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import { binary } from './binary.js'
test('happy', () => {  const result = binary(function (    x, y, z  ){    expect(arguments).toHaveLength(2)    expect(z).toBeUndefined()    expect(x).toBe(10)    expect(y).toBe(20)
    return x + y  })(    10, 20, 30  )  expect(result).toBe(30)})