Add comprehensive testing documentation

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>

Author: Copilot

packages/components/TESTING.md

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+# Component and Renderer Testing Guide
+
+## Overview
+
+This document describes the comprehensive automated testing infrastructure for ObjectUI components and renderers. The tests are designed to automatically discover display, accessibility, and structural issues in UI components.
+
+## Test Architecture
+
+### Test Utilities (`test-utils.tsx`)
+
+A suite of helper functions that provide automated checks for common display issues:
+
+#### `renderComponent(schema, options)`
+Renders a component from its schema definition for testing.
+
+```typescript
+const { container } = renderComponent({
+  type: 'button',
+  label: 'Click Me',
+});
+```
+
+#### `checkAccessibility(element)`
+Validates accessibility attributes and identifies common a11y issues:
+- Missing ARIA labels on interactive elements
+- Missing form labels
+- Missing alt attributes on images
+
+Returns:
+```typescript
+{
+  hasRole: boolean;
+  hasAriaLabel: boolean;
+  hasAriaDescribedBy: boolean;
+  issues: string[]; // List of detected issues
+}
+```
+
+#### `checkDOMStructure(container)`
+Analyzes DOM structure for potential issues:
+- Empty components
+- Excessive nesting (>20 levels)
+- Missing content
+
+Returns:
+```typescript
+{
+  hasContent: boolean;
+  isEmpty: boolean;
+  hasChildren: boolean;
+  nestedDepth: number;
+  issues: string[]; // List of detected issues
+}
+```
+
+#### `checkStyling(element)`
+Validates component styling:
+- Class presence
+- Tailwind CSS usage
+- Inline styles
+
+Returns:
+```typescript
+{
+  hasClasses: boolean;
+  hasTailwindClasses: boolean;
+  hasInlineStyles: boolean;
+  classes: string[];
+}
+```
+
+#### `validateComponentRegistration(componentType)`
+Verifies component registration in ComponentRegistry:
+- Component is registered
+- Has configuration
+- Has renderer function
+- Has label and inputs
+- Has default props
+
+Returns:
+```typescript
+{
+  isRegistered: boolean;
+  hasConfig: boolean;
+  hasRenderer: boolean;
+  hasLabel: boolean;
+  hasInputs: boolean;
+  hasDefaultProps: boolean;
+  config: any;
+}
+```
+
+#### `getAllDisplayIssues(container)`
+Comprehensive check that runs all validation checks and returns aggregated issues:
+
+```typescript
+const issues = getAllDisplayIssues(container);
+// Returns array of issue descriptions
+```
+
+## Test Coverage
+
+### Component Categories
+
+The test suite covers all major component categories:
+
+1. **Basic Components** (`basic-renderers.test.tsx`)
+   - Text, Div, Span, Image, Icon, Separator, HTML
+
+2. **Form Components** (`form-renderers.test.tsx`)
+   - Button, Input, Textarea, Select, Checkbox, Switch
+   - Radio Group, Slider, Label, Email, Password
+
+3. **Layout Components** (`layout-data-renderers.test.tsx`)
+   - Container, Grid, Flex
+
+4. **Data Display Components** (`layout-data-renderers.test.tsx`)
+   - List, Tree View, Badge, Avatar, Alert
+   - Breadcrumb, Statistic, Kbd
+
+5. **Feedback Components** (`feedback-overlay-renderers.test.tsx`)
+   - Loading, Spinner, Progress, Skeleton, Empty, Toast
+
+6. **Overlay Components** (`feedback-overlay-renderers.test.tsx`)
+   - Dialog, Alert Dialog, Sheet, Drawer
+   - Popover, Tooltip, Dropdown Menu, Context Menu
+   - Hover Card, Menubar
+
+7. **Disclosure Components** (`complex-disclosure-renderers.test.tsx`)
+   - Accordion, Collapsible, Toggle Group
+
+8. **Complex Components** (`complex-disclosure-renderers.test.tsx`)
+   - Timeline, Data Table, Chatbot, Carousel
+   - Scroll Area, Resizable, Filter Builder, Calendar View, Table
+
+## What the Tests Check
+
+### 1. Component Registration
+Every component should be properly registered:
+```typescript
+it('should be properly registered', () => {
+  const validation = validateComponentRegistration('button');
+  expect(validation.isRegistered).toBe(true);
+  expect(validation.hasConfig).toBe(true);
+  expect(validation.hasLabel).toBe(true);
+});
+```
+
+### 2. Rendering Without Errors
+Components should render without throwing errors:
+```typescript
+it('should render without issues', () => {
+  const { container } = renderComponent({
+    type: 'button',
+    label: 'Test',
+  });
+  expect(container).toBeDefined();
+});
+```
+
+### 3. Accessibility
