30 lines
916 B
JavaScript
30 lines
916 B
JavaScript
const {all} = require('./_30s.js');
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test('all is a Function', () => {
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expect(all).toBeInstanceOf(Function);
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});
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test('Returns true for arrays with no falsy values', () => {
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expect(all([4, 1, 2, 3])).toBeTruthy();
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});
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test('Returns false for arrays with 0', () => {
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expect(all([0, 1])).toBeFalsy();
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});
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test('Returns false for arrays with NaN', () => {
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expect(all([NaN, 1])).toBeFalsy();
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});
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test('Returns false for arrays with undefined', () => {
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expect(all([undefined, 1])).toBeFalsy();
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});
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test('Returns false for arrays with null', () => {
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expect(all([null, 1])).toBeFalsy();
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});
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test('Returns false for arrays with empty strings', () => {
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expect(all(['', 1])).toBeFalsy();
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});
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test('Returns true with predicate function', () => {
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expect(all([4, 1, 2, 3], x => x >= 1)).toBeTruthy();
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});
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test('Returns false with a predicate function', () => {
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expect(all([0, 1], x => x >= 1)).toBeFalsy();
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});
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