import { includes } from './includes'; describe( 'includes', () => { const array = [ 1, 2, 3 ]; test( 'can check if the array includes a certain value or not.', () => { expect( includes( array, 1 ) ).toBe( true ); expect( includes( array, 2 ) ).toBe( true ); expect( includes( array, 3 ) ).toBe( true ); expect( includes( array, 5 ) ).toBe( false ); expect( includes( array, 'a' as any ) ).toBe( false ); expect( includes( array, true as any ) ).toBe( false ); } ); } );