This document tracks all testing coverage for this component to ensure comprehensive validation and accessibility compliance.

**Last Updated**: 2025-10-19  
**Test Coverage**: 90%  
**Accessibility Score**: WCAG AA Compliant ✅

## 🧪 Test Summary

### Unit Tests (Vitest)

✅ **51 unit tests** implemented

- Component rendering, properties, events, and methods tested

### ♿ Accessibility Tests

✅ **ARIA attributes and roles tested**
✅ **Keyboard navigation tested**
✅ **Accessibility documented in Storybook**
✅ **Automated accessibility testing (axe-core)**
✅ **Keyboard interaction testing**

### 🖱️ Interactive Tests (Cypress)

✅ **Component testing** implemented

- User interaction testing
- Keyboard navigation testing
- Responsive behavior testing

### 📱 Responsive & Visual Tests

✅ **Storybook stories** available

- 10 visual test scenarios

### 🔧 E2E Integration Tests

⚠️ **E2E tests recommended** for complex workflows

## 📊 Detailed Accessibility Compliance

### WCAG 2.1 AA Requirements

✅ **ARIA Implementation**: Roles, labels, and descriptions properly set
✅ **Keyboard Navigation**: Tab order and keyboard interactions tested
⚠️ **Focus Management**: Focus behavior needs validation
✅ **Automated Testing**: axe-core accessibility validation integrated

### Screen Reader Compatibility

- ⚠️ **Manual testing needed** with VoiceOver, NVDA, and JAWS
- Component should announce purpose, state, and interactions clearly
- Content should be logically structured for screen readers











## 📋 Detailed Unit Test Coverage

The following 47 unit tests ensure comprehensive validation of the component:

### Basic Functionality
- **should create and render correctly**: Should create and render correctly.
- **should have default properties**: Should have default properties.

### Properties
- **should handle flag image changes**: Should handle flag image changes.
- **should handle flag alt text changes**: Should handle flag alt text changes.
- **should handle header text changes**: Should handle header text changes.
- **should handle action text changes**: Should handle action text changes.
- **should handle icon source changes**: Should handle icon source changes.

### Banner Toggle Functionality
- **should toggle expanded state**: Should toggle expanded state.
- **should update ARIA attributes on toggle**: Should update ARIA attributes on toggle.
- **should dispatch banner-toggle event**: Should dispatch banner-toggle event.
- **should handle keyboard navigation**: Tests keyboard navigation and interaction functionality

### Rendering
- **should render banner with correct structure**: Should render banner with correct structure.
- **should render flag image with correct attributes**: Should render flag image with correct attributes.
- **should render header text and action text**: Should render header text and action text.
- **should render toggle button with correct attributes**: Should render toggle button with correct attributes.
- **should render content area with guidance sections**: Should render content area with guidance sections.
- **should render .gov guidance section correctly**: Should render .gov guidance section correctly.
- **should render HTTPS guidance section correctly**: Should render HTTPS guidance section correctly.
- **should render lock SVG icon correctly**: Should render lock SVG icon correctly.

### Expanded State
- **should show content when expanded**: Should show content when expanded.
- **should hide content when collapsed**: Should hide content when collapsed.

### Accessibility
- **should have correct ARIA attributes**: Should have correct ARIA attributes.
- **should have proper image accessibility attributes**: Should have proper image accessibility attributes.
- **should have screen reader friendly content**: Should have screen reader friendly content.
- **should pass comprehensive accessibility tests (same as Storybook)**: Should pass comprehensive accessibility tests (same as Storybook).
- **should pass comprehensive USWDS compliance tests (prevents structural issues)**: Should pass comprehensive USWDS compliance tests (prevents structural issues).

### Government Banner Content
- **should contain required government banner text**: Should contain required government banner text.
- **should have proper media block structure for guidance**: Should have proper media block structure for guidance.

### Event Handling
- **should prevent default on keyboard events**: Should prevent default on keyboard events.
- **should only respond to Enter and Space keys**: Should only respond to Enter and Space keys.

### CRITICAL: Component Lifecycle Stability
- **should remain in DOM after property changes**: Should remain in DOM after property changes.
- **should maintain element stability during banner content updates**: Should maintain element stability during banner content updates.
- **should preserve DOM connection through expansion state changes**: Should preserve DOM connection through expansion state changes.

### CRITICAL: Event System Stability
- **should not pollute global event handling**: Should not pollute global event handling.
- **should maintain stability during banner toggle interactions**: Should maintain stability during banner toggle interactions.
- **should maintain stability during keyboard interactions**: Should maintain stability during keyboard interactions.

### CRITICAL: Banner State Management Stability
- **should maintain DOM connection during asset changes**: Should maintain DOM connection during asset changes.
- **should preserve element stability during text content changes**: Should preserve element stability during text content changes.
- **should maintain stability during complex state transitions**: Should maintain stability during complex state transitions.

### Hidden Attribute Management Regression Tests
- **should sync hidden attribute with expanded state**: Should sync hidden attribute with expanded state.
- **should maintain hidden attribute consistency during multiple toggles**: Should maintain hidden attribute consistency during multiple toggles.
- **should handle rapid property changes without conflicts**: Validates rapid property changes are handled correctly
- **should not have Lit binding conflicts with USWDS toggle behavior**: Should not have Lit binding conflicts with USWDS toggle behavior.
- **should preserve hidden attribute state after DOM updates**: Should preserve hidden attribute state after DOM updates.

### JavaScript Implementation Validation
- **should pass JavaScript implementation validation**: Should pass JavaScript implementation validation.

### CRITICAL: Storybook Integration
- **should render in Storybook-like environment without auto-dismiss**: Should render in Storybook-like environment without auto-dismiss.
- **should handle Storybook args updates without component removal**: Should handle Storybook args updates without component removal.


## 🚨 Testing Gaps & Recommendations

### ✅ Good Coverage

Component has solid test coverage. Continue maintaining and expanding as needed.

## 📝 Test Maintenance

- Tests are automatically tracked when test files change
- Run `npm run test` for unit tests
- Run `npm run cypress:run` for interactive tests
- View `npm run storybook` for visual tests
- Accessibility tests integrated in CI/CD pipeline

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_This testing registry is automatically maintained by git hooks and scripts._  
_See `docs/TESTING_DOCUMENTATION.md` for automation details._