function depositProfit(deposit, rate, threshold) {
    //formula for calculation: deposit(1 + (rate / 100)^years)
    let years
    let amount = 0
    const interestRate = (1 + (rate / 100)) 
    
    for (years = 1; amount <= threshold; years++) {
        amount = deposit * Math.pow(interestRate, years)
    }
    return years - 1
}



/**
* Test Suite 
*/
describe('depositProfit()', () => {
    it('returns number of years it will take to hit threshold based off of deposit & rate', () => {
        // arrange
        const deposit = 100;
        const rate = 20;
        const threshold = 170;
        
        // act
        const result = depositProfit(deposit, rate, threshold)

        // log
        console.log("result: ", result);
        
        // assert
        expect(result).toBe(3);
    });
});