diff --git a/tests/dibi/Connection.connect.phpt b/tests/dibi/Connection.connect.phpt
index d0ac395c..2582558e 100644
--- a/tests/dibi/Connection.connect.phpt
+++ b/tests/dibi/Connection.connect.phpt
@@ -52,6 +52,17 @@ test(function () use ($config) {
 });
 
 
+test(function () use ($config) {
+	$conn = new Connection($config);
+	Assert::equal('hello', $conn->query('SELECT %s', 'hello')->fetchSingle());
+
+	$conn->disconnect();
+
+	$conn->connect();
+	Assert::equal('hello', $conn->query('SELECT %s', 'hello')->fetchSingle());
+});
+
+
 test(function () use ($config) {
 	Assert::exception(function () use ($config) {
 		new Connection($config + ['onConnect' => '']);