👌 IMPROVE: Added test case for ProjectEuler Problem001

Project-Euler/Problem001.js

@@ -5,9 +5,11 @@ Find the sum of all the multiples of 3 or 5 below the provided parameter value n
 */
 
 const multiplesThreeAndFive = (num) => {
+ if (num < 1) throw new Error('No natural numbers exist below 1')
+
  let total = 0
  // total for calculating the sum
- for (let i = 0; i < num; i++) {
+ for (let i = 1; i < num; i++) {
  if (i % 3 === 0 || i % 5 === 0) {
  total += i
  }

Project-Euler/test/Problem001.test.js

@@ -0,0 +1,17 @@
+import { multiplesThreeAndFive } from '../Problem001.js'
+
+describe('Sum of multiples of 3 or 5', () => {
+ it('should throw error when number is negative number', () => {
+ expect(() => multiplesThreeAndFive(-24)).toThrowError('No natural numbers exist below 1')
+ })
+ it('should throw error when number is 0', () => {
+ expect(() => multiplesThreeAndFive(0)).toThrowError('No natural numbers exist below 1')
+ })
+ test('if the number is greater than 0', () => {
+ expect(multiplesThreeAndFive(10)).toBe(23)
+ })
+ // Project Euler Condition Check
+ test('if the number is 1000', () => {
+ expect(multiplesThreeAndFive(1000)).toBe(233168)
+ })
+})