Allow threaded compilation in an async Loader

Enables threaded compilation for a Loader "source".

Change-Id: I2d60a3ace07aab58f3b8f069e45a2864178c959f
Reviewed-by: Chris Adams <christopher.adams@nokia.com>

14 files changed, 3251 insertions, 7 deletions

diff --git a/tests/auto/qml/qqmlcomponent/data/TestComponent.2.qml b/tests/auto/qml/qqmlcomponent/data/TestComponent.2.qml
new file mode 100644
index 0000000000..fca43fe2dc
--- /dev/null
+++ b/tests/auto/qml/qqmlcomponent/data/TestComponent.2.qml
@@ -0,0 +1,591 @@
+import QtQuick 2.0
+
+Item {
+    id: root
+    objectName: "root"
+    property int zero: 0
+
+    Item {
+        id: c1
+        objectName: "c1"
+        property int one: zero + 1
+
+        Item {
+            id: c1c1
+            objectName: "c1c1"
+            property bool two: c2c1c1.two
+        }
+
+        Item {
+            id: c1c2
+            objectName: "c1c2"
+            property string three: "three"
+
+            Rectangle {
+                id: c1c2c3
+                objectName: "c1c2c3"
+                property alias othercolor: c2c1.color
+                color: if (c2c1.color == Qt.rgba(0,0,1)) Qt.rgba(1,0,0); else Qt.rgba(0,1,0);
+            }
+        }
+    }
+
+    Item {
+        id: c2
+        objectName: "c2"
+        property string two: "two"
+
+        Rectangle {
+            id: c2c1
+            objectName: "c2c1"
+            property string three: "2" + c1c2.three
+            color: "blue"
+
+            MouseArea {
+                id: c2c1c1
+                objectName: "c2c1c1"
+                property bool two: false
+                onClicked: two = !two
+            }
+
+            Item {
+                id: c2c1c2
+                objectName: "c2c1c2"
+                property string three: "1" + parent.three
+            }
+        }
+    }
+
+    Item {
+        id: c3
+        objectName: "c3"
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+    }
+
+    property bool success: true
+    Component.onCompleted: {
+        // test state after initial bindings evaluation
+        if (zero != 0) success = false;
+        if (c1.one != 1) success = false;
+        if (c1c1.two != false) success = false;
+        if (c1c2.three != "three") success = false;
+        if (c1c2c3.color != Qt.rgba(1,0,0)) success = false;
+        if (c2.two != "two") success = false;
+        if (c2c1.three != "2three") success = false;
+        if (c2c1.color != Qt.rgba(0,0,1)) success = false;
+        if (c2c1c1.two != false) success = false;
+        if (c2c1c2.three != "12three") success = false;
+        if (c3.children.length != 500) success = false;
+
+        // now retrigger bindings evaluation
+        root.zero = 5;
+        if (c1.one != 6) success = false;
+        c2c1c1.two = true;
+        if (c1c1.two != true) success = false;
+        c1c2.three = "3";
+        if (c2c1.three != "23") success = false;
+        if (c2c1c2.three != "123") success = false;
+        c2c1.color = Qt.rgba(1,0,0);
+        if (c1c2c3.color != Qt.rgba(0,1,0)) success = false;
+        if (c1c2c3.othercolor != Qt.rgba(1,0,0)) success = false;
+    }
+}
diff --git a/tests/auto/qml/qqmlcomponent/data/TestComponent.qml b/tests/auto/qml/qqmlcomponent/data/TestComponent.qml
new file mode 100644
index 0000000000..64cec1cd06
--- /dev/null
+++ b/tests/auto/qml/qqmlcomponent/data/TestComponent.qml
@@ -0,0 +1,534 @@
+import QtQuick 2.0
+
+Item {
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+}
diff --git a/tests/auto/qml/qqmlcomponent/qqmlcomponent.pro b/tests/auto/qml/qqmlcomponent/qqmlcomponent.pro
index cf1c398ce5..6667513395 100644
--- a/tests/auto/qml/qqmlcomponent/qqmlcomponent.pro
+++ b/tests/auto/qml/qqmlcomponent/qqmlcomponent.pro
@@ -2,7 +2,11 @@ CONFIG += testcase
 TARGET = tst_qqmlcomponent
 macx:CONFIG -= app_bundle
 
