Jest Testing Suite Template

Create a Jest testing setup for:

Project Type: {{PROJECT_TYPE}} (React/Node/Library)
Testing Scope: {{SCOPE}} (unit/integration/e2e)
Coverage Target: {{COVERAGE_TARGET}}%

Generate complete testing infrastructure:

1. **Jest Configuration (jest.config.js):**
   - Module mapping
   - Transform configuration
   - Coverage thresholds
   - Test environment setup
   - Global setup/teardown
   - Reporter configuration

2. **Test Utilities (test-utils/):**
   - Custom render functions
   - Mock factories
   - Test data builders
   - Assertion helpers

3. **Mock Setup (__mocks__/):**
   - Module mocks
   - API mocks
   - Browser API mocks
   - Third-party library mocks

4. **Fixtures (__fixtures__/):**
   - Sample data files
   - Response fixtures
   - Configuration fixtures

5. **Test Templates:**
   - Unit test structure
   - Integration test structure
   - Snapshot test patterns
   - Async test patterns

6. **Coverage Configuration:**
   - Coverage collection
   - Threshold enforcement
   - Report formats
   - Exclusion patterns

7. **CI Integration:**
   - Test scripts
   - Coverage upload
   - Parallel execution
   - Test splitting

8. **Best Practices:**
   - AAA pattern (Arrange, Act, Assert)
   - Test naming conventions
   - Isolation strategies
   - Cleanup patterns

Include examples for common testing scenarios.