method BadNbr$($a: array$)$ returns $($bn: int$)$

$\{$

$//$ Step $1$: Check the edge case for an array with fewer than $2$ elements

if a$.$Length $<mtext></mtext><mn>2</mn><mtext></mtext><mi>\{</mi>$

return $-1$;

$\}$

$//$ Step $2$: Initialize bn to $-1$ to indicate no bad neighbor found by default

bn :$=-1$;

var n :$=$ a$.$Length;

$//$ Step $3$: Check the wrap$-$around pair $($last element with the first element$)$

if a$[$n$-1]+$ a$[0]<mtext></mtext><mn>0</mn><mtext></mtext><mi>\{</mi>$

return $0$; $//$ The first element is a bad neighbor

$\}$

$//$ Step $4$: Iterate over each consecutive pair in the array

var i :$=0$;

while i $$ n $-1\{$

$//$ Check if the sum of current and next element is negative

if a$[$i$]+$ a$[$i $+1]<mtext></mtext><mn>0</mn><mtext></mtext><mi>\{</mi>$

return i $+1$; $//$ Return the index of the first bad neighbor found

$\}$

i :$=$ i $+1$;

$\}$

$//$ Step $5$: If no bad neighbor is found, return $-1$

return $-1$;

$\}$

method TestBadNbr$()\{$

$//$ Test case $1$: Empty array

var arr$1$ :$=$ new int$[0]$;

var res$1$ :$=$ BadNbr$($arr$1)$;

assert res$1==-1$;

$//$ Test case $2$: Array with one element

var arr$2$ :$=$ new int$[1]$;

arr$2[0]$ :$=5$;

var res$2$ :$=$ BadNbr$($arr$2)$;

assert res$2==-1$;

$//$ Test case $3$: Array with two elements where sum is negative

var arr$3$ :$=$ new int$[2]$;

arr$3[0]$ :$=1$;

arr$3[1]$ :$=-2$;

var res$3$ :$=$ BadNbr$($arr$3)$;

assert res$3==1$;

$//$ Test case $4$: Array with three elements and a bad neighbor pair

var arr$4$ :$=$ new int$[3]$;

arr$4[0]$ :$=3$;

arr$4[1]$ :$=-4$;

arr$4[2]$ :$=1$;

var res$4$ :$=$ BadNbr$($arr$4)$;

assert res$4==1$;

$//$ Test case $5$: Array with four elements and a wrap$-$around bad neighbor pair

var arr$5$ :$=$ new int$[4]$;

arr$5[0]$ :$=2$;

arr$5[1]$ :$=-1$;

arr$5[2]$ :$=3$;

arr$5[3]$ :$=-4$;

var res$5$ :$=$ BadNbr$($arr$5)$;

assert res$5==3$;

$//$ Additional test case: No bad neighbor

var arr$6$ :$=$ new int$[3]$;

arr$6[0]$ :$=3$;

arr$6[1]$ :$=2$;

arr$6[2]$ :$=1$;

var res$6$ :$=$ BadNbr$($arr$6)$;

assert res$6==-1$;

$//$ Additional test case: Only wrap$-$around is a bad neighbor

var arr$7$ :$=$ new int$[4]$;

arr$7[0]$ :$=-1$;

arr$7[1]$ :$=2$;

arr$7[2]$ :$=3$;

arr$7[3]$ :$=-4$;

var res$7$ :$=$ BadNbr$($arr$7)$;

assert res$7==0$;

$\}$

why will assertion not hold? how do I fix this?