-SOURCES += tst_qqmlcomponent.cpp
+INCLUDEPATH += ../../shared/
+SOURCES += tst_qqmlcomponent.cpp \
+            ../../shared/testhttpserver.cpp
+
+HEADERS += ../../shared/testhttpserver.h
 
 include (../../shared/util.pri)
 
@@ -10,4 +14,4 @@ TESTDATA = data/*
 
 CONFIG += parallel_test
 
-QT += core-private gui-private qml-private network testlib
+QT += core-private gui-private qml-private quick-private network testlib
diff --git a/tests/auto/qml/qqmlcomponent/tst_qqmlcomponent.cpp b/tests/auto/qml/qqmlcomponent/tst_qqmlcomponent.cpp
index 603c091a03..10181aa9b8 100644
--- a/tests/auto/qml/qqmlcomponent/tst_qqmlcomponent.cpp
+++ b/tests/auto/qml/qqmlcomponent/tst_qqmlcomponent.cpp
@@ -45,8 +45,14 @@
 #include <QtQml/qqmlcomponent.h>
 #include <QtQml/qqmlproperty.h>
 #include <QtQml/qqmlincubator.h>
+#include <QtQuick>
+#include <QtQuick/private/qquickrectangle_p.h>
+#include <QtQuick/private/qquickmousearea_p.h>
 #include <qcolor.h>
 #include "../../shared/util.h"
+#include "testhttpserver.h"
+
+#define SERVER_PORT 14450
 
 class MyIC : public QObject, public QQmlIncubationController
 {
@@ -59,6 +65,37 @@ protected:
     }
 };
 
+class ComponentWatcher : public QObject
+{
+    Q_OBJECT
+public:
+    ComponentWatcher(QQmlComponent *comp) : loading(0), error(0), ready(0) {
+        connect(comp, SIGNAL(statusChanged(QQmlComponent::Status)),
+                this, SLOT(statusChanged(QQmlComponent::Status)));
+    }
+
+    int loading;
+    int error;
+    int ready;
+
+public slots:
+    void statusChanged(QQmlComponent::Status status) {
+        switch (status) {
+        case QQmlComponent::Loading:
+            ++loading;
+            break;
+        case QQmlComponent::Error:
+            ++error;
+            break;
+        case QQmlComponent::Ready:
+            ++ready;
+            break;
+        default:
+            break;
+        }
+    }
+};
+
 class tst_qqmlcomponent : public QQmlDataTest
 {
     Q_OBJECT
@@ -72,6 +109,8 @@ private slots:
     void qmlCreateObjectWithProperties();
     void qmlIncubateObject();
     void qmlCreateParentReference();
+    void async();
+    void asyncHierarchy();
 
 private:
     QQmlEngine engine;
@@ -213,6 +252,68 @@ void tst_qqmlcomponent::qmlCreateParentReference()
     QCOMPARE(warnings.count(), 0);
 }
 
