19 lines
615 B
JavaScript
19 lines
615 B
JavaScript
const expect = require('expect');
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const {none} = require('./_30s.js');
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test('none is a Function', () => {
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expect(none).toBeInstanceOf(Function);
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});
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test('Returns true for arrays with no truthy values', () => {
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expect(none([0, undefined, NaN, null, ''])).toBeTruthy();
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});
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test('Returns false for arrays with at least one truthy value', () => {
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expect(none([0, 1])).toBeFalsy();
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});
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test('Returns true with a predicate function', () => {
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expect(none([4, 1, 0, 3], x => x < 0)).toBeTruthy();
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});
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test('Returns false with predicate function', () => {
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expect(none([0, 1, 2], x => x === 1)).toBeFalsy();
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});
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