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import {inc} from './inc'import {isNil} from './isNil'import {unless} from './unless'
test('happy', () => {  const safeInc = unless(isNil, inc)  expect(safeInc(null)).toBeNull()  expect(safeInc(1)).toBe(2)})
test('curried', () => {  const safeIncCurried = unless(isNil)(inc)  expect(safeIncCurried(null)).toBeNull()})