/configure:tests

Check and configure testing frameworks against best practices (Vitest, Jest, pytest, cargo-nextest).

Context

This command validates testing infrastructure and optionally configures or upgrades to modern frameworks.

Modern testing stack preferences:

• JavaScript/TypeScript: Vitest (preferred) or Jest
• Python: pytest with pytest-cov
• Rust: cargo-nextest for improved performance

Version Checking

CRITICAL: Before flagging outdated versions, verify latest releases:

1. Vitest: Check vitest.dev or GitHub releases
2. Jest: Check jestjs.io or npm
3. pytest: Check pytest.org or PyPI
4. cargo-nextest: Check nexte.st or GitHub releases

Use WebSearch or WebFetch to verify current versions before reporting outdated frameworks.

Workflow

Phase 1: Framework Detection

Detect project language and existing test framework:

Phase 2: Current State Analysis

For each detected framework, check configuration:

Vitest:

• vitest.config.ts or vitest.config.js exists
• globals: true configured for compatibility
• environment set appropriately (jsdom, happy-dom, node)
• Coverage configured with @vitest/coverage-v8 or @vitest/coverage-istanbul
• Watch mode exclusions configured

Jest:

• jest.config.js or jest.config.ts exists
• testEnvironment configured
• Coverage configuration present
• Transform configured for TypeScript/JSX
• Module path aliases configured

pytest:

• pyproject.toml has [tool.pytest.ini_options] section
• testpaths configured
• addopts includes useful flags (-v, --strict-markers)
• markers defined for test categorization
• pytest-cov installed

cargo-nextest:

• .nextest.toml exists
• Profile configurations (default, ci)
• Retry policy configured
• Test groups defined if needed

Phase 3: Compliance Report

Generate formatted compliance report:

Testing Framework Compliance Report
====================================
Project: [name]
Language: [TypeScript | Python | Rust]
Framework: [Vitest 2.x | pytest 8.x | cargo-nextest 0.9.x]

Configuration:
  Config file             vitest.config.ts           [✅ EXISTS | ❌ MISSING]
  Test directory          tests/ or __tests__/       [✅ EXISTS | ⚠️ NON-STANDARD]
  Coverage provider       @vitest/coverage-v8        [✅ CONFIGURED | ❌ MISSING]
  Environment             jsdom                      [✅ CONFIGURED | ⚠️ NOT SET]
  Watch exclusions        node_modules, dist         [✅ CONFIGURED | ⚠️ INCOMPLETE]

Test Organization:
  Unit tests              src/**/*.test.ts           [✅ FOUND | ❌ NONE]
  Integration tests       tests/integration/         [✅ FOUND | ⏭️ N/A]
  E2E tests               tests/e2e/                 [✅ FOUND | ⏭️ N/A]

Scripts:
  test command            package.json scripts       [✅ CONFIGURED | ❌ MISSING]
  test:watch              package.json scripts       [✅ CONFIGURED | ⚠️ MISSING]
  test:coverage           package.json scripts       [✅ CONFIGURED | ❌ MISSING]

Overall: [X issues found]

Recommendations:
  - Add coverage configuration with 80% threshold
  - Configure watch mode exclusions
  - Add test:ui script for Vitest UI

Phase 4: Configuration (if –fix or user confirms)

Vitest Configuration (Recommended for JS/TS)

Install dependencies:

npm install --save-dev vitest @vitest/ui @vitest/coverage-v8
# or
bun add --dev vitest @vitest/ui @vitest/coverage-v8

Create vitest.config.ts:

import { defineConfig } from 'vitest/config';
import { resolve } from 'path';

export default defineConfig({
  test: {
    // Enable globals for compatibility with Jest-style tests
    globals: true,

    // Test environment (jsdom for DOM testing, node for backend)
    environment: 'jsdom', // or 'node', 'happy-dom'

    // Setup files to run before tests
    setupFiles: ['./tests/setup.ts'],

    // Coverage configuration
    coverage: {
      provider: 'v8', // or 'istanbul'
      reporter: ['text', 'json', 'html', 'lcov'],
      exclude: [
        'node_modules/',
        'dist/',
        'tests/',
        '**/*.config.*',
        '**/*.d.ts',
      ],
      thresholds: {
        lines: 80,
        functions: 80,
        branches: 80,
        statements: 80,
      },
    },

