So you want to check several values at once, maybe because that helps you to locate the error more easily. Simple:
int v1 = list1.size();
int v2 = list2.size();
int v3 = list3.size();
assertEquals (
"list1=5\n"
+ "list2=2\n"
+ "list3=0\n"
, "list1="+v1+"\n"
+ "list2="+v2+"\n"
+ "list3="+v3+"\n"
Posted by digulla