function validTime(str) {
    //  write code here.
    let [hours, minutes] = str.split(':')
    return (hours >= 0 && hours < 24) && (minutes >= 0 && minutes < 60)
}
/**
* Test Suite 
*/
describe('validTime()', () => {
    it('returns true for valid time', () => {
        // arrange
        const str = '13:58';
        
        // act
        const result = validTime(str);

        // log
        console.log("result 1: ", result);
        
        // assert
        expect(result).toBe(true);
    });

    it('returns false when invalid hours', () => {
        // arrange
        const str = '25:51';
        
        // act
        const result = validTime(str);

        // log
        console.log("result 1: ", result);
        
        // assert
        expect(result).toBe(false);
    });

    it('returns false when invalid minutes', () => {
        // arrange
        const str = '02:76';
        
        // act
        const result = validTime(str);

        // log
        console.log("result 1: ", result);
        
        // assert
        expect(result).toBe(false);
    });
});