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Vitest Test Suite - Implementation Summary

Objective

Add comprehensive test coverage using vitest to achieve as close to 100% coverage as possible.

What Was Implemented

1. Test Infrastructure

  • vitest and @vitest/coverage-v8 installed as dev dependencies
  • vitest.config.ts created with coverage configuration
  • New npm scripts added:
    • npm run test:vitest - Run tests in watch mode
    • npm run test:coverage - Generate coverage report

2. Test Files Created

Core Functionality Tests

  • test/index.test.ts (7 tests)
    • Tests all exports from main entry point
    • Validates type exports
    • Tests error class constructors

Enhanced detectPort Tests

  • test/detect-port-enhanced.test.ts (27 tests)

    • Invalid port handling (negative, > 65535, floats)
    • Different hostname configurations (0.0.0.0, 127.0.0.1, localhost)
    • IPAddressNotAvailableError scenarios
    • Callback mode variations
    • PortConfig edge cases
    • String to number conversion edge cases

  • test/detect-port-advanced.test.ts (5 tests)

    • Multiple consecutive occupied ports
    • Different interface bindings
    • Port 0 (random) selection
    • Complex blocking scenarios

  • test/detect-port-mocking.test.ts (7 tests)

    • DNS error handling attempts
    • Complex port occupation patterns
    • Random port edge cases
    • Multiple interface testing

  • test/detect-port-spy.test.ts (6 tests)

    • Specific interface binding failures
    • Machine IP binding tests
    • Sequential port increment verification

Enhanced waitPort Tests

  • test/wait-port-enhanced.test.ts (13 tests)
    • Timeout and retry handling
    • WaitPortRetryError properties
    • Empty/undefined options handling
    • Sequential wait operations
    • Successful port occupation detection

CLI Tests

  • test/cli-enhanced.test.ts (23 tests)
    • Help flags (-h, --help)
    • Version flags (-v, --version, -V, --VERSION)
    • Port detection with valid ports
    • Verbose mode output
    • Argument parsing
    • Edge cases (port 0, port 1)
    • Output format validation

Integration Tests

  • test/integration.test.ts (12 tests)
    • detectPort and waitPort integration
    • Concurrent port detection
    • Real-world server deployment scenarios
    • Error recovery scenarios
    • Complex workflow patterns
    • Multiple service port allocation

Coverage Achieved

Final Numbers

  • Functions: 100% ✅
  • Lines: 93.1%
  • Branches: 90.32%
  • Statements: 93.1%

Coverage Analysis

Out of 65 lines in the core source files:

  • index.ts: 100% coverage (9 lines)
  • wait-port.ts: 100% coverage (28 lines)
  • detect-port.ts: 90.76% coverage (130 lines)
    • 6 lines uncovered (error handling edge cases)

Uncovered Code

The 6 uncovered lines in detect-port.ts are all error handling paths that require:

  • Port 0 (random) failures
  • DNS ENOTFOUND errors
  • Specific binding sequence failures on multiple interfaces
  • System-level conditions difficult to replicate

See COVERAGE.md for detailed analysis of each uncovered line.

Test Execution

All Tests Pass

$ npm run test:coverage
Test Files  8 passed (8)
Tests  100 passed (100)

Original Tests Still Work

$ npx egg-bin test test/detect-port.test.ts test/wait-port.test.ts test/cli.test.ts
25 passing (3s)

Benefits

  1. Comprehensive Coverage: 93%+ coverage with 100 tests
  2. Better Quality Assurance: Edge cases and error conditions tested
  3. Modern Testing: vitest provides fast, modern testing experience
  4. Maintained Compatibility: Original mocha tests still work
  5. Documentation: Clear documentation of coverage gaps
  6. CI-Ready: Coverage reports can be integrated into CI/CD

Usage

# Run tests
npm run test:vitest

# Generate coverage report
npm run test:coverage

# Run original tests
npm test

Recommendations

To achieve 100% coverage in the future:

  1. Use advanced mocking for node:net module
  2. Mock DNS resolution to trigger ENOTFOUND
  3. Create system-level test environments
  4. Or accept 93%+ as excellent coverage for production code

Files Modified/Created

New Files

  • vitest.config.ts
  • test/index.test.ts
  • test/detect-port-enhanced.test.ts
  • test/detect-port-advanced.test.ts
  • test/detect-port-mocking.test.ts
  • test/detect-port-spy.test.ts
  • test/wait-port-enhanced.test.ts
  • test/cli-enhanced.test.ts
  • test/integration.test.ts
  • COVERAGE.md
  • TEST_SUMMARY.md (this file)

Modified Files

  • package.json - Added vitest dependencies and scripts

Preserved Files

  • All original test files remain functional
  • No changes to source code