+void tst_qqmlcomponent::async()
+{
+    TestHTTPServer server(SERVER_PORT);
+    QVERIFY(server.isValid());
+    server.serveDirectory(dataDirectory());
+
+    QQmlComponent component(&engine);
+    ComponentWatcher watcher(&component);
+    component.loadUrl(QUrl("http://127.0.0.1:14450/TestComponent.qml"), QQmlComponent::Asynchronous);
+    QCOMPARE(watcher.loading, 1);
+    QTRY_VERIFY(component.isReady());
+    QCOMPARE(watcher.ready, 1);
+    QCOMPARE(watcher.error, 0);
+
+    QObject *object = component.create();
+    QVERIFY(object != 0);
+
+    delete object;
+}
+
+void tst_qqmlcomponent::asyncHierarchy()
+{
+    TestHTTPServer server(SERVER_PORT);
+    QVERIFY(server.isValid());
+    server.serveDirectory(dataDirectory());
+
+    // ensure that the item hierarchy is compiled correctly.
+    QQmlComponent component(&engine);
+    ComponentWatcher watcher(&component);
+    component.loadUrl(QUrl("http://127.0.0.1:14450/TestComponent.2.qml"), QQmlComponent::Asynchronous);
+    QCOMPARE(watcher.loading, 1);
+    QTRY_VERIFY(component.isReady());
+    QCOMPARE(watcher.ready, 1);
+    QCOMPARE(watcher.error, 0);
+
+    QObject *root = component.create();
+    QVERIFY(root != 0);
+
+    // ensure that the parent-child relationship hierarchy is correct
+    QQuickItem *c1 = root->findChild<QQuickItem*>("c1", Qt::FindDirectChildrenOnly);
+    QVERIFY(c1);
+    QQuickItem *c1c1 = c1->findChild<QQuickItem*>("c1c1", Qt::FindDirectChildrenOnly);
+    QVERIFY(c1c1);
+    QQuickItem *c1c2 = c1->findChild<QQuickItem*>("c1c2", Qt::FindDirectChildrenOnly);
+    QVERIFY(c1c2);
+    QQuickRectangle *c1c2c3 = c1c2->findChild<QQuickRectangle*>("c1c2c3", Qt::FindDirectChildrenOnly);
+    QVERIFY(c1c2c3);
+    QQuickItem *c2 = root->findChild<QQuickItem*>("c2", Qt::FindDirectChildrenOnly);
+    QVERIFY(c2);
+    QQuickRectangle *c2c1 = c2->findChild<QQuickRectangle*>("c2c1", Qt::FindDirectChildrenOnly);
+    QVERIFY(c2c1);
+    QQuickMouseArea *c2c1c1 = c2c1->findChild<QQuickMouseArea*>("c2c1c1", Qt::FindDirectChildrenOnly);
+    QVERIFY(c2c1c1);
+    QQuickItem *c2c1c2 = c2c1->findChild<QQuickItem*>("c2c1c2", Qt::FindDirectChildrenOnly);
+    QVERIFY(c2c1c2);
+
+    // ensure that values and bindings are assigned correctly
+    QVERIFY(root->property("success").toBool());
+
+    delete root;
+}
+
 QTEST_MAIN(tst_qqmlcomponent)
 
