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