3 files changed, 29 insertions, 3 deletions
diff --git a/tests/auto/qml/qqmllanguage/data/foreignExtended.qml b/tests/auto/qml/qqmllanguage/data/foreignExtended.qml
index 4863e0d567..b01af6d229 100644
--- a/tests/auto/qml/qqmllanguage/data/foreignExtended.qml
+++ b/tests/auto/qml/qqmllanguage/data/foreignExtended.qml
@@ -5,12 +5,17 @@ QtObject {
     property Foreign foreign: Foreign {
         objectName: "foreign"
     }
-    property Extended extended: Extended {}
+    property Extended extended: Extended {
+        objectName: "extended"
+        property int changeCount: 0
+        onExtensionChanged: ++changeCount
+    }
     property ForeignExtended foreignExtended: ForeignExtended {
         objectName: "foreignExtended"
     }
 
     property int extendedBase: extended.base
+    property int extendedChangeCount: extended.changeCount
 
     property int extendedInvokable: extended.invokable()
     property int extendedSlot: extended.slot()
diff --git a/tests/auto/qml/qqmllanguage/testtypes.h b/tests/auto/qml/qqmllanguage/testtypes.h
index 06554ef87a..cfc0ad6e71 100644
--- a/tests/auto/qml/qqmllanguage/testtypes.h
+++ b/tests/auto/qml/qqmllanguage/testtypes.h
@@ -1470,13 +1470,23 @@ public:
 class Extension : public QObject
 {
     Q_OBJECT
-    Q_PROPERTY(int extension READ extension CONSTANT)
+    Q_PROPERTY(int extension READ extension WRITE setExtension NOTIFY extensionChanged FINAL)
 public:
     Extension(QObject *parent = nullptr) : QObject(parent) {}
-    int extension() const { return 42; }
+    int extension() const { return ext; }
+    void setExtension(int e) {
+        if (e != ext) {
+            ext = e;
+            emit extensionChanged();
+        }
+    }
     Q_INVOKABLE int invokable() { return 123; }
+Q_SIGNALS:
+    void extensionChanged();
 public slots:
     int slot() { return 456; }
+private:
+    int ext = 42;
 };
 
 class Extended : public QObject
diff --git a/tests/auto/qml/qqmllanguage/tst_qqmllanguage.cpp b/tests/auto/qml/qqmllanguage/tst_qqmllanguage.cpp
index 7e30dcad6c..263b44ae22 100644
--- a/tests/auto/qml/qqmllanguage/tst_qqmllanguage.cpp
+++ b/tests/auto/qml/qqmllanguage/tst_qqmllanguage.cpp
@@ -5634,9 +5634,20 @@ void tst_qqmllanguage::extendedForeignTypes()
     QScopedPointer<QObject> o(component.create());
     QVERIFY(!o.isNull());
 
+    QObject *extended = o->property("extended").value<QObject *>();
+    QVERIFY(extended);
+    QSignalSpy extensionChangedSpy(extended, SIGNAL(extensionChanged()));
+
     QCOMPARE(o->property("extendedBase").toInt(), 43);
     QCOMPARE(o->property("extendedExtension").toInt(), 42);
     QCOMPARE(o->property("foreignExtendedExtension").toInt(), 42);
+
+    QCOMPARE(extensionChangedSpy.count(), 0);
+    extended->setProperty("extension", 44);
+    QCOMPARE(extensionChangedSpy.count(), 1);
+    QCOMPARE(o->property("extendedChangeCount").toInt(), 1);
+    QCOMPARE(o->property("extendedExtension").toInt(), 44);
+
     QCOMPARE(o->property("foreignObjectName").toString(), QLatin1String("foreign"));
     QCOMPARE(o->property("foreignExtendedObjectName").toString(), QLatin1String("foreignExtended"));
     QCOMPARE(o->property("extendedInvokable").toInt(), 123);