Fix caching of QML singleton types

When a QML file depends on a QML singleton, we failed to include it in
the dependency hash. Thus changes to the QML singleton did not result in
a re-creation of the caches of files that use it.

The list of singletons comes from random-ordered hashes in the qml
import handling. We provide an order to the direct dependencies by
sorting by the singleton type names.

Task-number: QTBUG-58486
Change-Id: Ie7e9d006f9bf3a60af1f819ee439c29bc234bd8a
Reviewed-by: Lars Knoll <lars.knoll@qt.io>

1 files changed, 53 insertions, 0 deletions

diff --git a/tests/auto/qml/qmldiskcache/tst_qmldiskcache.cpp b/tests/auto/qml/qmldiskcache/tst_qmldiskcache.cpp
index b265607fd1..9494e3a7fd 100644
--- a/tests/auto/qml/qmldiskcache/tst_qmldiskcache.cpp
+++ b/tests/auto/qml/qmldiskcache/tst_qmldiskcache.cpp
@@ -58,6 +58,7 @@ private slots:
     void localAliases();
     void cacheResources();
     void stableOrderOfDependentCompositeTypes();
+    void singletonDependency();
 };
 
 // A wrapper around QQmlComponent to ensure the temporary reference counts
@@ -737,6 +738,58 @@ void tst_qmldiskcache::stableOrderOfDependentCompositeTypes()
     }
 }
 
+void tst_qmldiskcache::singletonDependency()
+{
+    QScopedPointer<QQmlEngine> engine(new QQmlEngine);
+
+    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();
+    };
+
+    writeTempFile("MySingleton.qml", "import QtQml 2.0\npragma Singleton\nQtObject { property int value: 42 }");
+    writeTempFile("qmldir", "singleton MySingleton 1.0 MySingleton.qml");
+    const QString testFilePath = writeTempFile("main.qml", "import QtQml 2.0\nimport \".\"\nQtObject {\n"
+                                                           "    property int value: MySingleton.value\n"
+                                                           "}");
+
+    {
+        CleanlyLoadingComponent component(engine.data(), QUrl::fromLocalFile(testFilePath));
+        QScopedPointer<QObject> obj(component.create());
+        QVERIFY(!obj.isNull());
+        QCOMPARE(obj->property("value").toInt(), 42);
+    }
+
+    const QString testFileCachePath = testFilePath + QLatin1Char('c');
+    QVERIFY(QFile::exists(testFileCachePath));
+    QDateTime initialCacheTimeStamp = QFileInfo(testFileCachePath).lastModified();
+
+    engine.reset(new QQmlEngine);
+    waitForFileSystem();
+
+    writeTempFile("MySingleton.qml", "import QtQml 2.0\npragma Singleton\nQtObject { property int value: 100 }");
+    waitForFileSystem();
+
+    {
+        CleanlyLoadingComponent component(engine.data(), QUrl::fromLocalFile(testFilePath));
+        QScopedPointer<QObject> obj(component.create());
+        QVERIFY(!obj.isNull());
+        QCOMPARE(obj->property("value").toInt(), 100);
+    }
+
+    {
+        QVERIFY(QFile::exists(testFileCachePath));
+        QDateTime newCacheTimeStamp = QFileInfo(testFileCachePath).lastModified();
+        QVERIFY2(newCacheTimeStamp > initialCacheTimeStamp, qPrintable(newCacheTimeStamp.toString()));
+    }
+}
+
 QTEST_MAIN(tst_qmldiskcache)
 
 #include "tst_qmldiskcache.moc"