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/**
* @jest-environment jsdom
*/
import { polyfilledLocalStorage as localStorage } from '../local-storage';
beforeEach( () => {
localStorage.clear();
} );
describe( 'length', () => {
it( 'should return 0 when localStorage is empty', () => {
expect( localStorage.length ).toBe( 0 );
} );
it( 'should return the correct length after items are added', () => {
localStorage.setItem( 'key1', 'value1' );
expect( localStorage.length ).toBe( 1 );
localStorage.setItem( 'key2', 'value2' );
expect( localStorage.length ).toBe( 2 );
localStorage.setItem( 'key3', 'value3' );
localStorage.setItem( 'key4', 'value4' );
expect( localStorage.length ).toBe( 4 );
} );
it( 'should return the correct length after items are added and removed', () => {
localStorage.setItem( 'key1', 'value1' );
localStorage.setItem( 'key2', 'value2' );
localStorage.removeItem( 'key1' );
expect( localStorage.length ).toBe( 1 );
localStorage.setItem( 'key3', 'value3' );
localStorage.setItem( 'key4', 'value4' );
localStorage.removeItem( 'key3' );
expect( localStorage.length ).toBe( 2 );
} );
} );
describe( 'key', () => {
it( 'should return null for any index if localStorage is empty', () => {
expect( localStorage.key( 0 ) ).toBe( null );
expect( localStorage.key( 5 ) ).toBe( null );
expect( localStorage.key( 200 ) ).toBe( null );
expect( localStorage.key( -1 ) ).toBe( null );
} );
it( 'should return the key at the given index if there are elements in localStorage', () => {
localStorage.setItem( 'key1', 'value1' );
localStorage.setItem( 'key2', 'value2' );
expect( localStorage.key( 0 ) ).toBe( 'key1' );
expect( localStorage.key( 1 ) ).toBe( 'key2' );
} );
it( 'should return null if there are elements in localStorage and the index is out of bounds', () => {
localStorage.setItem( 'key1', 'value1' );
localStorage.setItem( 'key2', 'value2' );
expect( localStorage.key( 2 ) ).toBe( null );
expect( localStorage.key( -1 ) ).toBe( null );
} );
} );
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