    // Watch mode exclusions
    watchExclude: ['**/node_modules/**', '**/dist/**', '**/.next/**'],

    // Test timeout
    testTimeout: 10000,

    // Include/exclude patterns
    include: ['**/*.{test,spec}.{js,mjs,cjs,ts,mts,cts,jsx,tsx}'],
    exclude: ['node_modules', 'dist', '.next', 'out'],
  },

  // Resolve aliases (if using path aliases)
  resolve: {
    alias: {
      '@': resolve(__dirname, './src'),
    },
  },
});

Add npm scripts to package.json:

{
  "scripts": {
    "test": "vitest run",
    "test:watch": "vitest",
    "test:ui": "vitest --ui",
    "test:coverage": "vitest run --coverage",
    "test:ci": "vitest run --coverage --reporter=junit --reporter=default"
  }
}

Jest Configuration (Alternative)

Create jest.config.ts:

import type { Config } from 'jest';

const config: Config = {
  preset: 'ts-jest',
  testEnvironment: 'jsdom',
  roots: ['<rootDir>/src', '<rootDir>/tests'],
  testMatch: ['**/__tests__/**/*.ts', '**/?(*.)+(spec|test).ts'],

  transform: {
    '^.+\\.tsx?$': ['ts-jest', {
      tsconfig: 'tsconfig.json',
    }],
  },

  collectCoverageFrom: [
    'src/**/*.{js,jsx,ts,tsx}',
    '!src/**/*.d.ts',
    '!src/**/*.stories.tsx',
  ],

  coverageThresholds: {
    global: {
      lines: 80,
      functions: 80,
      branches: 80,
      statements: 80,
    },
  },

  moduleNameMapper: {
    '^@/(.*)$': '<rootDir>/src/$1',
  },

  setupFilesAfterEnv: ['<rootDir>/tests/setup.ts'],
};

export default config;

Python pytest Configuration

Update pyproject.toml:

[tool.pytest.ini_options]
testpaths = ["tests"]
python_files = ["test_*.py", "*_test.py"]
python_classes = ["Test*"]
python_functions = ["test_*"]

addopts = [
    "-v",
    "--strict-markers",
    "--strict-config",
    "--cov=src",
    "--cov-report=term-missing",
    "--cov-report=html",
    "--cov-report=xml",
    "--cov-fail-under=80",
]

markers = [
    "unit: Unit tests",
    "integration: Integration tests",
    "e2e: End-to-end tests",
    "slow: Slow running tests",
]

[tool.coverage.run]
source = ["src"]
omit = [
    "*/tests/*",
    "*/migrations/*",
    "*/__init__.py",
]

[tool.coverage.report]
exclude_lines = [
    "pragma: no cover",
    "def __repr__",
    "if __name__ == .__main__.:",
    "raise AssertionError",
    "raise NotImplementedError",
    "if 0:",
    "if False:",
    "if TYPE_CHECKING:",
]

Install dependencies:

uv add --group dev pytest pytest-cov pytest-asyncio pytest-mock

Rust cargo-nextest Configuration

Install cargo-nextest:

cargo install cargo-nextest --locked

Create .nextest.toml:

[profile.default]
retries = 0
fail-fast = false

# Run tests with all features enabled
test-threads = "num-cpus"

[profile.ci]
retries = 2
fail-fast = true
test-threads = 2

# JUnit output for CI
[profile.ci.junit]
path = "target/nextest/ci/junit.xml"

[profile.default.junit]
path = "target/nextest/default/junit.xml"

Add to .cargo/config.toml (optional):

[alias]
test = "nextest run"

Phase 5: Test Organization

Create standard test directory structure:

JavaScript/TypeScript:

tests/
├── setup.ts              # Test setup and global mocks
├── unit/                 # Unit tests
│   └── utils.test.ts
├── integration/          # Integration tests
│   └── api.test.ts
└── e2e/                  # E2E tests
    └── user-flow.test.ts

Python:

tests/
├── conftest.py           # pytest fixtures and configuration
├── unit/                 # Unit tests
│   └── test_utils.py
├── integration/          # Integration tests
│   └── test_api.py
└── e2e/                  # E2E tests
    └── test_user_flow.py

