Add tests verifying NODE KEY works in grammar

Author: Mats-SX

grammar/basic-grammar.xml

@@ -666,6 +666,8 @@
       ALL
       NONE
       SINGLE
+      NODE
+      KEY
     </alt>
   </production>
 

grammar/commands.xml

@@ -53,7 +53,7 @@
   <!-- / NEW CONSTRAINT SYNTAX \ -->
 
   <production name="CreateConstraint">
-    CREATE &SP; CONSTRAINT &SP; <non-terminal ref="ConstraintName"/> &SP;
+    ADD &SP; CONSTRAINT &SP; <non-terminal ref="ConstraintName"/> &SP;
     FOR &SP; <non-terminal ref="ConstraintPattern"/> &SP;
     REQUIRE &SP; <non-terminal ref="ConstraintExpression"/>
   </production>
@@ -75,17 +75,18 @@
 
   <production name="ConstraintExpression">
     <alt>
-      <non-terminal ref="NodePropertyUniquenessConstraint"/>
-      <non-terminal ref="PropertyExistenceConstraint"/>
+      <non-terminal ref="Uniqueness"/>
+      <non-terminal ref="NodeKey"/>
+      <non-terminal ref="Expression"/>
     </alt>
   </production>
 
-  <production name="NodePropertyUniquenessConstraint">
-    UNIQUE &SP; <non-terminal ref="PropertyExpression"/> <repeat>&WS; , &WS; <non-terminal ref="PropertyExpression"/></repeat>
+  <production name="Uniqueness">
+    UNIQUE &SP; <non-terminal ref="PropertyExpression"/>
   </production>
 
-  <production name="PropertyExistenceConstraint">
-    exists ( <non-terminal ref="PropertyExpression"/> )
+  <production name="NodeKey">
+    NODE &SP; KEY &SP; <non-terminal ref="PropertyExpression"/> <repeat>&WS; , &WS; <non-terminal ref="PropertyExpression"/></repeat>
   </production>
 
   <!-- / LEGACY COMMANDS \ -->

tools/grammar/src/test/resources/cypher.txt

@@ -267,16 +267,22 @@ MATCH (a) CALL proc(   )§
 MATCH (a) CALL proc( a, b   ,   c  )§
 MATCH (a) CALL proc( a, b   ,   c  ) YIELD a, b , c§
 CALL proc(   ) RETURN *§
-CREATE CONSTRAINT foo
+ADD CONSTRAINT foo
 FOR (p:Person)
 REQUIRE UNIQUE p.name§
-CREATE CONSTRAINT bar
-FOR (p:Person)
-REQUIRE UNIQUE p.name, p.email§
-CREATE CONSTRAINT baz
+ADD CONSTRAINT baz
 FOR (p:Person)
 REQUIRE exists(p.name)§
-CREATE CONSTRAINT cru
+ADD CONSTRAINT cru
 FOR ()-[r:REL]-()
 REQUIRE exists(r.property)§
 DROP CONSTRAINT foo_bar_baz§
+ADD CONSTRAINT nodeKey
+FOR (n:Node)
+REQUIRE NODE KEY n.prop§
+ADD CONSTRAINT nodeKey
+FOR (n:Node)
+REQUIRE NODE KEY n.p1, n.p2, n.p3§
+ADD CONSTRAINT nodeKey
+FOR (n:Node)
+REQUIRE NODE KEY n.p1   ,n.p2,    n.p3§