when executed assertEquals(Groups.groupCheck("({"), false); output gives expected: but was:...how??

i worte the same code but i used if(n==0||n%n==0) return 0; i was not getting output any idea why

thanks...

i changed the poisition of line and i got.but how to handle null pointer exception???

i m getting output for basic test...just getting stuck in those exception case.i m using java

the code i wrote gives corrects output.But while running it here it shows 3 errors stating symbol not defined.Don't know why.