11 lines
417 B
JavaScript
11 lines
417 B
JavaScript
const expect = require('expect');
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const coalesceFactory = require('./coalesceFactory.js');
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test('coalesceFactory is a Function', () => {
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expect(coalesceFactory).toBeInstanceOf(Function);
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});
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const customCoalesce = coalesceFactory(_ => ![null, undefined, '', NaN].includes(_));
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test('Returns a customized coalesce function', () => {
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expect(customCoalesce(undefined, null, NaN, '', 'Waldo')).toEqual('Waldo');
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});
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