Increase test coverage for the V4 memory manager

This commit adds a small test that exercises a number of code paths
inside qv4mm.cpp which are normally gated via environment variables.

Change-Id: Ibe959387a9b86ce68df258513446d2165fe06ee2
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

2 files changed, 66 insertions, 0 deletions

diff --git a/tests/auto/qml/qv4mm/qv4mm.pro b/tests/auto/qml/qv4mm/qv4mm.pro
new file mode 100644
index 0000000000..d9b749af4a
--- /dev/null
+++ b/tests/auto/qml/qv4mm/qv4mm.pro
@@ -0,0 +1,8 @@
+CONFIG += testcase
+TARGET = tst_qv4mm
+osx:CONFIG -= app_bundle
+
+SOURCES += tst_qv4mm.cpp
+
+QT += qml qml-private testlib
+
diff --git a/tests/auto/qml/qv4mm/tst_qv4mm.cpp b/tests/auto/qml/qv4mm/tst_qv4mm.cpp
new file mode 100644
index 0000000000..d4ba363d00
--- /dev/null
+++ b/tests/auto/qml/qv4mm/tst_qv4mm.cpp
@@ -0,0 +1,58 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 basysKom GmbH.
+** 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 <qtest.h>
+#include <QQmlEngine>
+#include <private/qv4mm_p.h>
+
+class tst_qv4mm : public QObject
+{
+    Q_OBJECT
+
+private slots:
+    void gcStats();
+    void tweaks();
+};
+
+void tst_qv4mm::gcStats()
+{
+    qputenv(QV4_MM_STATS, "1");
+    QQmlEngine engine;
+    engine.collectGarbage();
+}
+
+void tst_qv4mm::tweaks()
+{
+    qputenv(QV4_MM_MAXBLOCK_SHIFT, "5");
+    qputenv(QV4_MM_MAX_CHUNK_SIZE, "65536");
+    QQmlEngine engine;
+}
+
+QTEST_MAIN(tst_qv4mm)
+
+#include "tst_qv4mm.moc"