Auto tests: add PlatformClipboard::isAvailable()

Change-Id: Ie04060c2cae61ff8268644e9cd8001a1f5745f31
Reviewed-by: Caroline Chao <caroline.chao@digia.com>

tests/auto/shared/platformclipboard.h

@@ -0,0 +1,69 @@
+/****************************************************************************
+**
+** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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 Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef PLATFORMCLIPBOARD_H
+#define PLATFORMCLIPBOARD_H
+
+#include <qglobal.h>
+
+#ifdef Q_OS_MAC
+#include <Carbon/Carbon.h>
+#endif
+
+struct PlatformClipboard
+{
+    static inline bool isAvailable()
+    {
+#if defined(QT_NO_CLIPBOARD)
+        return false;
+#elif defined(Q_OS_MAC)
+        PasteboardRef pasteboard;
+        OSStatus status = PasteboardCreate(0, &pasteboard);
+        if (status == noErr)
+            CFRelease(pasteboard);
+        return status == noErr;
+#else
+        return true;
+#endif
+    }
+};
+
+#endif // PLATFORMCLIPBOARD_H