diff --git a/tests/default/data/pdo-mysql.php b/tests/default/data/pdo-mysql.php
index 7f5b61e65..507f58282 100644
--- a/tests/default/data/pdo-mysql.php
+++ b/tests/default/data/pdo-mysql.php
@@ -27,4 +27,21 @@ public function aggregateFunctions(PDO $pdo)
         $stmt = $pdo->query($query, PDO::FETCH_ASSOC);
         assertType('PDOStatement<array{MAX(adaid): int<-32768, 32767>|null, MIN(adaid): int<-32768, 32767>|null, COUNT(adaid): int, AVG(adaid): float|null}>', $stmt);
     }
+
+    public function placeholderInData(PDO $pdo)
+    {
+        // double quotes within the query
+        $query = 'SELECT adaid FROM ada WHERE email LIKE ":gesperrt%"';
+        $stmt = $pdo->prepare($query);
+        assertType('PDOStatement<array{adaid: int<-32768, 32767>, 0: int<-32768, 32767>}>', $stmt);
+        $stmt->execute();
+        assertType('PDOStatement<array{adaid: int<-32768, 32767>, 0: int<-32768, 32767>}>', $stmt);
+
+        // single quotes within the query
+        $query = "SELECT adaid FROM ada WHERE email LIKE ':gesperrt%'";
+        $stmt = $pdo->prepare($query);
+        assertType('PDOStatement<array{adaid: int<-32768, 32767>, 0: int<-32768, 32767>}>', $stmt);
+        $stmt->execute();
+        assertType('PDOStatement<array{adaid: int<-32768, 32767>, 0: int<-32768, 32767>}>', $stmt);
+    }
 }
diff --git a/tests/default/data/pdo-prepare.php b/tests/default/data/pdo-prepare.php
index dfb773d39..988aef832 100644
--- a/tests/default/data/pdo-prepare.php
+++ b/tests/default/data/pdo-prepare.php
@@ -60,18 +60,6 @@ public function placeholderInData(PDO $pdo)
         assertType('PDOStatement<array{adaid: int<-32768, 32767>, 0: int<-32768, 32767>}>', $stmt);
         $stmt->execute();
         assertType('PDOStatement<array{adaid: int<-32768, 32767>, 0: int<-32768, 32767>}>', $stmt);
-
-        $query = 'SELECT adaid FROM ada WHERE email LIKE ":gesperrt%"';
-        $stmt = $pdo->prepare($query);
-        assertType('PDOStatement<array{adaid: int<-32768, 32767>, 0: int<-32768, 32767>}>', $stmt);
-        $stmt->execute();
-        assertType('PDOStatement<array{adaid: int<-32768, 32767>, 0: int<-32768, 32767>}>', $stmt);
-
-        $query = "SELECT adaid FROM ada WHERE email LIKE ':gesperrt%'";
-        $stmt = $pdo->prepare($query);
-        assertType('PDOStatement<array{adaid: int<-32768, 32767>, 0: int<-32768, 32767>}>', $stmt);
-        $stmt->execute();
-        assertType('PDOStatement<array{adaid: int<-32768, 32767>, 0: int<-32768, 32767>}>', $stmt);
     }
 
     public function arrayParam(PDO $pdo)