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