diff --git a/class.mc b/class.mc
index 96a6cd8..00107c4 100644
--- a/class.mc
+++ b/class.mc
@@ -2,15 +2,14 @@
 
 @{
 
-  classCopy(class) {
-    {values: clone(class.values), functions: clone(class.functions)};
-  }
-
   initClass(class) {
     out = {};
     if (class == null) {
       out.values = {};
       out.functions = {};
+    } else {
+      out = {values: clone(class.values), functions: clone(class.functions)};
+
     }
     out;
   }
diff --git a/tests-parsimony/testFile.c b/tests-parsimony/testFile.c
index c6c6c05..9145c0a 100644
--- a/tests-parsimony/testFile.c
+++ b/tests-parsimony/testFile.c
@@ -2,40 +2,32 @@
 
 @{
   //creation of the class
-  P = initClass();
-  P.values.x = "null";
-  P.values.y = "null";
-  P.values.z = "null";
-  P.functions.printf = "null";
+  P                   = initClass();
+  P.values.x          = "null";
+  P.values.y          = "null";
   printf(p) { // Can we create a self variable or somthing like that ?
-    print("Object P : ");
-    print(p);
-    print("\n");
+    print("P(", p.values.x, ", ", p.values.y, ")\n");
   }
-  P.functions.printf = printf;
+  P.functions.printf  = printf;
 
   // To know if the parameter is known
-  print("\n");
-  (P.values.x != null) ? print("yes\n") : print("no\n");
-  (P.values.w != null) ? print("yes\n") : print("no\n");
-  print("\n");
+  (P.values.x != null) ? print("\nyes") : print("\nno");
+  (P.values.w != null) ? print("\nyes\n\n") : print("\nno\n\n");
 
   // Use of the P class
-  x = new(P, {x: 2, y: 4, z: 6, w: 9});
+  x = new(P, { x: 2, y: 4, z: 6 });
   x.functions.printf(x);
 
   // Create another class from P
-  Q = classCopy(P);
-  Q.values.q = "null";
+  Q           = initClass(P);
+  Q.values.z  = "null";
   printf(q) {
-    print("Object Q : ");
-    print(q);
-    print("\n");
+    print("Q(", q.values.x, ", ", q.values.y, ", ", q.values.z, ")\n");
   }
   Q.functions.printf = printf;
 
   // Use of the Q class
-  y = new(Q, {x: 1, y: 2, z: 3, q: 42 });
+  y = new(Q, { x: 1, y: 2, z: 3 });
   y.functions.printf(y);
 
   nil;
diff --git a/tests-parsimony/testFile2.c b/tests-parsimony/testFile2.c
index e0be8db..068f5fd 100644
--- a/tests-parsimony/testFile2.c
+++ b/tests-parsimony/testFile2.c
@@ -2,11 +2,15 @@
 
 @{
   //creation of the object class
-  Object = initClass();
+  Object      = initClass();
   Object.type = "object";
-  type_t = { type_Nil: 0, type_Int: 1, type_Pair: 2};
+  type_t      = { type_Nil: 0, type_Int: 1, type_Pair: 2};
   printf(x) {
     switch (x.type) {
+      case type_t.type_Nil: {
+        print("Nil");
+        return;
+      }
       case type_t.type_Int: {
         print(x.values.value);
         return;
@@ -14,7 +18,7 @@
       case type_t.type_Pair: {
         print("(");
         printf(x.values.a);
-        print(", ");
+        print(" . ");
         printf(x.values.d);
         print(")");
         return;
@@ -24,24 +28,30 @@
   Object.functions.printf = printf;
   
   // from object
-  Nil = classCopy(Object);
-  Nil.type = type_t.type_Nil;
-  Int = classCopy(Object);
-  Int.values.value = "null";
-  Int.type = type_t.type_Int;
-  Pair = classCopy(Object);
-  Pair.values.a = "null";
-  Pair.values.d = "null";
-  Pair.type = type_t.type_Pair;
+  // Nil
+  Nil               = initClass(Object);
+  Nil.type          = type_t.type_Nil;
+  // Int
+  Int               = initClass(Object);
+  Int.values.value  = "null";
+  Int.type          = type_t.type_Int;
+  // Pair
+  Pair              = initClass(Object);
+  Pair.values.a     = "null";
+  Pair.values.d     = "null";
+  Pair.type         = type_t.type_Pair;
   
   // function to simplify the writting of example
-  newNil(x)     { new(Nil, {}); }
-  newInt(x)     { new(Int, {value: x}); }
+  newNil(x)     { new(Nil , {            }); }
+  newInt(x)     { new(Int , { value: x   }); }
   newPair(x, y) { new(Pair, { a: x, d: y }); }
   
   // example 
-  l = newPair(newInt(1), newPair(newInt(2), newPair(newInt(3), newNil())))
+  l = newPair(newInt(1), newPair(newInt(2), newPair(newInt(3), newNil())));
   l.functions.printf(l);
+  print("\n");
+  s = newInt(1);
+  s.functions.printf(s);
   
   nil;
 }
\ No newline at end of file