Add auto-test for qmlcachegen

This test writes a simple QML file with embedded JS code into a
temporary directory, calls qmlcachegen to generate the cache file,
removes the original source code and tries to load the component.

Change-Id: I63e1b0c76a987f4a21b3dc6cb7c4dc828dd5d11f
Reviewed-by: Lars Knoll <lars.knoll@qt.io>

3 files changed, 129 insertions, 0 deletions

diff --git a/tests/auto/qml/qml.pro b/tests/auto/qml/qml.pro
index 007eb0dc83..ac288674c7 100644
--- a/tests/auto/qml/qml.pro
+++ b/tests/auto/qml/qml.pro
@@ -39,6 +39,7 @@ PRIVATETESTS += \
 
 !boot2qt {
 PRIVATETESTS += \
+    qmlcachegen \
     animation \
     qqmlecmascript \
     qqmlcontext \
diff --git a/tests/auto/qml/qmlcachegen/qmlcachegen.pro b/tests/auto/qml/qmlcachegen/qmlcachegen.pro
new file mode 100644
index 0000000000..8d8b37be15
--- /dev/null
+++ b/tests/auto/qml/qmlcachegen/qmlcachegen.pro
@@ -0,0 +1,7 @@
+CONFIG += testcase
+TARGET = tst_qmlcachegen
+macos:CONFIG -= app_bundle
+
+SOURCES += tst_qmlcachegen.cpp
+
+QT += core-private qml-private testlib
diff --git a/tests/auto/qml/qmlcachegen/tst_qmlcachegen.cpp b/tests/auto/qml/qmlcachegen/tst_qmlcachegen.cpp
new file mode 100644
index 0000000000..466d63bf80
--- /dev/null
+++ b/tests/auto/qml/qmlcachegen/tst_qmlcachegen.cpp
@@ -0,0 +1,121 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 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 <qtest.h>
+
+#include <QQmlComponent>
+#include <QQmlEngine>
+#include <QProcess>
+#include <QLibraryInfo>
+#include <QSysInfo>
+
+class tst_qmlcachegen: public QObject
+{
+    Q_OBJECT
+
+private slots:
+    void initTestCase();
+
+    void loadGeneratedFile();
+};
+
+// A wrapper around QQmlComponent to ensure the temporary reference counts
+// on the type data as a result of the main thread <> loader thread communication
+// are dropped. Regular Synchronous loading will leave us with an event posted
+// to the gui thread and an extra refcount that will only be dropped after the
+// event delivery. A plain sendPostedEvents() however is insufficient because
+// we can't be sure that the event is posted after the constructor finished.
+class CleanlyLoadingComponent : public QQmlComponent
+{
+public:
+    CleanlyLoadingComponent(QQmlEngine *engine, const QUrl &url)
+        : QQmlComponent(engine, url, QQmlComponent::Asynchronous)
+    { waitForLoad(); }
+    CleanlyLoadingComponent(QQmlEngine *engine, const QString &fileName)
+        : QQmlComponent(engine, fileName, QQmlComponent::Asynchronous)
+    { waitForLoad(); }
+
+    void waitForLoad()
+    {
+        QTRY_VERIFY(status() == QQmlComponent::Ready || status() == QQmlComponent::Error);
+    }
+};
+
+static bool generateCache(const QString &qmlFileName)
+{
+    QProcess proc;
+    proc.setProcessChannelMode(QProcess::ForwardedChannels);
+    proc.setProgram(QLibraryInfo::location(QLibraryInfo::BinariesPath) + QDir::separator() + QLatin1String("qmlcachegen"));
+    proc.setArguments(QStringList() << (QLatin1String("--target-architecture=") + QSysInfo::buildCpuArchitecture()) << qmlFileName);
+    proc.start();
+    if (!proc.waitForFinished())
+        return false;
+    if (proc.exitStatus() != QProcess::NormalExit)
+        return false;
+    return proc.exitCode() == 0;
+}
+
+void tst_qmlcachegen::initTestCase()
+{
+    qputenv("QML_FORCE_DISK_CACHE", "1");
+}
+
+void tst_qmlcachegen::loadGeneratedFile()
+{
+    QTemporaryDir tempDir;
+    QVERIFY(tempDir.isValid());
+
+    const auto writeTempFile = [&tempDir](const QString &fileName, const char *contents) {
+        QFile f(tempDir.path() + '/' + fileName);
+        const bool ok = f.open(QIODevice::WriteOnly | QIODevice::Truncate);
+        Q_ASSERT(ok);
+        f.write(contents);
+        return f.fileName();
+    };
+
+    const QString testFilePath = writeTempFile("test.qml", "import QtQml 2.0\n"
+                                                           "QtObject {\n"
+                                                           "    property int value: Math.min(100, 42);\n"
+                                                           "}");
+
+    QVERIFY(generateCache(testFilePath));
+
+    const QString cacheFilePath = testFilePath + QLatin1Char('c');
+    QVERIFY(QFile::exists(cacheFilePath));
+    QVERIFY(QFile::remove(testFilePath));
+
+    QQmlEngine engine;
+    CleanlyLoadingComponent component(&engine, QUrl::fromLocalFile(testFilePath));
+    QScopedPointer<QObject> obj(component.create());
+    QVERIFY(!obj.isNull());
+    QCOMPARE(obj->property("value").toInt(), 42);
+}
+
+QTEST_GUILESS_MAIN(tst_qmlcachegen)
+
+#include "tst_qmlcachegen.moc"