Added normalization tests for “forall” statements.

These tests ensure that universal quantifiers are correctly reduced to
negated existential quantifiers over the negated argument via derived
predicates in preconditions (nested and not) and goal descriptions.

tests/data/normalization/normalization-3.pddl

@@ -0,0 +1,49 @@
+; tests that universal quantifiers in preconditions are correctly reduced
+(define (domain test-normalization)
+	(:predicates
+		(test-predicate-0)
+		(test-predicate-1 ?x)
+		(test-predicate-2 ?x ?y))
+
+	; top-level “forall” statement
+	(:action test-action-1
+		:parameters
+			(?x)
+		:precondition
+			(forall
+				(?x ?y)
+				(test-predicate-2 ?x ?y))
+		:effect
+			(test-predicate-1 ?x))
+
+	; nested “forall” statement
+	(:action test-action-2
+		:parameters
+			(?x)
+		:precondition
+			(and
+				(and
+					(forall
+						(?x ?y)
+						(test-predicate-2 ?x ?y))
+					(test-predicate-0))
+				(test-predicate-0))
+		:effect
+			(test-predicate-1 ?x))
+)
+
+(define (problem test-normalization)
+	(:domain test-normalization)
+
+	(:objects a b c)
+
+	(:init
+		(test-predicate-0))
+
+	; “forall” statement in goal
+	(:goal
+		(and
+			(forall
+				(?x ?y)
+				(test-predicate-2 ?x ?y))
+			(test-predicate-0))))