UnitTests: Add utility functions for test

Having a global temporaryDirPath makes changes much easier.

Change-Id: Iec92bba7b7eca5b0e893ebee9f457734deba8cc8
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

tests/unit/unittest/unittest-utility-functions.h

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+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt Creator.
+**
+** 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.
+**
+****************************************************************************/
+
+#pragma once
+
+#include <utils/smallstring.h>
+
+#include <QDir>
+
+namespace UnitTest {
+
+inline
+Utils::PathString temporaryDirPath()
+{
+    return Utils::PathString::fromQString(QDir::tempPath());
+}
+} // namespace UnitTest