39 lines
940 B
TypeScript
39 lines
940 B
TypeScript
import isLeapYear from './leap'
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describe('A leap year', () => {
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it('is not very common', () => {
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expect(isLeapYear(2015)).toBeFalsy()
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})
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it('is introduced every 4 years to adjust about a day', () => {
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expect(isLeapYear(2016)).toBeTruthy()
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})
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it('is skipped every 100 years to remove an extra day', () => {
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expect(isLeapYear(1900)).toBeFalsy()
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})
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it('is reintroduced every 400 years to adjust another day', () => {
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expect(isLeapYear(2000)).toBeTruthy()
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})
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describe('Additional example of a leap year that', () => {
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it('is not a leap year', () => {
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expect(isLeapYear(1978)).toBeFalsy()
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})
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it('is a common leap year', () => {
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expect(isLeapYear(1992)).toBeTruthy()
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})
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it('is skipped every 100 years', () => {
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expect(isLeapYear(2100)).toBeFalsy()
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})
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it('is reintroduced every 400 years', () => {
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expect(isLeapYear(2400)).toBeTruthy()
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})
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})
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})
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