23 lines
730 B
JavaScript
23 lines
730 B
JavaScript
const expect = require('expect');
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const {promisify} = require('./_30s.js');
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test('promisify is a Function', () => {
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expect(promisify).toBeInstanceOf(Function);
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});
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const x = promisify(Math.max);
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test('Returns a promise', () => {
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expect(x() instanceof Promise).toBeTruthy();
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});
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test('Runs the function provided', () => {
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const delay = promisify((d, cb) => setTimeout(cb, d));
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return delay(200).then(() => expect(true).toBeTruthy());
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});
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test('Resolves a callback result', () => {
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const resolve1 = promisify(cb => cb(null, 1));
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return expect(resolve1()).resolves.toBe(1);
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});
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test('Rejects on error', () => {
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const reject = promisify(cb => cb('error', null));
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return expect(reject()).rejects.toMatch('error');
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});
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