Test what happens when wl_display_connect fails

A failed wl_display_connect should make the platform plugin fail gracefully.
Add a test for it to make sure.

Change-Id: I87a3d9ee151fcdb1bc6ad9ffba44ad5014ede005
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: Pier Luigi Fiorini <pierluigi.fiorini@liri.io>

3 files changed, 65 insertions, 1 deletions

diff --git a/tests/auto/client/client.pro b/tests/auto/client/client.pro
index d19326797..a668d37d5 100644
--- a/tests/auto/client/client.pro
+++ b/tests/auto/client/client.pro
@@ -2,4 +2,5 @@ TEMPLATE=subdirs
 
 SUBDIRS += \
     client \
-    xdgshellv6
+    xdgshellv6 \
+    wl_connect
diff --git a/tests/auto/client/wl_connect/tst_wlconnect.cpp b/tests/auto/client/wl_connect/tst_wlconnect.cpp
new file mode 100644
index 000000000..661f7ad62
--- /dev/null
+++ b/tests/auto/client/wl_connect/tst_wlconnect.cpp
@@ -0,0 +1,58 @@
+/****************************************************************************
+**
+** Copyright (C) 2018 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:GPL-EXCEPT$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtTest/QtTest>
+#include <QGuiApplication>
+#include <qpa/qplatformintegrationfactory_p.h>
+
+class tst_WlConnect : public QObject
+{
+    Q_OBJECT
+private slots:
+    void failsGracefully()
+    {
+        // This tests whether the Wayland platform integration will fail gracefully when it's
+        // unable to connect to a compositor
+
+        // Make sure the connection actually fails
+        setenv("XDG_RUNTIME_DIR", "/dev/null", 1); // a place where there are no Wayland sockets
+        setenv("WAYLAND_DISPLAY", "qt_invalid_socket", 1); // just to be sure
+
+        QStringList arguments;
+        QString platformPluginPath;
+        int argc = 0;
+        char **argv = nullptr; //It's not currently used by the wayland plugin
+        auto *platformIntegration = QPlatformIntegrationFactory::create("wayland", arguments, argc, argv, platformPluginPath);
+
+        // The factory method should return nullptr to signify it failed gracefully
+        Q_ASSERT(!platformIntegration);
+    }
+};
+
+QTEST_APPLESS_MAIN(tst_WlConnect)
+#include <tst_wlconnect.moc>
diff --git a/tests/auto/client/wl_connect/wl_connect.pro b/tests/auto/client/wl_connect/wl_connect.pro
new file mode 100644
index 000000000..28723beee
--- /dev/null
+++ b/tests/auto/client/wl_connect/wl_connect.pro
@@ -0,0 +1,5 @@
+CONFIG += testcase
+QT += gui-private testlib
+
+SOURCES += tst_wlconnect.cpp
+TARGET = tst_wlconnect