 #include "tst_qqmlcomponent.moc"
diff --git a/tests/auto/qml/qqmlqt/data/TestComponent.2.qml b/tests/auto/qml/qqmlqt/data/TestComponent.2.qml
new file mode 100644
index 0000000000..d6e99028b5
--- /dev/null
+++ b/tests/auto/qml/qqmlqt/data/TestComponent.2.qml
@@ -0,0 +1,592 @@
+import QtQuick 2.0
+
+Item {
+    id: root
+    objectName: "root"
+    property int zero: 0
+
+    Item {
+        id: c1
+        objectName: "c1"
+        property int one: zero + 1
+
+        Item {
+            id: c1c1
+            objectName: "c1c1"
+            property bool two: c2c1c1.two
+        }
+
+        Item {
+            id: c1c2
+            objectName: "c1c2"
+            property string three: "three"
+
+            Rectangle {
+                id: c1c2c3
+                objectName: "c1c2c3"
+                property alias othercolor: c2c1.color
+                color: if (c2c1.color == Qt.rgba(0,0,1)) Qt.rgba(1,0,0); else Qt.rgba(0,1,0);
+            }
+        }
+    }
+
+    Item {
+        id: c2
+        objectName: "c2"
+        property string two: "two"
+
+        Rectangle {
+            id: c2c1
+            objectName: "c2c1"
+            property string three: "2" + c1c2.three
+            color: "blue"
+
+            MouseArea {
+                id: c2c1c1
+                objectName: "c2c1c1"
+                property bool two: false
+                onClicked: two = !two
+            }
+
+            Item {
+                id: c2c1c2
+                objectName: "c2c1c2"
+                property string three: "1" + parent.three
+            }
+        }
+    }
+
+    Item {
+        id: c3
+        objectName: "c3"
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+    }
+
+    property alias c1one: c1.one
+    property bool success: true
+    Component.onCompleted: {
+        // test state after initial bindings evaluation
+        if (zero != 0) success = false;
+        if (c1.one != 1) success = false;
+        if (c1c1.two != false) success = false;
+        if (c1c2.three != "three") success = false;
+        if (c1c2c3.color != Qt.rgba(1,0,0)) success = false;
+        if (c2.two != "two") success = false;
+        if (c2c1.three != "2three") success = false;
+        if (c2c1.color != Qt.rgba(0,0,1)) success = false;
+        if (c2c1c1.two != false) success = false;
+        if (c2c1c2.three != "12three") success = false;
+        if (c3.children.length != 500) success = false;
+
+        // now retrigger bindings evaluation
+        root.zero = 5;
+        if (c1.one != 6) success = false;
+        c2c1c1.two = true;
+        if (c1c1.two != true) success = false;
+        c1c2.three = "3";
+        if (c2c1.three != "23") success = false;
+        if (c2c1c2.three != "123") success = false;
+        c2c1.color = Qt.rgba(1,0,0);
+        if (c1c2c3.color != Qt.rgba(0,1,0)) success = false;
+        if (c1c2c3.othercolor != Qt.rgba(1,0,0)) success = false;
+    }
+}
diff --git a/tests/auto/qml/qqmlqt/data/TestComponent.3.qml b/tests/auto/qml/qqmlqt/data/TestComponent.3.qml
new file mode 100644
index 0000000000..81ea07cb88
--- /dev/null
+++ b/tests/auto/qml/qqmlqt/data/TestComponent.3.qml
@@ -0,0 +1,89 @@
+import QtQuick 2.0
+
+Item {
+    id: root
+    objectName: "root"
+    property int zero: 0
+    property int one: 1
+
+    Item {
+        id: c1
+        objectName: "c1"
+        property int one: zero + parent.one
+
+        Item {
+            id: c1c1
+            objectName: "c1c1"
+            property bool two: c2c1c1.two
+        }
+
+        Item {
+            id: c1c2
+            objectName: "c1c2"
+            property string three: "three"
+
+            Rectangle {
+                id: c1c2c3
+                objectName: "c1c2c3"
+                property alias othercolor: c2c1.color
+                color: if (c2c1.color == Qt.rgba(0,0,1)) Qt.rgba(1,0,0); else Qt.rgba(0,1,0);