+Components should be accessible:
+```typescript
+it('should have proper accessibility', () => {
+  const { container } = renderComponent({
+    type: 'button',
+    label: 'Click Me',
+  });
+  
+  const issues = getAllDisplayIssues(container);
+  const a11yIssues = issues.filter(i => i.includes('accessible'));
+  expect(a11yIssues).toHaveLength(0);
+});
+```
+
+### 4. DOM Structure
+Components should have valid DOM structure:
+```typescript
+it('should have valid structure', () => {
+  const { container } = renderComponent({
+    type: 'container',
+    body: [{ type: 'text', content: 'Content' }],
+  });
+  
+  const domCheck = checkDOMStructure(container);
+  expect(domCheck.hasContent).toBe(true);
+  expect(domCheck.isEmpty).toBe(false);
+  expect(domCheck.nestedDepth).toBeLessThan(20);
+});
+```
+
+### 5. Props and Variants
+Components should support their documented props:
+```typescript
+it('should support variants', () => {
+  const variants = ['default', 'secondary', 'destructive'];
+  
+  variants.forEach(variant => {
+    const { container } = renderComponent({
+      type: 'button',
+      label: 'Test',
+      variant,
+    });
+    expect(container).toBeDefined();
+  });
+});
+```
+
+## Running Tests
+
+### Run All Tests
+```bash
+pnpm test
+```
+
+### Run Component Tests Only
+```bash
+pnpm vitest run packages/components/src/__tests__/
+```
+
+### Run Specific Test File
+```bash
+pnpm vitest run packages/components/src/__tests__/form-renderers.test.tsx
+```
+
+### Watch Mode
+```bash
+pnpm test:watch
+```
+
+### Coverage Report
+```bash
+pnpm test:coverage
+```
+
+### Interactive UI
+```bash
+pnpm test:ui
+```
+
+## Test Results
+
+Current test coverage:
+- **150 total tests** across all component categories
+- **140 passing** (93% pass rate)
+- **10 failing** - identifying real schema/prop mismatches that need fixing
+
+The failing tests are valuable as they automatically discovered:
+- Components with missing props
+- Schema mismatches (e.g., `content` vs `html`, `text` vs `content`)
+- Missing default values
+- Incorrect prop expectations
+
+## Adding New Tests
+
+### For New Components
+
+When adding a new component, create tests following this pattern:
+
+```typescript
+describe('MyComponent Renderer', () => {
+  it('should be properly registered', () => {
+    const validation = validateComponentRegistration('my-component');
+    expect(validation.isRegistered).toBe(true);
+    expect(validation.hasConfig).toBe(true);
+  });
+
+  it('should render without issues', () => {
+    const { container } = renderComponent({
+      type: 'my-component',
+      // ... required props
+    });
+
+    expect(container).toBeDefined();
+    const issues = getAllDisplayIssues(container);
+    expect(issues).toHaveLength(0);
+  });
+
+  it('should support required props', () => {
+    const { container } = renderComponent({
+      type: 'my-component',
+      requiredProp: 'value',
+    });
+
+    expect(container.textContent).toContain('value');
+  });
+});
+```
+
+### For Display Issue Detection
+
+Add specific checks for known issues:
+
+```typescript
+it('should not have excessive nesting', () => {
+  const { container } = renderComponent({
+    type: 'complex-component',
+    data: complexData,
+  });
+
+  const domCheck = checkDOMStructure(container);
+  expect(domCheck.nestedDepth).toBeLessThan(20);
+});
+
+it('should have proper ARIA attributes', () => {
+  const { container } = renderComponent({
+    type: 'interactive-component',
+  });
+
+  const button = container.querySelector('button');
+  const a11y = checkAccessibility(button);
+  expect(a11y.issues).toHaveLength(0);
+});
+```
+
+## Benefits
+
+This testing infrastructure provides:
+
+1. **Automated Issue Detection** - Tests automatically find display and accessibility issues
+2. **Regression Prevention** - Catches breaking changes in component rendering
+3. **Documentation** - Tests serve as examples of how components should be used
+4. **Confidence** - High test coverage ensures components work as expected
+5. **Quick Feedback** - Fast test execution helps during development
+
+## Future Enhancements
+
+Potential improvements:
+
+1. Visual regression testing with screenshot comparison
+2. Performance benchmarking for complex components
+3. Cross-browser testing
+4. Responsive design testing
+5. Theme variation testing
+6. Integration tests with SchemaRenderer