java - NullPointerException in JUnit Test -

i'm doing tests app , when send null catch nullpointerexception. method still contines test present error. how can avoid it?.

testservice.java

integer number = null;  servicetotest service;  try{     service.methodtotest(number); } catch(exception e){ //do stuff }

servicetotest.java

public void methodtotest(integer number){    if(number != null) //do stuff }

i tried if(number.equals(null)) have same exception

use

@test(expected=nullpointerexception.class)

instead of

@test

and error-message go away.

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