Try to fix a few tests

src/test/resources/de/hhu/stups/codegenerator/Assert.mch

 MACHINE Assert
 
-VARIABLES  floor
+VARIABLES  level
 
-INVARIANT  floor : 0..99 /* NAT */
+INVARIANT  level : 0..99 /* NAT */
 
-INITIALISATION floor := 0
+INITIALISATION level := 0
 
 OPERATIONS
 
-	inc = ASSERT floor<99 THEN floor := floor + 1 END ;
+	inc = ASSERT level<99 THEN level := level + 1 END ;
 
-	dec = ASSERT floor>0 THEN floor := floor - 1 END
+	dec = ASSERT level>0 THEN level := level - 1 END
 
 END
\ No newline at end of file

src/test/resources/de/hhu/stups/codegenerator/Lift.mch

 MACHINE Lift
 
-VARIABLES  floor
+VARIABLES  level
 
-INVARIANT  floor : 0..100 /* NAT */
+INVARIANT  level : 0..100 /* NAT */
 
-INITIALISATION floor := 0
+INITIALISATION level := 0
 
 OPERATIONS
 
-	inc = PRE floor<100 THEN floor := floor + 1 END ;
+	inc = PRE level<100 THEN level := level + 1 END ;
 
-	dec = PRE floor>0 THEN floor := floor - 1 END
+	dec = PRE level>0 THEN level := level - 1 END
 
 END
\ No newline at end of file

src/test/resources/de/hhu/stups/codegenerator/Lift_External.mch

 MACHINE Lift_External
 
-VARIABLES  floor
+VARIABLES  level
 
-INVARIANT  floor : 0..100 /* NAT */
+INVARIANT  level : 0..100 /* NAT */
 
-INITIALISATION floor := 0
+INITIALISATION level := 0
 
 OPERATIONS
 
-	inc = PRE floor<100 THEN floor := floor + 1 END ;
-	dec = PRE floor>0 THEN floor := floor - 1 END;
+	inc = PRE level<100 THEN level := level + 1 END ;
+	dec = PRE level>0 THEN level := level - 1 END;
 	EXTERNAL_SEND = skip
 
 END
\ No newline at end of file