diff --git a/tests/data/blocksworld-domain.pddl b/tests/data/blocksworld-domain.pddl
index 6fb47e9..8b51e13 100644
--- a/tests/data/blocksworld-domain.pddl
+++ b/tests/data/blocksworld-domain.pddl
@@ -2,44 +2,44 @@
   (:requirements :strips :typing)
   (:types block)
   (:predicates (on ?x - block ?y - block)
-	       (ontable ?x - block)
-	       (clear ?x - block)
-	       (handempty)
-	       (holding ?x - block)
-	       )
+           (ontable ?x - block)
+           (clear ?x - block)
+           (handempty)
+           (holding ?x - block)
+           )
 
   (:action pick-up
-	     :parameters (?x - block)
-	     :precondition (and (clear ?x) (ontable ?x) (handempty))
-	     :effect
-	     (and (not (ontable ?x))
-		   (not (clear ?x))
-		   (not (handempty))
-		   (holding ?x)))
+         :parameters (?x - block)
+         :precondition (and (clear ?x) (ontable ?x) (handempty))
+         :effect
+         (and (not (ontable ?x))
+           (not (clear ?x))
+           (not (handempty))
+           (holding ?x)))
 
   (:action put-down
-	     :parameters (?x - block)
-	     :precondition (holding ?x)
-	     :effect
-	     (and (not (holding ?x))
-		   (clear ?x)
-		   (handempty)
-		   (ontable ?x)))
+         :parameters (?x - block)
+         :precondition (holding ?x)
+         :effect
+         (and (not (holding ?x))
+           (clear ?x)
+           (handempty)
+           (ontable ?x)))
   (:action stack
-	     :parameters (?x - block ?y - block)
-	     :precondition (and (holding ?x) (clear ?y))
-	     :effect
-	     (and (not (holding ?x))
-		   (not (clear ?y))
-		   (clear ?x)
-		   (handempty)
-		   (on ?x ?y)))
+         :parameters (?x - block ?y - block)
+         :precondition (and (holding ?x) (clear ?y))
+         :effect
+         (and (not (holding ?x))
+           (not (clear ?y))
+           (clear ?x)
+           (handempty)
+           (on ?x ?y)))
   (:action unstack
-	     :parameters (?x - block ?y - block)
-	     :precondition (and (on ?x ?y) (clear ?x) (handempty))
-	     :effect
-	     (and (holding ?x)
-		   (clear ?y)
-		   (not (clear ?x))
-		   (not (handempty))
-		   (not (on ?x ?y)))))
+         :parameters (?x - block ?y - block)
+         :precondition (and (on ?x ?y) (clear ?x) (handempty))
+         :effect
+         (and (holding ?x)
+           (clear ?y)
+           (not (clear ?x))
+           (not (handempty))
+           (not (on ?x ?y)))))