+            }
+        }
+    }
+
+    Item {
+        id: c2
+        objectName: "c2"
+        property string two: "two"
+
+        Rectangle {
+            id: c2c1
+            objectName: "c2c1"
+            property string three: "2" + c1c2.three
+            color: "blue"
+
+            MouseArea {
+                id: c2c1c1
+                objectName: "c2c1c1"
+                property bool two: false
+                onClicked: two = !two
+            }
+
+            Item {
+                id: c2c1c2
+                objectName: "c2c1c2"
+                property string three: "1" + parent.three
+            }
+        }
+    }
+
+    property alias c1one: c1.one
+    property bool success: true
+    Component.onCompleted: {
+        // test state after initial bindings evaluation
+        if (zero != 0) success = false;
+        if (c1.one != 1) success = false;
+        if (c1c1.two != false) success = false;
+        if (c1c2.three != "three") success = false;
+        if (c1c2c3.color != Qt.rgba(1,0,0)) success = false;
+        if (c2.two != "two") success = false;
+        if (c2c1.three != "2three") success = false;
+        if (c2c1.color != Qt.rgba(0,0,1)) success = false;
+        if (c2c1c1.two != false) success = false;
+        if (c2c1c2.three != "12three") success = false;
+
+        // now retrigger bindings evaluation
+        root.zero = 5;
+        if (c1.one != 6) success = false;
+        root.one = 50;
+        if (c1.one != 55) success = false;
+        c2c1c1.two = true;
+        if (c1c1.two != true) success = false;
+        c1c2.three = "3";
+        if (c2c1.three != "23") success = false;
+        if (c2c1c2.three != "123") success = false;
+        c2c1.color = Qt.rgba(1,0,0);
+        if (c1c2c3.color != Qt.rgba(0,1,0)) success = false;
+        if (c1c2c3.othercolor != Qt.rgba(1,0,0)) success = false;
+    }
+}
diff --git a/tests/auto/qml/qqmlqt/data/TestComponent.qml b/tests/auto/qml/qqmlqt/data/TestComponent.qml
new file mode 100644
index 0000000000..64cec1cd06
--- /dev/null
+++ b/tests/auto/qml/qqmlqt/data/TestComponent.qml
@@ -0,0 +1,534 @@
+import QtQuick 2.0
+
+Item {
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+    Item {}
+}
diff --git a/tests/auto/qml/qqmlqt/data/createComponent.2.qml b/tests/auto/qml/qqmlqt/data/createComponent.2.qml
new file mode 100644
index 0000000000..36e2b23c9f
--- /dev/null
+++ b/tests/auto/qml/qqmlqt/data/createComponent.2.qml
@@ -0,0 +1,27 @@
+import QtQuick 2.0
+
+Item {
+    property bool success: false
+    property var syncComponent
+    property var asyncComponent
+
+    function asyncStatusChanged() {
+        if (asyncComponent.status == Component.Ready && syncComponent.status == Component.Ready) {
+            success = true;
+            var ao = asyncComponent.createObject();
+            var so = syncComponent.createObject();
+            if (ao.c1one != 6) success = false;
+            if (so.c1one != 55) success = false;
+            ao.destroy();
+            so.destroy();
+        }
+    }
+
+    Component.onCompleted: {
+        asyncComponent = Qt.createComponent("TestComponent.2.qml", Component.Asynchronous);
+        if (asyncComponent.status != Component.Loading)
+            return;
+        asyncComponent.statusChanged.connect(asyncStatusChanged);
+        syncComponent = Qt.createComponent("TestComponent.3.qml", Component.PreferSynchronous);
+    }
+}
diff --git a/tests/auto/qml/qqmlqt/data/createComponent.qml b/tests/auto/qml/qqmlqt/data/createComponent.qml
index 3ebc9f14f8..01b6490419 100644
--- a/tests/auto/qml/qqmlqt/data/createComponent.qml
+++ b/tests/auto/qml/qqmlqt/data/createComponent.qml
@@ -9,6 +9,14 @@ QtObject {
     property QtObject incorectArgCount1: Qt.createComponent()
     property QtObject incorectArgCount2: Qt.createComponent("main.qml", 10)
 
