React Unit Testing

[cemnec]

Task

React: Unit Testing

Screenshot

Deployment

https://cemnec.github.io/rs-react/

Done / Deadline

Done: 2026-05-10
Deadline: 2026-05-12 02:59

Score

100 / 100

• Test Coverage - 14/14

  • Statement coverage is at least 80%
  • Branch, function, and line coverage are at least 50%
  • Final coverage: Statements 98.57%, Branches 96.66%, Functions 100%, Lines 100%

• No Functional Changes - 14/14

  • Class components were not converted to functional components
  • Existing app behavior was preserved
  • Only test-related/testability changes were added

• Behavior-Focused Testing - 14/14

  • Tests check user-visible behavior and component output
  • Tests do not rely on internal state or lifecycle methods

• API Mocking - 14/14

  • External API calls are mocked with Vitest
  • API service is tested separately with mocked fetch
  • App tests mock the API service

• Error Handling - 14/14

  • API error state is tested
  • ErrorBoundary fallback UI is tested
  • Reload action is tested

• User Interactions - 14/14

  • Search input typing is tested
  • Search submit is tested
  • Pagination buttons are tested
  • The Throw Error button is tested

• LocalStorage Functionality Testing - 16/16

  • Search term is restored from localStorage on app start
  • Trimmed search term is saved to localStorage after search
  • Empty and updated localStorage cases are covered