27 lines
697 B
JavaScript
27 lines
697 B
JavaScript
const expect = require('expect');
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const {factorial} = require('./_30s.js');
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test('factorial is a Function', () => {
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expect(factorial).toBeInstanceOf(Function);
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});
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test('Calculates the factorial of 720', () => {
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expect(factorial(6)).toBe(720);
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});
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test('Calculates the factorial of 0', () => {
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expect(factorial(0)).toBe(1);
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});
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test('Calculates the factorial of 1', () => {
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expect(factorial(1)).toBe(1);
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});
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test('Calculates the factorial of 4', () => {
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expect(factorial(4)).toBe(24);
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});
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test('Calculates the factorial of 10', () => {
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expect(factorial(10)).toBe(3628800);
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});
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test('Throws TypeError if n < 0', () => {
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expect(() => {
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factorial(-1);
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}).toThrow(TypeError);
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});
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