QML: Allow singleton types to be extended

It seems we never stated that singletons can not be extended in our
documentation. Therefore this is technically a bug fix and doesn't need
separate documentation.

Change-Id: I7877289bd5a52ecf709f80ba1975137981ec65f0
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>

1 files changed, 23 insertions, 0 deletions

diff --git a/tests/auto/qml/qqmllanguage/tst_qqmllanguage.cpp b/tests/auto/qml/qqmllanguage/tst_qqmllanguage.cpp
index 40a2ee887a..9a9f13ee0a 100644
--- a/tests/auto/qml/qqmllanguage/tst_qqmllanguage.cpp
+++ b/tests/auto/qml/qqmllanguage/tst_qqmllanguage.cpp
@@ -342,6 +342,7 @@ private slots:
     void registerValueTypes();
     void extendedNamespace();
     void factorySingleton();
+    void extendedSingleton();
 
 private:
     QQmlEngine engine;
@@ -6065,6 +6066,28 @@ void tst_qqmllanguage::factorySingleton()
     QCOMPARE(obj->property("mine").toInt(), 314);
 }
 
+void tst_qqmllanguage::extendedSingleton()
+{
+    QQmlEngine engine;
+    QQmlComponent c(&engine);
+    c.setData("import StaticTest\n"
+              "import QtQml\n"
+              "QtObject {\n"
+              "    property int a: ExtendedSingleton.foo\n"
+              "    property int b: NamespaceExtendedSingleton.foo\n"
+              "    property int c: ExtendedSingleton.extension\n"
+              "    property int d: NamespaceExtendedSingleton.Bar\n"
+              "}", QUrl());
+    QVERIFY2(c.isReady(), qPrintable(c.errorString()));
+    QScopedPointer<QObject> obj(c.create());
+    QVERIFY(!obj.isNull());
+
+    QCOMPARE(obj->property("a").toInt(), 315);
+    QCOMPARE(obj->property("b").toInt(), 316);
+    QCOMPARE(obj->property("c").toInt(), 42);
+    QCOMPARE(obj->property("d").toInt(), 9);
+}
+
 QTEST_MAIN(tst_qqmllanguage)
 
 #include "tst_qqmllanguage.moc"