TypeScript, Rust, Python, and Ruby—with more to come.

Any agent.

Claude Code, Codex, Cursor, Gemini CLI, GitHub Copilot—and more.