Fix QJSValue string parameters used in signals

Fixes: QTBUG-86482
Change-Id: If938fad22f51b08fe3cb20b94634efe46a1eed47
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>
(cherry picked from commit e887f25dd6c4c9630a7367c3a2ed95a284191843)

2 files changed, 125 insertions, 0 deletions

diff --git a/tests/auto/qml/qqmllanguage/testtypes.h b/tests/auto/qml/qqmllanguage/testtypes.h
index 003e9d06ad..8f4071d9b8 100644
--- a/tests/auto/qml/qqmllanguage/testtypes.h
+++ b/tests/auto/qml/qqmllanguage/testtypes.h
@@ -1607,6 +1607,110 @@ public:
     int foo() const { return 316; }
 };
 
+class ForeignSingleton : public QObject {
+    Q_OBJECT
+    Q_PROPERTY(int number READ number WRITE setnumber NOTIFY numberchanged)
+public:
+    ForeignSingleton(QObject *parent = nullptr) : QObject(parent) {};
+    int number() { return m_number; }
+    void setnumber(int number) { m_number = number; }
+    static ForeignSingleton *obtain() { return new ForeignSingleton; }
+signals:
+    void numberchanged();
+private:
+    int m_number = 0;
+};
+
+class WrapperSingleton : public QObject {
+    Q_OBJECT
+    QML_NAMED_ELEMENT(ForeignSingleton)
+    QML_FOREIGN(ForeignSingleton)
+    QML_SINGLETON
+
+public:
+    static ForeignSingleton* create(QQmlEngine *, QJSEngine *) {
+        ForeignSingleton *singleton = ForeignSingleton::obtain();
+        singleton->setnumber(42);
+        return singleton;
+    }
+
+private:
+    WrapperSingleton() = default;
+};
+
+class ExtensionA : public QObject
+{
+    Q_OBJECT
+    QML_ANONYMOUS
+    Q_PROPERTY(int a READ a CONSTANT)
+    Q_PROPERTY(int c READ c CONSTANT)
+    Q_PROPERTY(int d READ d CONSTANT)
+    Q_PROPERTY(int f READ f CONSTANT)
+    Q_PROPERTY(int g READ g CONSTANT)
+public:
+    ExtensionA(QObject *parent = nullptr) : QObject(parent) {}
+    int a() const { return 'a'; }
+    int c() const { return 11; }
+    int d() const { return 21; }
+    int f() const { return 31; }
+    int g() const { return 41; }
+};
+
+class ExtensionB : public QObject
+{
+    Q_OBJECT
+    QML_ANONYMOUS
+    Q_PROPERTY(int b READ b CONSTANT)
+    Q_PROPERTY(int c READ c CONSTANT)
+    Q_PROPERTY(int d READ d CONSTANT)
+public:
+    ExtensionB(QObject *parent = nullptr) : QObject(parent) {}
+    int b() const { return 'b'; }
+    int c() const { return 12; }
+    int d() const { return 22; }
+};
+
+class MultiExtensionParent : public QObject
+{
+    Q_OBJECT
+    QML_ANONYMOUS
+    QML_EXTENDED(ExtensionA)
+    Q_PROPERTY(int p READ p CONSTANT)
+    Q_PROPERTY(int c READ c CONSTANT)
+    Q_PROPERTY(int f READ f CONSTANT)
+public:
+    MultiExtensionParent(QObject *parent = nullptr) : QObject(parent) {}
+    int p() const { return 'p'; }
+    int c() const { return 13; }
+    int f() const { return 33; }
+};
+
+class MultiExtension : public MultiExtensionParent
+{
+    Q_OBJECT
+    QML_ELEMENT
+    QML_EXTENDED(ExtensionB)
+    Q_PROPERTY(int e READ e CONSTANT)
+    Q_PROPERTY(int c READ c CONSTANT)
+    Q_PROPERTY(int g READ g CONSTANT)
+public:
+    MultiExtension(QObject *parent = nullptr) : MultiExtensionParent(parent) {}
+    int e() const { return 'e'; }
+    int c() const { return 14; }
+    int g() const { return 44; }
+};
+
+class StringSignaler : public QObject
+{
+    Q_OBJECT
+    QML_ELEMENT
+public:
+    StringSignaler(QObject *parent = nullptr) : QObject(parent) {}
+    Q_INVOKABLE void call() { emit signal(QJSValue("Hello world!")); }
+signals:
+    void signal(QJSValue value);
+};
+
 void registerTypes();
 
 #endif // TESTTYPES_H
diff --git a/tests/auto/qml/qqmllanguage/tst_qqmllanguage.cpp b/tests/auto/qml/qqmllanguage/tst_qqmllanguage.cpp
index bf818b9005..f3b11b4a6b 100644
--- a/tests/auto/qml/qqmllanguage/tst_qqmllanguage.cpp
+++ b/tests/auto/qml/qqmllanguage/tst_qqmllanguage.cpp
@@ -343,6 +343,7 @@ private slots:
     void extendedNamespace();
     void factorySingleton();
     void extendedSingleton();
+    void qtbug_86482();
 
     void invalidInlineComponent();
 
@@ -6105,6 +6106,26 @@ void tst_qqmllanguage::invalidInlineComponent()
     QVERIFY(c.errorString().contains("\"Window.visibility\" is not available in QtQuick 2.0."));
 }
 
+void tst_qqmllanguage::qtbug_86482()
+{
+    QQmlEngine engine;
+    QQmlComponent component(&engine);
+    component.setData(QByteArray(R"(import QtQml 2.0
+                                 import StaticTest
+                                 QtObject {
+                                     id: root
+                                     property string result
+                                     property StringSignaler str: StringSignaler {
+                                        onSignal: function(value) { root.result = value; }
+                                     }
+                                     Component.onCompleted: str.call();
+                                 })"), QUrl());
+    VERIFY_ERRORS(0);
+    QScopedPointer<QObject> o(component.create());
+    QVERIFY2(component.isReady(), qPrintable(component.errorString()));
+    QCOMPARE(o->property("result").toString(), QStringLiteral("Hello world!"));
+}
+
 QTEST_MAIN(tst_qqmllanguage)
 
 #include "tst_qqmllanguage.moc"