Show me the steps to solve:

package simplegame;

import static org.junit.jupiter.api.Assertions.$*$;

import org.junit.jupiter.api.Test;

public class SimpleGameTest $\{$

@Test

void testConvertTime$()\{$

SimpleGame game $=$ new SimpleGame$()$;

assertEquals$("23$:$59$:$59",$ game.convertTime$(86399))$;

assertEquals$("0$:$23$:$52",$ game.convertTime$(1432))$;

assertEquals$("-1$:$-1$:$-1",$ game.convertTime$(-1))$;

assertEquals$("0$:$0$:$0",$ game.convertTime$(0))$;

assertEquals$("2$:$46$:$40",$ game.convertTime$(10000))$;

$\}$

private void assertEquals$($String string, String convertTime$)\{$

$//$ TODO Auto$-$generated method stub

$\}$

@Test

void testDigitsSummation$()\{$

SimpleGame game $=$ new SimpleGame$()$;

assertEquals$(18,$ game.digitsSummation$(2394))$;

assertEquals$(16,$ game.digitsSummation$(565))$;

assertEquals$(7,$ game.digitsSummation$(7))$;

assertEquals$(0,$ game.digitsSummation$(0))$;

$\}$

private void assertEquals$($int i$,$ int digitsSummation$)\{$

$//$ TODO Auto$-$generated method stub

$\}$

$\}$