+    property bool asyncResult: false
+    property var asyncComponent
+
+    function asyncStatusChanged() {
+        if (asyncComponent.status == Component.Ready)
+            asyncResult = true;
+    }
+
     Component.onCompleted: {
         emptyArg = (Qt.createComponent("") == null);
         var r = Qt.createComponent("createComponentData.qml");
@@ -16,5 +24,10 @@ QtObject {
 
         var a = Qt.createComponent("http://www.example.com/test.qml");
         absoluteUrl = a.url;
+
+        asyncComponent = Qt.createComponent("TestComponent.qml", Component.Asynchronous);
+        if (asyncComponent.status != Component.Loading)
+            return;
+        asyncComponent.statusChanged.connect(asyncStatusChanged);
     }
 }
diff --git a/tests/auto/qml/qqmlqt/tst_qqmlqt.cpp b/tests/auto/qml/qqmlqt/tst_qqmlqt.cpp
index a679188cb7..d3dc3e7343 100644
--- a/tests/auto/qml/qqmlqt/tst_qqmlqt.cpp
+++ b/tests/auto/qml/qqmlqt/tst_qqmlqt.cpp
@@ -395,6 +395,7 @@ void tst_qqmlqt::md5()
 
 void tst_qqmlqt::createComponent()
 {
+    {
     QQmlComponent component(&engine, testFileUrl("createComponent.qml"));
 
     QString warning1 = component.url().toString() + ":9: Error: Qt.createComponent(): Invalid arguments";
@@ -408,7 +409,19 @@ void tst_qqmlqt::createComponent()
     QCOMPARE(object->property("absoluteUrl").toString(), QString("http://www.example.com/test.qml"));
     QCOMPARE(object->property("relativeUrl").toString(), testFileUrl("createComponentData.qml").toString());
 