Rust:

tests/
├── integration_test.rs   # Integration tests
└── common/               # Shared test utilities
    └── mod.rs

Phase 6: CI/CD Integration

Add test commands to GitHub Actions workflow:

JavaScript/TypeScript (Vitest):

- name: Run tests
  run: npm test -- --reporter=junit --reporter=default --coverage

- name: Upload coverage
  uses: codecov/codecov-action@v4
  with:
    files: ./coverage/lcov.info

Python (pytest):

- name: Run tests
  run: |
    uv run pytest --junitxml=junit.xml --cov-report=xml

- name: Upload coverage
  uses: codecov/codecov-action@v4
  with:
    files: ./coverage.xml

Rust (cargo-nextest):

- name: Install nextest
  uses: taiki-e/install-action@nextest

- name: Run tests
  run: cargo nextest run --profile ci --no-fail-fast

- name: Upload test results
  uses: actions/upload-artifact@v4
  with:
    name: test-results
    path: target/nextest/ci/junit.xml

Phase 7: Standards Tracking

Update .project-standards.yaml:

standards_version: "2025.1"
last_configured: "[timestamp]"
components:
  tests: "2025.1"
  tests_framework: "[vitest|jest|pytest|nextest]"
  tests_coverage_threshold: 80
  tests_ci_integrated: true

Phase 8: Migration Guide (if upgrading)

Jest → Vitest Migration:

1. Update dependencies:

   npm uninstall jest @types/jest
   npm install --save-dev vitest @vitest/ui @vitest/coverage-v8
   

2. Rename config file:

   mv jest.config.ts vitest.config.ts
   

3. Update test imports:

   // Before (Jest)
   import { describe, it, expect } from '@jest/globals';
   
   // After (Vitest with globals)
   // No import needed if globals: true in config
   

4. Update package.json scripts:

   {
     "scripts": {
       "test": "vitest run",
       "test:watch": "vitest"
     }
   }
   

unittest → pytest Migration (Python):

1. Install pytest:

   uv add --group dev pytest pytest-cov
   

2. Convert test files:

   # Before (unittest)
   import unittest
   class TestExample(unittest.TestCase):
       def test_something(self):
           self.assertEqual(1, 1)
   
   # After (pytest)
   def test_something():
       assert 1 == 1
   

3. Convert assertions:

   • self.assertEqual(a, b) → assert a == b
   • self.assertTrue(x) → assert x
   • self.assertRaises(Error) → with pytest.raises(Error):

Phase 9: Updated Compliance Report

Testing Configuration Complete
===============================

Framework: Vitest 2.x (preferred)
Language: TypeScript

Configuration Applied:
  ✅ vitest.config.ts created with best practices
  ✅ Coverage provider configured (@vitest/coverage-v8)
  ✅ Test environment set (jsdom)
  ✅ Watch exclusions configured
  ✅ Coverage thresholds set (80%)

Scripts Added:
  ✅ npm test (run tests once)
  ✅ npm run test:watch (watch mode)
  ✅ npm run test:ui (Vitest UI)
  ✅ npm run test:coverage (with coverage report)

Test Structure:
  ✅ tests/ directory created
  ✅ setup.ts configured
  ✅ Example tests added

Next Steps:
  1. Write your first test:
     npm run test:watch

  2. View test UI:
     npm run test:ui

  3. Check coverage:
     npm run test:coverage

  4. Verify CI integration:
     Check .github/workflows/ for test job

Documentation: docs/TESTING.md

Flags

Examples

# Check compliance and offer fixes
/configure:tests

# Check only, no modifications
/configure:tests --check-only

# Auto-fix all issues
/configure:tests --fix

# Force Vitest even if Jest is detected
/configure:tests --framework vitest

Error Handling

• No package.json found: Cannot configure JS/TS tests, skip or error
• Conflicting frameworks: Warn about multiple test configs, require manual resolution
• Missing dependencies: Offer to install required packages
• Invalid config syntax: Report parse error, offer to replace with template

See Also

• /configure:coverage – Configure coverage thresholds and reporting
• /configure:all – Run all compliance checks
• /test:run – Universal test runner
• /test:setup – Comprehensive testing infrastructure setup
• Vitest documentation: https://vitest.dev
• pytest documentation: https://docs.pytest.org
• cargo-nextest documentation: https://nexte.st