TEST-008: Test Newsletter Form Component

[jeromehardaway]

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Priority: P1 - High
Effort: Small (2-3 hours)
File: src/components/forms/newsletter-form.test.tsx

Description

Create focused test suite for the newsletter subscription form component. This high-visibility component appears across multiple pages and requires reliable email validation and subscription handling to maintain user trust and data integrity.

Test Cases

Rendering

• ✅ Renders correctly with email input field
• ✅ Renders submit button with correct text
• ✅ Displays placeholder text appropriately

Validation

• ✅ Email validation (valid formats)
• ✅ Email validation (invalid formats: missing @, no domain, etc.)
• ✅ Empty email submission prevented
• ✅ Whitespace-only email rejected

Subscription Flow

• ✅ Subscription success workflow
• ✅ Success message displayed after subscription
• ✅ Form cleared after successful subscription
• ✅ Submit button disabled during submission

Error Handling

• ✅ Duplicate email handling (already subscribed)
• ✅ Error states displayed correctly
• ✅ Network error handling
• ✅ API failure error messages
• ✅ Invalid email server-side validation errors

UI States

• ✅ Loading state during API call
• ✅ Button disabled state while submitting
• ✅ Success state styling
• ✅ Error state styling

Acceptance Criteria

• 80% component coverage minimum
• All user interactions tested
• API endpoint properly mocked (success, duplicate, error scenarios)
• No console errors or warnings during tests
• Email validation matches production behavior
• Tests run in <2 seconds
• All visual states verified

Technical Notes

• Use React Testing Library for component testing
• Mock newsletter API with msw or jest.mock
• Use userEvent.type() for email input simulation
• Test with @testing-library/jest-dom matchers
• Verify email sent to correct API endpoint
• Test rate limiting if implemented

Testing Strategy

1. Rendering tests: Verify component structure
2. Validation tests: Test email format validation
3. Success path: Test complete subscription flow
4. Error scenarios: Test duplicate and failure cases
5. Accessibility: Verify keyboard and screen reader support

Edge Cases to Cover

• Multiple rapid submissions
• Email with special characters
• International email formats
• Copy-pasted emails with leading/trailing spaces
• Form submission after previous error
• Browser autofill interactions

Accessibility Considerations

• Keyboard navigation (Tab, Enter)
• ARIA labels on email input
• Error announcements for screen readers
• Focus management on success/error states
• Loading state announced to assistive technology

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