test : Add comprehensive unit test coverage for Skeleton, Slider, Sonner, and Switch UI with 100%

Issue Summary

Current Behavior: The Skeleton, Slider, Sonner, and Switch components currently lack comprehensive unit test coverage. This increases the risk of regressions and reduces confidence when making future changes.

Expected Behavior: All four components should have complete unit test coverage including rendering, props validation, events, accessibility checks, edge cases, and user interactions with 100% coverage.

Problem Statement

What is missing:

Unit tests for the following UI components are missing or incomplete:

Skeleton component
Slider component
Sonner toaster component
Switch component

Who is affected:

Developers working on UI components
QA team (increased manual testing effort)
Future contributors modifying these components

Impact:

Risk of regressions
No automated verification of UI behavior
Reduced confidence during refactoring
Incomplete coverage reports
Increased maintenance risk

Reproduction Steps:

Run:

npm run test:coverage

Result:

Coverage for these components is missing or incomplete.

Proposed Solution

Approach:

Create comprehensive unit test files using Vitest and React Testing Library
Cover rendering, props, events, accessibility, and edge cases
Add required polyfills for Radix UI components
Ensure tests follow project conventions
Achieve 100% coverage without modifying production code

Components/files to change:

File	Action
tests/src/components/ui/skeleton.test.tsx	Create
tests/src/components/ui/slider.test.tsx	Create
tests/src/components/ui/sonner.test.tsx	Create
tests/src/components/ui/switch.test.tsx	Create
tests/setup.ts	Modify (polyfills)
tsconfig.tests.json	Create
vitest.config.ts	Modify

Dependencies:

None

Test-Driven Development

Acceptance Criteria (Given-When-Then)

Scenario 1: Skeleton renders correctly

Given the Skeleton component is rendered
When the component loads
Then it should render with default classes
And accept custom className props

Scenario 2: Slider handles values and interactions

Given the Slider component is rendered with value props
When the slider value changes
Then the component should update correctly
And call event handlers

Scenario 3: Sonner toaster renders and handles toast events

Given the Sonner toaster component is rendered
When toast notifications are triggered
Then notifications should display correctly
And support toast options

Scenario 4: Switch handles checked and disabled states

Given the Switch component is rendered
When the switch is toggled
Then checked state should update
And disabled state should prevent interaction

Scenario 5: Accessibility validation

Given UI components are rendered
When accessibility attributes are inspected
Then ARIA attributes should be present
And keyboard navigation should work

Test Cases

Test ID	Test Description	Precondition	Test Steps	Expected Result	Priority
TC-001	Skeleton renders	None	Render component	Default classes present	High
TC-002	Skeleton custom class	None	Render with className	Classes merged	High
TC-003	Slider value handling	None	Render with value	Value displayed correctly	High
TC-004	Slider disabled state	None	Render disabled	Interaction blocked	High
TC-005	Sonner toast render	None	Trigger toast	Toast displayed	Medium
TC-006	Switch toggle	None	Click switch	State changes	High
TC-007	Switch disabled	None	Disable switch	No toggle allowed	High
TC-008	Accessibility checks	None	Inspect ARIA	Attributes present	Medium

Unit Test Requirements

Components/Functions to Test:

Module/Component	Function	Test Cases
src/components/ui/skeleton.tsx	Skeleton	TC-001, TC-002
src/components/ui/slider.tsx	Slider	TC-003, TC-004
src/components/ui/sonner.tsx	Toaster	TC-005
src/components/ui/switch.tsx	Switch	TC-006, TC-007

Test Assertions Required:

Implementation Details

Files to Change

File Path	Action	Purpose
tests/src/components/ui/skeleton.test.tsx	Create	Skeleton tests
tests/src/components/ui/slider.test.tsx	Create	Slider tests
tests/src/components/ui/sonner.test.tsx	Create	Sonner tests
tests/src/components/ui/switch.test.tsx	Create	Switch tests
tests/setup.ts	Modify	Add polyfills
tsconfig.tests.json	Create	Test configuration
vitest.config.ts	Modify	Path alias support

Technical Considerations

Radix UI requires jsdom polyfills
ResizeObserver polyfill required
Pointer events polyfill required
matchMedia polyfill required
ForwardRef testing required
Tailwind class merging validation required

UI/UX Requirements

Component behavior:

Skeleton:

Loading animation
Default styling
Accepts HTML attributes

Slider:

Track and thumb interaction
Value updates
Keyboard navigation

Sonner:

Toast display
Theme support
Toast configuration

Switch:

Toggle interaction
Disabled state styling
Accessibility support

Accessibility Requirements:

Proper ARIA attributes
Keyboard navigation support
Focus indicators

Testing Strategy

Manual Testing

Test Environment:

Browser: Chrome, Firefox
Viewport: Desktop
User Role: All users

Manual Test Steps:

Render components
Verify interactions
Verify disabled states
Verify accessibility behavior

Automated Testing

Unit Tests:

Component render tests
User interaction tests
Error handling tests
Accessibility tests

Integration Tests:

Component interaction tests

Coverage Target:

100%

Test Data Requirements

Example mock data:

const mockTestData = { sliderValue: [50], rangeValue: [25,75], switchState: true, toastMessage: "Test notification" }

Definition of Done

Additional Context

Related Issues

Related to test coverage improvements for UI components.

References

Testing tools used:

Vitest
React Testing Library
Radix UI documentation

Notes

Only test files added
No production code modified
Improves maintainability
Reduces regression risks
Follows project testing standards

Edited Mar 28, 2026 by Prashanth