import { objKeys , getOwnPropNames } from '../src' ; describe ( '#util' , ( ) => { describe ( '#objKeys' , ( ) => { it ( 'should return array of strings' , ( ) => { const obj = { foo : 1 , bar : 1 } ; const keys = [ 'foo' , 'bar' ] ; expect ( objKeys ( obj ) ) . toMatchObject ( keys ) ; } ) ; } ) ; describe ( '#getOwnPropNames' , ( ) => { it ( 'should return own properties' , ( ) => { class Parent { foo = 1 ; } class Child extends Parent { bar = 1 ; } const expected = [ 'foo' , 'bar' ] ; expect ( getOwnPropNames ( new Child ( ) ) ) . toMatchObject ( expected ) ; } ) ; } ) ; } ) ;