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import {add} from './add'import {filter} from './filter'import {map} from './map'import {piped} from './piped'
test('happy', () => {  const result = piped(    [1, 2, 3],    filter(x => x > 1),    map(x => x * 10),    map(add(1))  )  const expectedResult = [21, 31]
  expect(result).toEqual(expectedResult)})