+    QTRY_VERIFY(object->property("asyncResult").toBool());
+
     delete object;
+    }
+
+    // simultaneous sync and async compilation
+    {
+    QQmlComponent component(&engine, testFileUrl("createComponent.2.qml"));
+    QObject *object = component.create();
+    QVERIFY(object != 0);
+    QTRY_VERIFY(object->property("success").toBool());
+    delete object;
+    }
 }
 
 void tst_qqmlqt::createComponent_pragmaLibrary()
diff --git a/tests/auto/quick/qquickloader/data/TestComponent.2.qml b/tests/auto/quick/qquickloader/data/TestComponent.2.qml
new file mode 100644
index 0000000000..d6e99028b5
--- /dev/null
+++ b/tests/auto/quick/qquickloader/data/TestComponent.2.qml
@@ -0,0 +1,592 @@
+import QtQuick 2.0
+
+Item {
+    id: root
+    objectName: "root"
+    property int zero: 0
+
+    Item {
+        id: c1
+        objectName: "c1"
+        property int one: zero + 1
+
+        Item {
+            id: c1c1
+            objectName: "c1c1"
+            property bool two: c2c1c1.two
+        }
+
+        Item {
+            id: c1c2
+            objectName: "c1c2"
+            property string three: "three"
+
+            Rectangle {
+                id: c1c2c3
+                objectName: "c1c2c3"
+                property alias othercolor: c2c1.color
+                color: if (c2c1.color == Qt.rgba(0,0,1)) Qt.rgba(1,0,0); else Qt.rgba(0,1,0);
+            }
+        }
+    }
+
+    Item {
+        id: c2
+        objectName: "c2"
+        property string two: "two"
+
+        Rectangle {
+            id: c2c1
+            objectName: "c2c1"
+            property string three: "2" + c1c2.three
+            color: "blue"
+
+            MouseArea {
+                id: c2c1c1
+                objectName: "c2c1c1"
+                property bool two: false
+                onClicked: two = !two
+            }
+
+            Item {
+                id: c2c1c2
+                objectName: "c2c1c2"
+                property string three: "1" + parent.three
+            }
+        }
+    }
+
+    Item {
+        id: c3
+        objectName: "c3"
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+        Item {}
+    }
+
+    property alias c1one: c1.one
+    property bool success: true
+    Component.onCompleted: {
+        // test state after initial bindings evaluation
+        if (zero != 0) success = false;
+        if (c1.one != 1) success = false;
+        if (c1c1.two != false) success = false;
+        if (c1c2.three != "three") success = false;
+        if (c1c2c3.color != Qt.rgba(1,0,0)) success = false;
+        if (c2.two != "two") success = false;
+        if (c2c1.three != "2three") success = false;
+        if (c2c1.color != Qt.rgba(0,0,1)) success = false;
+        if (c2c1c1.two != false) success = false;
+        if (c2c1c2.three != "12three") success = false;
+        if (c3.children.length != 500) success = false;
+
+        // now retrigger bindings evaluation
+        root.zero = 5;
+        if (c1.one != 6) success = false;
+        c2c1c1.two = true;
+        if (c1c1.two != true) success = false;
+        c1c2.three = "3";
+        if (c2c1.three != "23") success = false;
+        if (c2c1c2.three != "123") success = false;
+        c2c1.color = Qt.rgba(1,0,0);
+        if (c1c2c3.color != Qt.rgba(0,1,0)) success = false;
+        if (c1c2c3.othercolor != Qt.rgba(1,0,0)) success = false;
+    }
+}
diff --git a/tests/auto/quick/qquickloader/data/TestComponent.qml b/tests/auto/quick/qquickloader/data/TestComponent.qml
new file mode 100644
index 0000000000..81ea07cb88
--- /dev/null
+++ b/tests/auto/quick/qquickloader/data/TestComponent.qml
@@ -0,0 +1,89 @@
+import QtQuick 2.0
+
+Item {
+    id: root
+    objectName: "root"
+    property int zero: 0
+    property int one: 1
+
+    Item {
+        id: c1
+        objectName: "c1"
+        property int one: zero + parent.one
+
+        Item {
+            id: c1c1
+            objectName: "c1c1"
+            property bool two: c2c1c1.two
+        }
+
+        Item {
+            id: c1c2
+            objectName: "c1c2"
+            property string three: "three"
+
+            Rectangle {
+                id: c1c2c3
+                objectName: "c1c2c3"
+                property alias othercolor: c2c1.color
+                color: if (c2c1.color == Qt.rgba(0,0,1)) Qt.rgba(1,0,0); else Qt.rgba(0,1,0);
+            }
+        }
+    }
+
+    Item {
+        id: c2
+        objectName: "c2"
+        property string two: "two"
+
+        Rectangle {
+            id: c2c1
+            objectName: "c2c1"
+            property string three: "2" + c1c2.three
+            color: "blue"
+
+            MouseArea {
+                id: c2c1c1
+                objectName: "c2c1c1"
+                property bool two: false
+                onClicked: two = !two
+            }
+
+            Item {
+                id: c2c1c2
+                objectName: "c2c1c2"
+                property string three: "1" + parent.three
+            }
+        }
+    }
+
+    property alias c1one: c1.one
+    property bool success: true
+    Component.onCompleted: {
+        // test state after initial bindings evaluation
+        if (zero != 0) success = false;
+        if (c1.one != 1) success = false;
+        if (c1c1.two != false) success = false;
+        if (c1c2.three != "three") success = false;
+        if (c1c2c3.color != Qt.rgba(1,0,0)) success = false;
+        if (c2.two != "two") success = false;
+        if (c2c1.three != "2three") success = false;
+        if (c2c1.color != Qt.rgba(0,0,1)) success = false;
+        if (c2c1c1.two != false) success = false;
+        if (c2c1c2.three != "12three") success = false;
+
+        // now retrigger bindings evaluation
+        root.zero = 5;
+        if (c1.one != 6) success = false;
+        root.one = 50;
+        if (c1.one != 55) success = false;
+        c2c1c1.two = true;
+        if (c1c1.two != true) success = false;
+        c1c2.three = "3";
+        if (c2c1.three != "23") success = false;
+        if (c2c1c2.three != "123") success = false;
+        c2c1.color = Qt.rgba(1,0,0);
+        if (c1c2c3.color != Qt.rgba(0,1,0)) success = false;
+        if (c1c2c3.othercolor != Qt.rgba(1,0,0)) success = false;
+    }
+}
diff --git a/tests/auto/quick/qquickloader/data/simultaneous.qml b/tests/auto/quick/qquickloader/data/simultaneous.qml
new file mode 100644
index 0000000000..cab6498863
--- /dev/null
+++ b/tests/auto/quick/qquickloader/data/simultaneous.qml
@@ -0,0 +1,22 @@
+import QtQuick 2.0
+
+Rectangle {
+    width: 400; height: 400
+
+    function loadComponents() {
+        asyncLoader.source = "TestComponent.2.qml"
+        syncLoader.source = "TestComponent.qml"
+    }
+
+    Loader {
+        id: asyncLoader
+        objectName: "asyncLoader"
+        asynchronous: true
+    }
+
+    Loader {
+        id: syncLoader
+        objectName: "syncLoader"
+        asynchronous: false
+    }
+}
diff --git a/tests/auto/quick/qquickloader/tst_qquickloader.cpp b/tests/auto/quick/qquickloader/tst_qquickloader.cpp
index 77d0c29220..b388243a1d 100644
--- a/tests/auto/quick/qquickloader/tst_qquickloader.cpp
+++ b/tests/auto/quick/qquickloader/tst_qquickloader.cpp
@@ -56,13 +56,21 @@ class PeriodicIncubationController : public QObject,
 {
 public:
     PeriodicIncubationController() {
+        incubated = false;
         startTimer(16);
     }
 
