How would you create a test program for the following code?

public class Fraction $\{$

private int numerator;

private int denominator;

public Fraction$()\{$

numerator $=0$;

denominator $=1$;

$\}$

public Fraction$($int num, int denom$)\{$

if $($denom $==0)\{$

throw new IllegalArgumentException$("$Denominator cannot be zero."$)$;

$\}$

numerator $=$ num;

denominator $=$ denom;

$\}$

public Fraction$($String fString$)\{$

String$[]$ parts $=$ fString.split$("/")$;

numerator $=$ Integer.parseInt$($parts$[0])$;

denominator $=$ Integer.parseInt$($parts$[1])$;

if $($denominator $==0)\{$

throw new IllegalArgumentException$("$Denominator cannot be zero."$)$;

$\}$

$\}$

public String getFraction$()\{$

return numerator $+"/"+$ denominator;

$\}$

public double getDecimal$()\{$

return $(($double$)$numerator$)/$ denominator;

$\}$

public int getNumerator$()\{$

return numerator;

$\}$

public int getDenominator$()\{$

return denominator;

$\}$

public String toString$()\{$

return getFraction$()+"$ or $"+$ String.format$("\%\mathrm{.}4$f$",$ getDecimal$())$;

$\}$

public boolean equals$($Object obj$)\{$

if $($obj instanceof Fraction$)\{$

Fraction other $=($Fraction$)$ obj;

return numerator $*$ other.denominator $==$ other.numerator $*$ denominator;

$\}$

return false;

$\}$

$\}$