It looks like the current implementation may not handle the case where the first player $($head of the list$)$ needs to be replaced properly, especially when inserting p$3$ before p$1.$

$***$test case

public void testA$12()\{$

c $=$ conceal$($HigherScore$.$getInstance$())$;

p$1=$ new Player$("$joe$1",10,$ Position.Quarterback$)$;

p$2=$ new Player$("$joe$2",20,$ Position.Defensive$\_$Line$)$;

p$3=$ new Player$("$joe$",30,$ Position.Kicker$)$;

p$1.$addInPriority$($p$3,$ c$)$;

p$1.$addInPriority$($p$2,$ c$)$;

testPlayers$($p$3,$ p$2,$ p$1)$;

$\}$

$**$My method

public void addInPriority$($Player p$,$ Comparator priority$)\{$

$//$ TODO: Implement this method. No loops, only recursion.

$//$

$//$ NB: While Team happens to call this method only on the head of the list,

$//$ we can't assume all classes that utilize Player will do so$.$ That is why

$//$ we must consider all scenarios, including those where this method is

$//$ called on a player in the middle or end of the list.

int a $=$ priority.compare$($p$,$ this$)$;

$/**$

$*$ Left of this and Immediate left is null

$*$ add p left with mumtiples players

$*/$

if$($a $>0)\{$

if$($this$.$prev $==$ null $)\{$

p$.$next $=$ this;

this.prev $=$ p;

$\}$

else $\{$

this.prev.addInPriority$($p$,$ priority$)$;

$\}$

$\}$

$/**$

$*$ right of this, and immediate right null

$*$ add p right with multiples players

$*/$

else if$($a $<0)\{$

if$($this$.$next $==$null$)\{$

this.next $=$ p;

p$.$prev $=$ this;

$\}$

else $\{$

this.next.addInPriority$($p$,$ priority$)$;

$\}$

$\}$

$/**$

$*$ equal to this

$*/$

else $\{$

if$($this$.$next $!=$ null$)\{$

this.next.prev $=$ p;

p$.$next $=$ this.next;

$\}$

this.next $=$ p;

p$.$prev $=$ this;

$\}$

$\}$