HumanReadableTime.java

package main.java.kyu5;

/**
 * 5 kyu - Human Readable time
 *
 * https://www.codewars.com/kata/52685f7382004e774f0001f7
 *
 * Details:
 *
 * Write a function, which takes a non-negative integer (seconds) as input and returns the time
 * in a human-readable format (HH:MM:SS)
 *
 *     HH = hours, padded to 2 digits, range: 00 - 99
 *     MM = minutes, padded to 2 digits, range: 00 - 59
 *     SS = seconds, padded to 2 digits, range: 00 - 59
 *
 * The maximum time never exceeds 359999 (99:59:59)
 *
 * You can find some examples in the test fixtures.
 */

import org.junit.Test;

import static org.junit.Assert.assertEquals;

public class HumanReadableTime {
    public static String makeReadable(int seconds) {
        int minutes = seconds / 60;
        int hours = minutes / 60;
        minutes -= hours * 60;
        return String.format("%02d:%02d:%02d", hours, minutes, seconds % 60);
    }

    @Test
    public void tests() {
        assertEquals("makeReadable(0)", "00:00:00", HumanReadableTime.makeReadable(0));
        assertEquals("makeReadable(5)", "00:00:05", HumanReadableTime.makeReadable(5));
        assertEquals("makeReadable(60)", "00:01:00", HumanReadableTime.makeReadable(60));
        assertEquals("makeReadable(86399)", "23:59:59", HumanReadableTime.makeReadable(86399));
        assertEquals("makeReadable(359999)", "99:59:59", HumanReadableTime.makeReadable(359999));
    }
}