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
416 B
JavaScript
12 lines
416 B
JavaScript
const {differenceBy} = require('./_30s.js');
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test('differenceBy is a Function', () => {
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expect(differenceBy).toBeInstanceOf(Function);
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});
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test('Works using a native function and numbers', () => {
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expect(differenceBy([2.1, 1.2], [2.3, 3.4], Math.floor)).toEqual([1]);
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});
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test('Works with arrow function and objects', () => {
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expect(differenceBy([{ x: 2 }, { x: 1 }], [{ x: 1 }], v => v.x)).toEqual([2]);
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});
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