diff --git a/tests/data/pdo.php b/tests/data/pdo.php
index 18beda70f..a1b5e71b3 100644
--- a/tests/data/pdo.php
+++ b/tests/data/pdo.php
@@ -105,6 +105,20 @@ public function replaceQuery(PDO $pdo)
         assertType('PDOStatement', $stmt);
     }
 
+    public function queryBranches(PDO $pdo, bool $bool, int $adaid)
+    {
+        $query = 'SELECT email, adaid FROM ada';
+        $stmt = $pdo->query($query, PDO::FETCH_NUM);
+        assertType('PDOStatement<array{string, int<0, 4294967295>}>', $stmt);
+
+        if ($bool) {
+            $query .= ' WHERE adaid='.$adaid;
+        }
+
+        $stmt = $pdo->query($query, PDO::FETCH_NUM);
+        assertType('PDOStatement<array{string, int<0, 4294967295>}>', $stmt);
+    }
+
     public function updateQuery(PDO $pdo)
     {
         $query = "UPDATE ada SET email='test@complex-it.de' where adaid=-5";