Add a test for negative

inputs: C#

$[$TestMethod$]$

public void RooterTestNegativeInputx$()$

$\{$

Rooter rooter $=$ new Rooter$()$;

try

$\{$

rooter.SquareRoot$(-10)$;

$\}$

catch $($ArgumentOutOfRangeException e$)$

$\{$

return;

$\}$

Assert.Fail$()$;

$\}$

$2.$ In Test Explorer, choose Run All.

The method under test loops, and must be canceled manually.

$3.$ Choose Cancel.