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/**
* @jest-environment jsdom
*/
import { render } from '@testing-library/react';
import { Interval, EVERY_SECOND, EVERY_MINUTE } from '../index';
jest.useFakeTimers();
describe( 'Interval', () => {
test( 'Does not run onTick() on mount', () => {
const spy = jest.fn();
render( <Interval onTick={ spy } period={ EVERY_SECOND } /> );
expect( spy ).not.toHaveBeenCalled();
} );
test( 'Runs onTick() on the intervals', () => {
const spy = jest.fn();
render( <Interval onTick={ spy } period={ EVERY_SECOND } /> );
jest.advanceTimersByTime( 1000 );
expect( spy ).toHaveBeenCalledTimes( 1 );
} );
test( 'Respects the period passed', () => {
const spy = jest.fn();
render( <Interval onTick={ spy } period={ EVERY_MINUTE } /> );
jest.advanceTimersByTime( 1000 * 60 );
expect( spy ).toHaveBeenCalledTimes( 1 );
} );
test( 'Stops running the interval on unmount', () => {
const spy = jest.fn();
const { unmount } = render( <Interval onTick={ spy } period={ EVERY_SECOND } /> );
jest.advanceTimersByTime( 1000 );
expect( spy ).toHaveBeenCalledTimes( 1 );
unmount();
jest.advanceTimersByTime( 2000 );
expect( spy ).toHaveBeenCalledTimes( 1 );
} );
test( 'Changes the interval when the period changes', () => {
const spy = jest.fn();
const { rerender } = render( <Interval onTick={ spy } period={ EVERY_SECOND } /> );
jest.advanceTimersByTime( 1000 );
expect( spy ).toHaveBeenCalledTimes( 1 );
rerender( <Interval onTick={ spy } period={ EVERY_MINUTE } /> );
jest.advanceTimersByTime( 1000 );
expect( spy ).toHaveBeenCalledTimes( 1 );
jest.advanceTimersByTime( 60 * 1000 );
expect( spy ).toHaveBeenCalledTimes( 2 );
} );
test( 'Picks up a new ticker even if the period does not change', () => {
const spy = jest.fn();
const otherSpy = jest.fn();
const { rerender } = render( <Interval onTick={ spy } period={ EVERY_SECOND } /> );
jest.advanceTimersByTime( 1000 );
expect( spy ).toHaveBeenCalledTimes( 1 );
rerender( <Interval onTick={ otherSpy } period={ EVERY_SECOND } /> );
expect( spy ).toHaveBeenCalledTimes( 1 );
expect( otherSpy ).not.toHaveBeenCalled();
jest.advanceTimersByTime( 1000 );
expect( spy ).toHaveBeenCalledTimes( 1 );
expect( otherSpy ).toHaveBeenCalledTimes( 1 );
} );
} );
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