diff --git a/test/unionfind_test.cc b/test/unionfind_test.cc
--- a/test/unionfind_test.cc
+++ b/test/unionfind_test.cc
@@ -16,8 +16,6 @@
  *
  */
 
-#include <iostream>
-
 #include <lemon/list_graph.h>
 #include <lemon/maps.h>
 #include <lemon/unionfind.h>
@@ -39,7 +37,7 @@
   U.insert(n[1]);
   U.insert(n[2]);
 
-  check(U.join(n[1],n[2]) != -1,"Test failed.");
+  check(U.join(n[1],n[2]) != -1, "Something is wrong with UnionFindEnum");
 
   U.insert(n[3]);
   U.insert(n[4]);
@@ -48,54 +46,54 @@
   U.insert(n[7]);
 
 
-  check(U.join(n[1],n[4]) != -1,"Test failed.");
-  check(U.join(n[2],n[4]) == -1,"Test failed.");
-  check(U.join(n[3],n[5]) != -1,"Test failed.");
+  check(U.join(n[1],n[4]) != -1, "Something is wrong with UnionFindEnum");
+  check(U.join(n[2],n[4]) == -1, "Something is wrong with UnionFindEnum");
+  check(U.join(n[3],n[5]) != -1, "Something is wrong with UnionFindEnum");
 
 
   U.insert(n[8],U.find(n[5]));
 
 
-  check(U.size(U.find(n[4])) == 3,"Test failed.");
-  check(U.size(U.find(n[5])) == 3,"Test failed.");
-  check(U.size(U.find(n[6])) == 1,"Test failed.");
-  check(U.size(U.find(n[2])) == 3,"Test failed.");
+  check(U.size(U.find(n[4])) == 3, "Something is wrong with UnionFindEnum");
+  check(U.size(U.find(n[5])) == 3, "Something is wrong with UnionFindEnum");
+  check(U.size(U.find(n[6])) == 1, "Something is wrong with UnionFindEnum");
+  check(U.size(U.find(n[2])) == 3, "Something is wrong with UnionFindEnum");
 
 
   U.insert(n[9]);
   U.insert(n[10],U.find(n[9]));
 
 
-  check(U.join(n[8],n[10]) != -1,"Test failed.");
+  check(U.join(n[8],n[10])  != -1, "Something is wrong with UnionFindEnum");
 
 
-  check(U.size(U.find(n[4])) == 3,"Test failed.");
-  check(U.size(U.find(n[9])) == 5,"Test failed.");
+  check(U.size(U.find(n[4])) == 3, "Something is wrong with UnionFindEnum");
+  check(U.size(U.find(n[9])) == 5, "Something is wrong with UnionFindEnum");
 
-  check(U.size(U.find(n[8])) == 5,"Test failed.");
+  check(U.size(U.find(n[8])) == 5, "Something is wrong with UnionFindEnum");
 
   U.erase(n[9]);
   U.erase(n[1]);
 
-  check(U.size(U.find(n[10])) == 4,"Test failed.");
-  check(U.size(U.find(n[2])) == 2,"Test failed.");
+  check(U.size(U.find(n[10])) == 4, "Something is wrong with UnionFindEnum");
+  check(U.size(U.find(n[2]))  == 2, "Something is wrong with UnionFindEnum");
 
   U.erase(n[6]);
   U.split(U.find(n[8]));
 
 
-  check(U.size(U.find(n[4])) == 2,"Test failed.");
-  check(U.size(U.find(n[3])) == 1,"Test failed.");
-  check(U.size(U.find(n[2])) == 2,"Test failed.");
+  check(U.size(U.find(n[4])) == 2, "Something is wrong with UnionFindEnum");
+  check(U.size(U.find(n[3])) == 1, "Something is wrong with UnionFindEnum");
+  check(U.size(U.find(n[2])) == 2, "Something is wrong with UnionFindEnum");
 
 
-  check(U.join(n[3],n[4]) != -1,"Test failed.");
-  check(U.join(n[2],n[4]) == -1,"Test failed.");
+  check(U.join(n[3],n[4]) != -1, "Something is wrong with UnionFindEnum");
+  check(U.join(n[2],n[4]) == -1, "Something is wrong with UnionFindEnum");
 
 
-  check(U.size(U.find(n[4])) == 3,"Test failed.");
-  check(U.size(U.find(n[3])) == 3,"Test failed.");
-  check(U.size(U.find(n[2])) == 3,"Test failed.");
+  check(U.size(U.find(n[4])) == 3, "Something is wrong with UnionFindEnum");
+  check(U.size(U.find(n[3])) == 3, "Something is wrong with UnionFindEnum");
+  check(U.size(U.find(n[2])) == 3, "Something is wrong with UnionFindEnum");
 
   U.eraseClass(U.find(n[4]));
   U.eraseClass(U.find(n[7]));