Fullstack Testing Skill

Atomic skill for testing including unit tests, integration tests, and E2E tests.

Responsibility

Single Purpose: Write and manage tests for fullstack applications

Actions

write_unit_test

Write unit tests for a component or function.

// Input
{
  action: "write_unit_test",
  test_framework: "vitest",
  target: "src/services/user.service.ts"
}

// Output
{
  success: true,
  test_code: "describe('UserService', () => {...})",
  files: [
    { path: "src/services/user.service.test.ts", content: "..." }
  ],
  coverage: { statements: 85, branches: 80, functions: 90, lines: 85 }
}

write_integration_test

Write integration tests for API endpoints.

write_e2e_test

Write E2E tests for user flows.

analyze_coverage

Analyze test coverage and identify gaps.

Validation Rules

function validateParams(params: SkillParams): ValidationResult {
  if (!params.action) {
    return { valid: false, error: "action is required" };
  }

  if (params.action !== 'analyze_coverage' && !params.target) {
    return { valid: false, error: "target required for test writing" };
  }

  return { valid: true };
}

Error Handling

Error Code	Description	Recovery
TARGET_NOT_FOUND	Test target not found	Verify file path
FRAMEWORK_UNSUPPORTED	Test framework not supported	Check supported frameworks
COVERAGE_BELOW_THRESHOLD	Coverage below target	Add more tests
FLAKY_TEST_DETECTED	Test is non-deterministic	Fix race condition

Logging Hooks

{
  "on_invoke": "log.info('fullstack-testing invoked', { action, target })",
  "on_success": "log.info('Test created', { files, coverage })",
  "on_error": "log.error('Testing skill failed', { error })"
}

Unit Test Template

import { describe, it, expect } from 'vitest';
import { fullstackTesting } from './fullstack-testing';

describe('fullstack-testing skill', () => {
  describe('write_unit_test', () => {
    it('should create test file with proper structure', async () => {
      const result = await fullstackTesting({
        action: 'write_unit_test',
        test_framework: 'vitest',
        target: 'src/services/user.service.ts'
      });

      expect(result.success).toBe(true);
      expect(result.test_code).toContain('describe');
      expect(result.test_code).toContain('it(');
    });

    it('should include arrange-act-assert pattern', async () => {
      const result = await fullstackTesting({
        action: 'write_unit_test',
        target: 'src/utils/format.ts'
      });

      expect(result.test_code).toMatch(/Arrange|Act|Assert/);
    });
  });

  describe('analyze_coverage', () => {
    it('should identify untested code paths', async () => {
      const result = await fullstackTesting({
        action: 'analyze_coverage',
        coverage_threshold: 80
      });

      expect(result.success).toBe(true);
      expect(result.coverage).toBeDefined();
    });
  });
});

Integration

• Bonded Agent: 06-testing-strategy
• Upstream Skills: frontend-development, backend-development
• Downstream Skills: devops-fullstack

Version History

Version	Date	Changes
1.0.0	2024-01	Initial release
2.0.0	2025-01	Production-grade upgrade with Playwright patterns