$```$

def divide$\_$numbers$($a$,$ b$)$:

assert b $!=0,$ "Cannot divide by zero"

return a $/$ b

def test$\_$divide$\_$numbers$()$:

try:

result $=$ divide$\_$numbers$(10,2)$

assert result $==5$

print$("$Test case $1$ passed"$)$

result $=$ divide$\_$numbers$(10,0)$

assert result $==$ float$(\text{'}$inf$\text{'})$

print$("$Test case $2$ passed"$)$

except AssertionError as e:

print$($f$"$Test case failed: $\{$str

$($e$)\}")$

$```$

Which of the following statements best describes the purpose of assert, try$/,$ and unit testing in the given code?