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32 lines
997 B
JavaScript
32 lines
997 B
JavaScript
import { calcFactorial } from '../Factorial'
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describe('calcFactorial', () => {
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it('should return a statement for value "0"', () => {
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expect(calcFactorial(0)).toBe('The factorial of 0 is 1.')
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})
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it('should return a statement for "null" and "undefined"', () => {
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const nullFactorial = calcFactorial(null)
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const undefinedFactorial = calcFactorial(undefined)
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expect(nullFactorial).toBe(
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'Sorry, factorial does not exist for null or undefined numbers.'
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)
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expect(undefinedFactorial).toBe(
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'Sorry, factorial does not exist for null or undefined numbers.'
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)
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})
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it('should not support negative numbers', () => {
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const negativeFactorial = calcFactorial(-5)
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expect(negativeFactorial).toBe(
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'Sorry, factorial does not exist for negative numbers.'
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)
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})
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it('should return the factorial of a positive number', () => {
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const positiveFactorial = calcFactorial(3)
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expect(positiveFactorial).toBe('The factorial of 3 is 6')
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})
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})
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