test: added test cases to increase test coverage of AssignDoctorPage

Issue Summary

Add comprehensive test cases to increase the test coverage of the AssignDoctorPage component.

Current Behavior:
The AssignDoctorPage has limited test coverage, leaving key UI interactions, API calls, and edge cases unverified.

Expected Behavior:
The component should have high test coverage, including rendering, user interactions, API integration, error handling, and edge cases.

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Problem Statement

• Missing or insufficient test coverage for AssignDoctorPage
• Critical user flows such as doctor assignment are not fully tested
• UI states (loading, success, error) may break without detection
• Lack of confidence in making future changes

Impact:

• Increased risk of regressions
• Unreliable UI behavior in production
• Reduced maintainability

Reproduction:

• Run coverage report → observe low or missing coverage for AssignDoctorPage

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Proposed Solution

• Write unit and integration tests using React Testing Library
• Mock API calls and dependencies
• Cover all UI states and interactions:
  • Initial render
  • Form interaction
  • API success/failure
  • Edge cases

Files involved:

• src/pages/volunteer/AssignDoctorPage.tsx
• `tests/unit/components/AssignDoctorPage.test.tsx

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Test-Driven Development

Test Cases

Test ID	Test Description	Precondition	Test Steps	Expected Result	Priority
TC-001	Render page	Component mounted	1. Load page	UI renders correctly	High
TC-002	Successful assignment	Valid input	1. Fill form 2. Submit	Success message shown	High
TC-003	API failure	API mocked to fail	1. Submit form	Error message displayed	High
TC-004	Validation check	Empty fields	1. Submit form	Validation errors shown	High
TC-005	Loading state	API delay	1. Submit form	Loader visible	Medium

Unit Test Requirements

Components/Functions to Test:

Module/Component	Function/Hook	Test Cases to Cover
AssignDoctorPage.tsx	Render logic	TC-001
	Form submission handler	TC-002, TC-003
	Validation logic	TC-004
	Loading state handling	TC-005

Test Assertions Required:

• Renders correctly with initial state
• Handles user input correctly
• Validates input and shows errors
• Calls API with correct payload
• Handles loading state
• Handles success response
• Handles error response
• Updates UI state appropriately

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Implementation Details

Files to Change

File Path	Action	Purpose
`tests/unit/components/AssignDoctorPage.test.tsx	Modify	Add test cases

Testing Strategy

Manual Testing

Test Environment:

• Browser: [Chrome/Firefox]
• Viewport: [Desktop]
• User Role: [admin/volunteer]

Manual Test Steps:

1. Navigate to Assign Doctor page
2. Fill in required fields
3. Submit form
4. Verify success/error behavior

Automated Testing

Unit Tests:

• Component render tests
• User interaction tests
• API integration tests
• Error handling tests

Integration Tests (if applicable):

• Multi-component interaction tests
• Route navigation tests

Test Data Requirements

const mockTestData = { patientId: "patient-123", doctorId: "doctor-456", };

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Definition of Done

• Acceptance criteria met (all Given-When-Then scenarios pass)
• All test cases executed and passing
• Unit tests written and passing (minimum coverage: __%)
• Manual testing completed
• Code reviewed and approved
• UI matches design specifications (if applicable)
• Responsive on all required viewport sizes
• Accessibility checks passed (aria labels, keyboard navigation)
• No console errors or warnings
• TypeScript types defined (no any)
• ESLint/Prettier checks pass
• Documentation updated (if applicable)
• i18n strings externalized (no hardcoded text)

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