# Testing Capability Specification

## ADDED Requirements

### Requirement: Jest Test Framework Integration
The system SHALL use Jest as the primary testing framework for all unit, integration, and component tests, configured to work with Next.js and TypeScript.

#### Scenario: Developer runs test suite
- **WHEN** a developer runs `npm test`
- **THEN** Jest discovers and executes all `.test.tsx` and `.test.ts` files
- **AND** test results are displayed with pass/fail summary
- **AND** coverage metrics are calculated and reported

#### Scenario: Coverage thresholds enforced
- **WHEN** test coverage falls below 90%
- **THEN** the test command fails with a threshold error message
- **AND** the error specifies which files/branches are below threshold

### Requirement: Component Testing with React Testing Library
The system SHALL render and test React components in an isolated environment, prioritizing user interactions over implementation details.

#### Scenario: Component renders with props
- **WHEN** a component is rendered with test props
- **THEN** the component displays expected content
- **AND** user interactions (clicks, form input) can be simulated
- **AND** assertions validate rendered DOM, not component internals

#### Scenario: Async component updates tested
- **WHEN** a component performs async operations (API calls, state updates)
- **THEN** the test waits for updates using findBy* queries
- **AND** assertions verify final rendered state

### Requirement: API Client Mocking & Testing
The system SHALL mock external API calls in unit tests, allowing isolated testing of client logic without backend dependencies.

#### Scenario: Successful API response
- **WHEN** an API client method is called with mock data
- **THEN** the mock returns expected response structure
- **AND** Bearer token header is included in request
- **AND** response is parsed and returned to caller

#### Scenario: API error handling
- **WHEN** API returns error (401, 422, 500)
- **THEN** error is caught and appropriate error handler invoked
- **AND** 401 errors trigger automatic logout
- **AND** error message is accessible to component

### Requirement: Authentication Flow Testing
The system SHALL test complete authentication scenarios including login, token storage, and protected route access.

#### Scenario: User login flow
- **WHEN** user submits login credentials
- **THEN** API is called with email and password
- **AND** JWT token is stored in localStorage
- **AND** user is redirected to dashboard
- **AND** useAuth() hook returns authenticated user

#### Scenario: Protected route access
- **WHEN** unauthenticated user navigates to protected route
- **THEN** middleware intercepts request
- **AND** user is redirected to login page
- **AND** intended destination is preserved in query params

### Requirement: Form Validation Testing
The system SHALL test all form validation rules, error display, and submission handling.

#### Scenario: Invalid email rejection
- **WHEN** user enters invalid email format
- **THEN** validation error message displays
- **AND** submit button remains disabled
- **AND** API is not called

#### Scenario: Password confirmation mismatch
- **WHEN** user enters non-matching password confirmation
- **THEN** error message displays immediately
- **AND** form submission is prevented

### Requirement: Accessibility Testing
The system SHALL validate WCAG 2.1 Level AA compliance using automated (axe-core) and manual testing.

#### Scenario: Keyboard navigation
- **WHEN** user navigates page with Tab key only
- **THEN** all interactive elements are reachable
- **AND** focus order is logical
- **AND** focus indicator is visible

#### Scenario: Screen reader compatibility
- **WHEN** screen reader accesses page
- **THEN** all text content is announced
- **AND** form labels are associated with inputs
- **AND** buttons have accessible names

#### Scenario: Color contrast compliance
- **WHEN** page is rendered
- **THEN** text has minimum 4.5:1 contrast ratio
- **AND** interactive elements have 3:1 contrast ratio
- **AND** color is not sole indicator of meaning

### Requirement: Test Coverage Reporting
The system SHALL generate and report test coverage metrics, enforcing minimum thresholds across all production code.

#### Scenario: Coverage report generation
- **WHEN** tests run with coverage flag
- **THEN** Istanbul coverage report is generated
- **AND** global coverage percentage is displayed
- **AND** breakdown by file/directory provided

#### Scenario: Coverage threshold enforcement
- **WHEN** coverage falls below 90%
- **THEN** build/test process fails
- **AND** developer must add tests before proceeding
- **AND** CI/CD rejects commits with insufficient coverage

### Requirement: Mocking Infrastructure & Utilities
The system SHALL provide reusable mock factories and test utilities for consistent, DRY testing patterns.

#### Scenario: Mock API client setup
- **WHEN** test imports mocked api-client
- **THEN** mock methods return configurable responses
- **AND** mock tracks method calls and arguments
- **AND** mock can be reset between tests

#### Scenario: Test helper utility usage
- **WHEN** test uses renderWithProviders() helper
- **THEN** component is rendered with AuthProvider and Router
- **AND** mock data is pre-populated
- **AND** test setup code is minimal (1-2 lines)