+    bool incubated;
+
 protected:
     virtual void timerEvent(QTimerEvent *) {
         incubateFor(15);
     }
+
+    virtual void incubatingObjectCountChanged(int count) {
+        if (count)
+            incubated = true;
+    }
 };
 
 class tst_QQuickLoader : public QQmlDataTest
@@ -102,6 +110,7 @@ private slots:
     void asynchronous_data();
     void asynchronous();
     void asynchronous_clear();
+    void simultaneousSyncAsync();
 
     void parented();
     void sizeBound();
@@ -481,7 +490,7 @@ void tst_QQuickLoader::failNetworkRequest()
     QTRY_VERIFY(loader->status() == QQuickLoader::Error);
 
     QVERIFY(loader->item() == 0);
-    QCOMPARE(loader->progress(), 0.0);
+    QCOMPARE(loader->progress(), 1.0);
     QCOMPARE(loader->property("did_load").toInt(), 123);
     QCOMPARE(static_cast<QQuickItem*>(loader)->childItems().count(), 0);
 
@@ -856,7 +865,7 @@ void tst_QQuickLoader::asynchronous_data()
     QTest::newRow("Valid component") << testFileUrl("BigComponent.qml")
             << QStringList();
 
-    QTest::newRow("Non-existant component") << testFileUrl("IDoNotExist.qml")
+    QTest::newRow("Non-existent component") << testFileUrl("IDoNotExist.qml")
             << (QStringList() << QString(testFileUrl("IDoNotExist.qml").toString() + ": File not found"));
 
     QTest::newRow("Invalid component") << testFileUrl("InvalidSourceComponent.qml")
@@ -870,6 +879,8 @@ void tst_QQuickLoader::asynchronous()
 
     if (!engine.incubationController())
         engine.setIncubationController(new PeriodicIncubationController);
+    PeriodicIncubationController *controller = static_cast<PeriodicIncubationController*>(engine.incubationController());
+    controller->incubated = false;
     QQmlComponent component(&engine, testFileUrl("asynchronous.qml"));
     QQuickItem *root = qobject_cast<QQuickItem*>(component.create());
     QVERIFY(root);
@@ -881,19 +892,20 @@ void tst_QQuickLoader::asynchronous()
         QTest::ignoreMessage(QtWarningMsg, warning.toUtf8().constData());
 
     QVERIFY(!loader->item());
+    QCOMPARE(loader->progress(), 0.0);
     root->setProperty("comp", qmlFile.toString());
     QMetaObject::invokeMethod(root, "loadComponent");
     QVERIFY(!loader->item());
 
     if (expectedWarnings.isEmpty()) {
         QCOMPARE(loader->status(), QQuickLoader::Loading);
-        QCOMPARE(engine.incubationController()->incubatingObjectCount(), 1);
-
+        QVERIFY(!controller->incubated); // asynchronous compilation means not immediately compiled/incubating.
+        QTRY_VERIFY(controller->incubated); // but should start incubating once compilation is complete.
         QTRY_VERIFY(loader->item());
         QCOMPARE(loader->progress(), 1.0);
         QCOMPARE(loader->status(), QQuickLoader::Ready);
     } else {
-        QCOMPARE(loader->progress(), 1.0);
+        QTRY_COMPARE(loader->progress(), 1.0);
         QTRY_COMPARE(loader->status(), QQuickLoader::Error);
     }
 
@@ -943,6 +955,37 @@ void tst_QQuickLoader::asynchronous_clear()
     QCOMPARE(static_cast<QQuickItem*>(loader)->childItems().count(), 1);
 }
 
+void tst_QQuickLoader::simultaneousSyncAsync()
+{
+    if (!engine.incubationController())
+        engine.setIncubationController(new PeriodicIncubationController);
+    PeriodicIncubationController *controller = static_cast<PeriodicIncubationController*>(engine.incubationController());
+    controller->incubated = false;
+    QQmlComponent component(&engine, testFileUrl("simultaneous.qml"));
+    QQuickItem *root = qobject_cast<QQuickItem*>(component.create());
+    QVERIFY(root);
+
+    QQuickLoader *asyncLoader = root->findChild<QQuickLoader*>("asyncLoader");
+    QQuickLoader *syncLoader = root->findChild<QQuickLoader*>("syncLoader");
+    QVERIFY(asyncLoader);
+    QVERIFY(syncLoader);
+
+    QVERIFY(!asyncLoader->item());
+    QVERIFY(!syncLoader->item());
+    QMetaObject::invokeMethod(root, "loadComponents");
+    QVERIFY(!asyncLoader->item());
+    QVERIFY(syncLoader->item());
+
+    QCOMPARE(asyncLoader->status(), QQuickLoader::Loading);
+    QVERIFY(!controller->incubated); // asynchronous compilation means not immediately compiled/incubating.
+    QTRY_VERIFY(controller->incubated); // but should start incubating once compilation is complete.
+    QTRY_VERIFY(asyncLoader->item());
+    QCOMPARE(asyncLoader->progress(), 1.0);
+    QCOMPARE(asyncLoader->status(), QQuickLoader::Ready);
+
+    delete root;
+}
+
 void tst_QQuickLoader::parented()
 {
     QQmlComponent component(&engine, testFileUrl("parented.qml"));