Add a default message to QML_UNCREATABLE

[ChangeLog][QML][Feature] Add a default message to QML_UNCREATABLE when
proving an empty string as a reason

Fixes: QTBUG-83842
Change-Id: Ifd2044fa6c56c3a382d451ec47d5f92a1ac16b81
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>

1 files changed, 12 insertions, 0 deletions

diff --git a/tests/auto/qml/qqmllanguage/tst_qqmllanguage.cpp b/tests/auto/qml/qqmllanguage/tst_qqmllanguage.cpp
index 4ea8de5a40..3dbaa2ec4e 100644
--- a/tests/auto/qml/qqmllanguage/tst_qqmllanguage.cpp
+++ b/tests/auto/qml/qqmllanguage/tst_qqmllanguage.cpp
@@ -333,6 +333,7 @@ private slots:
     void arrayToContainer();
     void qualifiedScopeInCustomParser();
 
+    void checkUncreatableNoReason();
 private:
     QQmlEngine engine;
     QStringList defaultImportPathList;
@@ -5839,6 +5840,17 @@ void tst_qqmllanguage::qualifiedScopeInCustomParser()
     QVERIFY(!obj.isNull());
 }
 
+void tst_qqmllanguage::checkUncreatableNoReason()
+{
+    qmlRegisterTypesAndRevisions<UncreatableElementNoReason>("qt.uncreatable.noreason", 1, 0);
+    QQmlEngine engine;
+    QString qml = QString("import QtQuick 2.0\nimport qt.uncreatable.noreason 1.0\nUncreatableElementNoReason {}");
+    QQmlComponent c(&engine);
+    c.setData(qml.toUtf8(), QUrl::fromLocalFile(QDir::currentPath()));
+    QCOMPARE(c.errors().count(), 1);
+    QCOMPARE(c.errors().first().description(), QString("Type cannot be created in QML."));
+}
+
 QTEST_MAIN(tst_qqmllanguage)
 
 #include "tst_qqmllanguage.moc"