updeep-remeda/test/reject-spec.js

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import { expect } from 'chai'
import u from '../lib'
describe('u.reject', () => {
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it('can reject by index', () => {
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const result = u.reject((_, index) => index === 1, [3, 4, 5])
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expect(result).to.eql([3, 5])
})
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it('can reject with callback shorthand', () => {
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const result = u.reject('bad', [{ bad: true }, { bad: false }])
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expect(result).to.eql([{ bad: false }])
})
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it("returns the same instance if reject doesn't make changes", () => {
const object = { foo: [1, 2, 3] }
const result = u(
{
foo: u.reject(x => x === 'Justin Bieber'),
},
object
)
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expect(result).to.equal(object)
})
it('returns a different instance if reject makes changes', () => {
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const object = { foo: [1, 2, 3, 4] }
const result = u(
{
foo: u.reject(x => x === 4),
},
object
)
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expect(result).to.not.equal(object)
})
it('freezes the result', () => {
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expect(Object.isFrozen(u.reject('a', []))).to.be.true
})
})