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x/rambda/mergeLeft.spec.js

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import { mergeLeft } from './mergeLeft'
const obj = { foo : 1, bar : 2,}
test('happy', () => { expect(mergeLeft({ bar : 20 }, obj)).toEqual({ foo : 1, bar : 20, })})
test('curry', () => { expect(mergeLeft({ baz : 3 })(obj)).toEqual({ foo : 1, bar : 2, baz : 3, })})
test('when undefined or null instead of object', () => { expect(mergeLeft(null, undefined)).toEqual({}) expect(mergeLeft(obj, null)).toEqual(obj) expect(mergeLeft(obj, undefined)).toEqual(obj) expect(mergeLeft(undefined, obj)).toEqual(obj)})