mirror of
https://github.com/streamich/react-use.git
synced 2025-12-08 18:02:14 +00:00
8de2a3ee13
chore: move all the tests to the separate directory outside of sources; chore: remove jest.config.js (config moved to the package.json); test: unused import in test; test: 💍 fix tests add back x and y to useMeasure chore: 🤖 add linter to /tests folder ci: 🎡 limit Jest worker count for CircleCI
24 lines
635 B
TypeScript
24 lines
635 B
TypeScript
import { renderHook } from '@testing-library/react-hooks';
|
|
import usePrevious from '../src/usePrevious';
|
|
|
|
const setUp = () => renderHook(({ state }) => usePrevious(state), { initialProps: { state: 0 } });
|
|
|
|
it('should return undefined on initial render', () => {
|
|
const { result } = setUp();
|
|
|
|
expect(result.current).toBeUndefined();
|
|
});
|
|
|
|
it('should always return previous state after each update', () => {
|
|
const { result, rerender } = setUp();
|
|
|
|
rerender({ state: 2 });
|
|
expect(result.current).toBe(0);
|
|
|
|
rerender({ state: 4 });
|
|
expect(result.current).toBe(2);
|
|
|
|
rerender({ state: 6 });
|
|
expect(result.current).toBe(4);
|
|
});
|