Fix nullptr handling in binding

Fixes: QTBUG-77027
Change-Id: I61d5a20329ffe95af810b89e338eee2bc10bfe04
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

1 files changed, 17 insertions, 0 deletions

diff --git a/tests/auto/qml/qqmlproperty/tst_qqmlproperty.cpp b/tests/auto/qml/qqmlproperty/tst_qqmlproperty.cpp
index 04c61ec11b..67da768f73 100644
--- a/tests/auto/qml/qqmlproperty/tst_qqmlproperty.cpp
+++ b/tests/auto/qml/qqmlproperty/tst_qqmlproperty.cpp
@@ -144,6 +144,7 @@ private slots:
     void deeplyNestedObject();
     void readOnlyDynamicProperties();
     void aliasToIdWithMatchingQmlFileNameOnCaseInsensitiveFileSystem();
+    void nullPropertyBinding();
 
     void floatToStringPrecision_data();
     void floatToStringPrecision();
@@ -2059,6 +2060,22 @@ void tst_qqmlproperty::aliasToIdWithMatchingQmlFileNameOnCaseInsensitiveFileSyst
     QVERIFY(property.isValid());
 }
 
+// QTBUG-77027
+void tst_qqmlproperty::nullPropertyBinding()
+{
+    const QUrl url = testFileUrl("nullPropertyBinding.qml");
+    QQmlEngine engine;
+    QQmlComponent component(&engine, url);
+    QScopedPointer<QObject> root(component.create());
+    QVERIFY(root);
+    QTest::ignoreMessage(QtMsgType::QtInfoMsg, "undefined");
+    QMetaObject::invokeMethod(root.get(), "tog");
+    QTest::ignoreMessage(QtMsgType::QtInfoMsg, "defined");
+    QMetaObject::invokeMethod(root.get(), "tog");
+    QTest::ignoreMessage(QtMsgType::QtInfoMsg, "undefined");
+    QMetaObject::invokeMethod(root.get(), "tog");
+}
+
 void tst_qqmlproperty::floatToStringPrecision_data()
 {
     QTest::addColumn<QString>("propertyName");