added test for subquery in query

Author: transistive

src/Query.php

@@ -21,6 +21,7 @@
 
 namespace WikibaseSolutions\CypherDSL;
 
+use Closure;
 use WikibaseSolutions\CypherDSL\Clauses\CallClause;
 use WikibaseSolutions\CypherDSL\Clauses\CallProcedureClause;
 use WikibaseSolutions\CypherDSL\Clauses\Clause;
@@ -56,7 +57,6 @@
 use WikibaseSolutions\CypherDSL\Types\StructuralTypes\NodeType;
 use WikibaseSolutions\CypherDSL\Types\StructuralTypes\PathType;
 use WikibaseSolutions\CypherDSL\Types\StructuralTypes\StructuralType;
-use function call_user_func;
 
 /**
  * Builder class for building complex Cypher queries.
@@ -648,8 +648,6 @@ public function callProcedure(string $procedure, array $arguments = [], array $y
      */
     public function call($decorator): self
     {
-        self::assertClass('decorator', 'callable', $decorator);
-
         $subQuery = self::new();
 
         $decorator($subQuery);

tests/Unit/QueryTest.php

@@ -1048,6 +1048,20 @@ public function testAutomaticIdentifierGeneration(): void
         $this->assertInstanceOf(Variable::class, $node->getName());
     }
 
+    public function testCall(): void
+    {
+        $node = Query::node('X')->named('y');
+        $query = Query::new()->match($node)
+            ->call(function (Query $subQuery) use ($node) {
+                $subQuery->with($node->getVariable())
+                    ->where($node->property('z')->equals(Query::literal('foo'), false))
+                    ->returning($node->property('z')->alias('foo'));
+            })
+            ->returning(Query::variable('foo'));
+
+        $this->assertEquals("MATCH (y:X) CALL { WITH y WHERE y.z = 'foo' RETURN y.z AS foo } RETURN foo", $query->toQuery());
+    }
+
     public function provideLiteralData(): array
     {
         return [