From 8203f860d1ba2c61de28dbae5f34db6601e02214 Mon Sep 17 00:00:00 2001
From: Ulf Hermann <ulf.hermann@qt.io>
Date: Tue, 30 Sep 2025 08:11:48 +0200
Subject: QtQml: Add test for writing to delayed properties

This proves that commit a7349e6433d092398d76cafa5408753f06892cd7 fixes
QTBUG-139687.

Pick-to: 6.10 6.8
Fixes: QTBUG-139687
Change-Id: I2730b545738bf75e381b0b396b74c5060fa9b0e1
Reviewed-by: Sami Shalayel <sami.shalayel@qt.io>
---
 tests/auto/qml/qmlcppcodegen/tst_qmlcppcodegen.cpp | 84 +++++++++++++++++++++-
 1 file changed, 83 insertions(+), 1 deletion(-)

(limited to 'tests/auto/qml/qmlcppcodegen/tst_qmlcppcodegen.cpp')

diff --git a/tests/auto/qml/qmlcppcodegen/tst_qmlcppcodegen.cpp b/tests/auto/qml/qmlcppcodegen/tst_qmlcppcodegen.cpp
index 43b6e99f73..884372bfa4 100644
--- a/tests/auto/qml/qmlcppcodegen/tst_qmlcppcodegen.cpp
+++ b/tests/auto/qml/qmlcppcodegen/tst_qmlcppcodegen.cpp
@@ -11,6 +11,7 @@
 #include <data/listprovider.h>
 #include <data/objectwithmethod.h>
 #include <data/qmlusing.h>
+#include <data/refuseWrite.h>
 #include <data/resettable.h>
 #include <data/sequenceToIterable.h>
 #include <data/takenumber.h>
@@ -234,9 +235,10 @@ private slots:
     void propertyOfParent();
     void qmlUsing();
     void qtfont();
-    void reduceWithNullThis();
     void readEnumFromInstance();
     void readonlyListProperty();
+    void reduceWithNullThis();
+    void refuseWrite();
     void registerElimination();
     void registerPropagation();
     void renameAdjust();
@@ -4991,6 +4993,86 @@ void tst_QmlCppCodegen::reduceWithNullThis()
     QCOMPARE(object->property("preferredHeight2").toDouble(), 28.0);
 }
 
+void tst_QmlCppCodegen::refuseWrite()
+{
+    QQmlEngine engine;
+    QQmlComponent component(&engine, QUrl(u"qrc:/qt/qml/TestTypes/writeBackReferenceObject.qml"_s));
+    QVERIFY2(component.isReady(), qPrintable(component.errorString()));
+    QScopedPointer<QObject> object(component.create());
+    QVERIFY(!object.isNull());
+
+    QObject *a = object->property("a").value<QObject*>();
+    QVERIFY(a);
+    QVERIFY(a->property("things").value<QVariantList>().isEmpty());
+
+    RefuseWrite *refuse = qobject_cast<RefuseWrite *>(object.data());
+    QVERIFY(refuse->things().isEmpty());
+    QCOMPARE(refuse->pendingChanges(), 0);
+
+    QMetaObject::invokeMethod(object.data(), "idToId");
+
+    QTRY_COMPARE(refuse->pendingChanges(), 0);
+    QCOMPARE(refuse->things(), QVariantList({QVariant(), QVariant::fromValue<double>(42.25)}));
+    QVERIFY(a->property("things").value<QVariantList>().isEmpty());
+
+    QMetaObject::invokeMethod(object.data(), "scopeToScope");
+
+    QTRY_COMPARE(refuse->pendingChanges(), 0);
+    QCOMPARE(refuse->things(), QVariantList({
+        QVariant::fromValue<double>(0.5),
+        QVariant::fromValue<double>(42.25)
+    }));
+    QVERIFY(a->property("things").value<QVariantList>().isEmpty());
+
+    QMetaObject::invokeMethod(object.data(), "idToScope");
+
+    QTRY_COMPARE(refuse->pendingChanges(), 0);
+    QCOMPARE(refuse->things(), QVariantList({
+        QVariant::fromValue<double>(0.5),
+        QVariant::fromValue<double>(42.25),
+        QVariant::fromValue<double>(3),
+    }));
+    QVERIFY(a->property("things").value<QVariantList>().isEmpty());
+
+    QMetaObject::invokeMethod(object.data(), "scopeToId");
+
+    QTRY_COMPARE(refuse->pendingChanges(), 0);
+    QCOMPARE(refuse->things(), QVariantList({
+        QVariant::fromValue<double>(0.5),
+        QVariant::fromValue<double>(42.25),
+        QVariant::fromValue<double>(3),
+        QVariant::fromValue<double>(4),
+    }));
+    QVERIFY(a->property("things").value<QVariantList>().isEmpty());
+
+    QMetaObject::invokeMethod(object.data(), "scopeToUnrelated");
+
+    QTRY_COMPARE(refuse->pendingChanges(), 0);
+    const QVariantList expected5 = QVariantList({
+        QVariant::fromValue<double>(0.5),
+        QVariant::fromValue<double>(42.25),
+        QVariant::fromValue<double>(3),
+        QVariant::fromValue<double>(4),
+        QVariant::fromValue<double>(5),
+    });
+    QCOMPARE(refuse->things(), expected5);
+    QCOMPARE(a->property("things").value<QVariantList>(), expected5);
+
+    QMetaObject::invokeMethod(object.data(), "idToUnrelated");
+
+    QTRY_COMPARE(refuse->pendingChanges(), 0);
+    const QVariantList expected6 = QVariantList({
+        QVariant::fromValue<double>(0.5),
+        QVariant::fromValue<double>(42.25),
+        QVariant::fromValue<double>(3),
+        QVariant::fromValue<double>(4),
+        QVariant::fromValue<double>(5),
+        QVariant::fromValue<double>(6),
+    });
+    QCOMPARE(refuse->things(), expected6);
+    QCOMPARE(a->property("things").value<QVariantList>(), expected6);
+}
+
 void tst_QmlCppCodegen::readEnumFromInstance()
 {
     QQmlEngine engine;
-- 
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