43 lines
1.2 KiB
JavaScript
43 lines
1.2 KiB
JavaScript
import { expect } from 'chai';
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import u from '../lib';
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describe('u.ifElse', () => {
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it('does updates with the else if the predicate is false', () => {
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const object = { a: 0 };
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const result = u.ifElse(false, { b: 1 }, { b: 2 }, object);
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expect(result).to.eql({ a: 0, b: 2 });
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});
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it('updates with the true update if the predicate is true', () => {
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const object = { a: 0 };
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const result = u.ifElse(true, { b: 1 }, { b: 4 }, object);
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expect(result).to.eql({ a: 0, b: 1 });
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});
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it('will use the result of a function passed as a predicate', () => {
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const object = { a: 0 };
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const aIsThree = x => x.a === 3;
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const result = u.ifElse(aIsThree, { b: 1 }, { b: 4 }, object);
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expect(result).to.eql({ a: 0, b: 4 });
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});
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it('can be partially applied', () => {
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const object = { a: 2 };
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const isEven = x => x % 2 === 0;
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const inc = x => x + 1;
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const dec = x => x - 1;
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const result = u({
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a: u.ifElse(isEven, inc, dec),
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}, object);
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expect(result).to.eql({ a: 3 });
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});
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it('freezes the result', () => {
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expect(Object.isFrozen(u.ifElse(true, {}, {}, {}))).to.be.true;
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expect(Object.isFrozen(u.ifElse(false, {}, {}, {}))).to.be.true;
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});
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});
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