13 lines
453 B
JavaScript
13 lines
453 B
JavaScript
const expect = require('expect');
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const {averageBy} = require('./_30s.js');
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test('averageBy is a Function', () => {
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expect(averageBy).toBeInstanceOf(Function);
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});
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test('Produces the right result with a function', () => {
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expect(averageBy([{ n: 4 }, { n: 2 }, { n: 8 }, { n: 6 }], o => o.n)).toBe(5);
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});
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test('Produces the right result with a property name', () => {
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expect(averageBy([{ n: 4 }, { n: 2 }, { n: 8 }, { n: 6 }], 'n')).toBe(5);
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});
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