How do I use this:

Exception ex $=$ assertThrows$($RuntimeException$.$class, $()->$ Project$2.$squareRoot$(-4))$;

to test that the method throws an exception because negative square roots aren$$t allowed.

Use the assertThrows$()$ JUnit assertion that takes the class of the expected exception and a lambda expression to run that should throw.

My test method is:

@Test

public void testNegativeCubeRoot$()\{$

$//$ Test cases for cubeRoot

assertEquals$(2,$ Project$2.$cubeRoot$(-8))$;

assertEquals$(3,$ Project$2.$cubeRoot$(-27))$;

assertEquals$(4,$ Project$2.$cubeRoot$(-64))$;

assertEquals$(2,$ Project$2.$cubeRoot$(-9))$;

assertEquals$(1,$ Project$2.$cubeRoot$(-1))$;

$\}$