Add return on investment algorithm to Maths by InukaWijerathna · Pull Request #1906 · TheAlgorithms/JavaScript

@@ -0,0 +1,35 @@ import { returnOnInvestment } from '../ReturnOnInvestment'
describe('returnOnInvestment', () => { test('positive ROI when gain exceeds cost', () => { expect(returnOnInvestment(1000, 500)).toBe(100) })
test('zero ROI when gain equals cost', () => { expect(returnOnInvestment(500, 500)).toBe(0) })
test('negative ROI when gain is less than cost', () => { expect(returnOnInvestment(200, 500)).toBe(-60) })
test('total loss when gain is zero', () => { expect(returnOnInvestment(0, 500)).toBe(-100) })
test('throws RangeError for zero cost', () => { expect(() => returnOnInvestment(1000, 0)).toThrow(RangeError) })
test('throws RangeError for negative cost', () => { expect(() => returnOnInvestment(1000, -100)).toThrow(RangeError) })
test('throws TypeError for non-number gain', () => { expect(() => returnOnInvestment('1000', 500)).toThrow(TypeError) })
test('throws TypeError for non-number cost', () => { expect(() => returnOnInvestment(1000, '500')).toThrow(TypeError) }) })