20 lines
628 B
JavaScript
20 lines
628 B
JavaScript
const {yesterday} = require('./_30s.js');
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test('yesterday is a Function', () => {
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expect(yesterday).toBeInstanceOf(Function);
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});
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test('Returns the correct type', () => {
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expect(typeof yesterday()).toBe('string');
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});
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const t1 = new Date(new Date().getFullYear(), new Date().getMonth(), new Date().getDate() - 1);
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const t2 = new Date(yesterday());
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test('Returns the correct year', () => {
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expect(t1.getFullYear()).toBe(t2.getFullYear());
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});
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test('Returns the correct month', () => {
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expect(t1.getMonth()).toBe(t2.getMonth());
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});
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test('Returns the correct date', () => {
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expect(t1.getDate()).toBe(t2.getDate());
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});
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