Fixed test_mvc.py tests

integration/code/pm_pn_reachability.mvc

@@ -30,9 +30,15 @@ ProcessModel combo_reach {
     Next (reachability_print, finish) {}
 
     Produces (initializePN, pn) {}
-    Consumes (refinePN, pn) {}
+    Consumes (refinePN, pn) {
+        name = "pn"
+    }
     Produces (refinePN, pn) {}
-    Consumes (reachability, pn) {}
+    Consumes (reachability, pn) {
+        name = "pn"
+    }
     Produces (reachability, reachability_graph) {}
-    Consumes (reachability_print, reachability_graph) {}
+    Consumes (reachability_print, reachability_graph) {
+        name = "reachability_graph"
+    }
 }