Add a test for QLocalSocket::open

This should have been done in the commit that introduced open
(953255abab), but was missing.

Change-Id: I1c2de4ad5fa42aa5b90646e7d4d7d1b1570a0f87
Reviewed-by: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>

tests/auto/network/socket/qlocalsocket/tst_qlocalsocket.cpp

@@ -78,6 +78,8 @@ private slots:
     void listenAndConnect_data();
     void listenAndConnect();
 
+    void connectWithOpen();
+
     void sendData_data();
     void sendData();
 
@@ -452,6 +454,27 @@ void tst_QLocalSocket::listenAndConnect()
     QCOMPARE(spyNewConnection.count(), (canListen ? connections : 0));
 }
 
+void tst_QLocalSocket::connectWithOpen()
+{
+    LocalServer server;
+    QVERIFY(server.listen("tst_qlocalsocket"));
+
+    LocalSocket socket;
+    socket.setServerName("tst_qlocalsocket");
+    QVERIFY(socket.open());
+
+    bool timedOut = true;
+    QVERIFY(server.waitForNewConnection(3000, &timedOut));
+
+#if defined(QT_LOCALSOCKET_TCP)
+    QTest::qWait(250);
+#endif
+    QVERIFY(!timedOut);
+
+    socket.close();
+    server.close();
+}
+
 void tst_QLocalSocket::sendData_data()
 {
     listenAndConnect_data();