Agent skill

test-detect

Auto-detect testing framework and run relevant tests. Identifies Jest, Vitest, Playwright, Cypress, pytest, Go test, and others. Can run all tests, specific file tests, or generate basic tests for new code. Usage - /test-detect, /test-detect src/auth/login.ts, /test-detect generate src/utils.ts

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Install this agent skill to your Project

npx add-skill https://github.com/davila7/claude-code-templates/tree/main/cli-tool/components/skills/development/test-detect

SKILL.md

Test Detect

Automatically detect the testing framework in the current project and run the right tests.

Workflow

Step 1: Detect the testing framework

Check for these files in order (first match wins):

Check Framework Run Command
vitest.config.* exists OR vitest in devDeps Vitest npx vitest run
jest.config.* exists OR jest in devDeps Jest npx jest
playwright.config.* exists Playwright npx playwright test
cypress.config.* exists Cypress npx cypress run
pytest.ini or conftest.py or pyproject.toml with [tool.pytest] pytest python -m pytest
go.mod exists Go test go test ./...
Cargo.toml exists Rust/cargo cargo test
mix.exs exists ExUnit mix test
Gemfile with rspec RSpec bundle exec rspec
package.json has scripts.test npm test npm test

Report the detected framework before proceeding.

Step 2: Parse arguments

Check $ARGUMENTS for the mode:

  • No arguments or "all": Run the full test suite (Step 3)
  • File path (e.g., src/auth/login.ts): Run tests for that file (Step 4)
  • "generate" + file path (e.g., generate src/utils.ts): Generate tests (Step 5)

Step 3: Run full test suite

Run the detected test command. After completion:

  • Report total tests, passed, failed, skipped
  • If tests fail, show the first 3 failure messages with file:line references
  • Suggest: "Run /test-detect <failing-file> to investigate a specific failure"

Step 4: Run tests for a specific file

Given a source file path, find its test file:

Search strategy (try in order):

  1. __tests__/<filename>.test.<ext> (Jest convention)
  2. <filename>.test.<ext> (co-located)
  3. <filename>.spec.<ext> (alternative convention)
  4. test/<filename>_test.<ext> (Go/Python convention)
  5. tests/test_<filename>.<ext> (pytest convention)
  6. <filename>_test.go (Go convention)

Use Glob to find matches. If found, run only that test file:

Framework Command
Vitest npx vitest run <test-file>
Jest npx jest <test-file>
Playwright npx playwright test <test-file>
pytest python -m pytest <test-file>
Go go test -run <TestName> ./<package>/
Cargo cargo test <test_name>

If no test file found, ask: "No tests found for this file. Want me to generate them? Run /test-detect generate <file>"

Step 5: Generate tests

Read the source file and analyze:

  1. Identify all exported functions/classes/components
  2. Determine the appropriate test patterns for the framework
  3. Generate a test file with:
    • Import statements
    • describe block per function/class
    • it/test blocks covering: happy path, edge cases, error cases
    • Framework-appropriate assertions and mocking

Save to the conventional location for the detected framework:

  • Jest/Vitest: __tests__/<filename>.test.<ext> or <filename>.test.<ext> (match existing convention)
  • pytest: tests/test_<filename>.py
  • Go: <filename>_test.go (same directory)
  • RSpec: spec/<filename>_spec.rb

Show the generated file path and ask if the user wants to run the new tests.

Tips

  • If multiple frameworks are detected (e.g., Vitest for unit tests + Playwright for e2e), mention both and default to the unit test framework
  • For monorepos, detect from the closest config file to the current directory
  • If package.json has both test and test:unit/test:e2e scripts, prefer the specific one when context is clear

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