13 lines
397 B
JavaScript
13 lines
397 B
JavaScript
const expect = require('expect');
|
|
const {sumBy} = require('./_30s.js');
|
|
|
|
test('sumBy is a Function', () => {
|
|
expect(sumBy).toBeInstanceOf(Function);
|
|
});
|
|
test('Works with a callback.', () => {
|
|
expect(sumBy([{ n: 4 }, { n: 2 }, { n: 8 }, { n: 6 }], o => o.n)).toBe(20);
|
|
});
|
|
test('Works with a property name.', () => {
|
|
expect(sumBy([{ n: 4 }, { n: 2 }, { n: 8 }, { n: 6 }], 'n')).toBe(20);
|
|
});
|