function centuryFromYear(num) {
    if (num < 1) {
        throw 'year must be 1 or greater';
    }
    
    if (num % 100 > 0) {
        return Math.floor(num / 100) + 1;    
    } else {
        return num / 100;
    }
}



/**
* Test Suite 
*/
describe('centuryFromYear()', () => {
    it('returns current century', () => {
        // arrange
        const year = 1905;
        
        // act
        const result = centuryFromYear(year);

        // log
        console.log("result 1: ", result);
        
        // assert
        expect(result).toBe(20);
    });
    
    it('returns current century for edge case of start of century', () => {
        // arrange
        const year = 1700;
        
        // act
        const result = centuryFromYear(year);

        // log
        console.log("result 2: ", result);
        
        // assert
        expect(result).toBe(17);
    });    
});