22 lines
533 B
JavaScript
22 lines
533 B
JavaScript
const expect = require('expect');
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const {isPromiseLike} = require('./_30s.js');
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test('isPromiseLike is a Function', () => {
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expect(isPromiseLike).toBeInstanceOf(Function);
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});
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test('Returns true for a promise-like object', () => {
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expect(
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isPromiseLike({
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then() {
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return '';
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}
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})
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).toBeTruthy();
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});
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test('Returns false for an empty object', () => {
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expect(isPromiseLike({})).toBeFalsy();
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});
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test('Returns false for a normal function', () => {
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expect(isPromiseLike(Math.max)).toBeFalsy();
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});
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