83a6a6ea32
* chore: make aware eslint that we use jest By setting up the jest environment, we no longer need to declare the 'test' global in the configuration. * chore: don't need to import expect, it's a jest environment global * chore: don't need to import expect when creating undefined test
12 lines
363 B
JavaScript
12 lines
363 B
JavaScript
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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});
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