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import { mapKeys } from './mapKeys.js'
const obj = {  a : 1,  b : 2,}const changeKeyFn = prop => `${ prop }_foo`const expected = {  a_foo : 1,  b_foo : 2,}
test('happy', () => {  const result = mapKeys(changeKeyFn, obj)
  expect(result).toEqual(expected)})
test('curried', () => {  const result = mapKeys(changeKeyFn)(obj)
  expect(result).toEqual(expected)})