Unit Tests for QCameraLens

Change-Id: I2e580ea9cd382aff0224b38a9a1431c67661666b
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>

3 files changed, 731 insertions, 1 deletions

diff --git a/tests/auto/render/qcameralens/qcameralens.pro b/tests/auto/render/qcameralens/qcameralens.pro
new file mode 100644
index 000000000..0f517d5ef
--- /dev/null
+++ b/tests/auto/render/qcameralens/qcameralens.pro
@@ -0,0 +1,12 @@
+TEMPLATE = app
+
+TARGET = tst_qcameralens
+
+QT += 3dcore 3dcore-private 3drender 3drender-private testlib
+
+CONFIG += testcase
+
+SOURCES += tst_qcameralens.cpp
+
+include(../../core/common/common.pri)
+include(../commons/commons.pri)
diff --git a/tests/auto/render/qcameralens/tst_qcameralens.cpp b/tests/auto/render/qcameralens/tst_qcameralens.cpp
new file mode 100644
index 000000000..aab43d553
--- /dev/null
+++ b/tests/auto/render/qcameralens/tst_qcameralens.cpp
@@ -0,0 +1,717 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 Paul Lemire <paul.lemire350@gmail.com>
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the Qt3D module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:GPL-EXCEPT$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+
+#include <QtTest/QTest>
+#include <Qt3DRender/qcameralens.h>
+#include <Qt3DRender/private/qcameralens_p.h>
+#include <QObject>
+#include <QSignalSpy>
+#include <Qt3DCore/qpropertyupdatedchange.h>
+#include <Qt3DCore/private/qnodecreatedchangegenerator_p.h>
+#include <Qt3DCore/qnodecreatedchange.h>
+#include "testpostmanarbiter.h"
+
+class tst_QCameraLens : public QObject
+{
+    Q_OBJECT
+
+private Q_SLOTS:
+
+    void initTestCase()
+    {
+        qRegisterMetaType<Qt3DRender::QCameraLens::ProjectionType>("QCameraLens::ProjectionType");
+    }
+
+    void checkDefaultConstruction()
+    {
+        // GIVEN
+        Qt3DRender::QCameraLens cameraLens;
+
+        // THEN
+        QCOMPARE(cameraLens.projectionType(), Qt3DRender::QCameraLens::PerspectiveProjection);
+        QCOMPARE(cameraLens.nearPlane(), 0.1f);
+        QCOMPARE(cameraLens.farPlane(), 1024.0f);
+        QCOMPARE(cameraLens.fieldOfView(), 25.0f);
+        QCOMPARE(cameraLens.aspectRatio(), 1.0f);
+        QCOMPARE(cameraLens.left(), -0.5f);
+        QCOMPARE(cameraLens.right(), 0.5f);
+        QCOMPARE(cameraLens.bottom(), -0.5f);
+        QCOMPARE(cameraLens.top(), 0.5f);
+    }
+
+    void checkPropertyChanges()
+    {
+        // GIVEN
+        Qt3DRender::QCameraLens cameraLens;
+
+        {
+            // WHEN
+            QSignalSpy spy(&cameraLens, SIGNAL(projectionTypeChanged(QCameraLens::ProjectionType)));
+            const Qt3DRender::QCameraLens::ProjectionType newValue = Qt3DRender::QCameraLens::OrthographicProjection;
+            cameraLens.setProjectionType(newValue);
+
+            // THEN
+            QVERIFY(spy.isValid());
+            QCOMPARE(cameraLens.projectionType(), newValue);
+            QCOMPARE(spy.count(), 1);
+
+            // WHEN
+            spy.clear();
+            cameraLens.setProjectionType(newValue);
+
+            // THEN
+            QCOMPARE(cameraLens.projectionType(), newValue);
+            QCOMPARE(spy.count(), 0);
+        }
+        {
+            // WHEN
+            QSignalSpy spy(&cameraLens, SIGNAL(nearPlaneChanged(float)));
+            const float newValue = 10.0f;
+            cameraLens.setNearPlane(newValue);
+
+            // THEN
+            QVERIFY(spy.isValid());
+            QCOMPARE(cameraLens.nearPlane(), newValue);
+            QCOMPARE(spy.count(), 1);
+
+            // WHEN
+            spy.clear();
+            cameraLens.setNearPlane(newValue);
+
+            // THEN
+            QCOMPARE(cameraLens.nearPlane(), newValue);
+            QCOMPARE(spy.count(), 0);
+        }
+        {
+            // WHEN
+            QSignalSpy spy(&cameraLens, SIGNAL(farPlaneChanged(float)));
+            const float newValue = 1.0f;
+            cameraLens.setFarPlane(newValue);
+
+            // THEN
+            QVERIFY(spy.isValid());
+            QCOMPARE(cameraLens.farPlane(), newValue);
+            QCOMPARE(spy.count(), 1);
+
+            // WHEN
+            spy.clear();
+            cameraLens.setFarPlane(newValue);
+
+            // THEN
+            QCOMPARE(cameraLens.farPlane(), newValue);
+            QCOMPARE(spy.count(), 0);
+        }
+        {
+            // WHEN
+            QSignalSpy spy(&cameraLens, SIGNAL(fieldOfViewChanged(float)));
+            const float newValue = 5.0f;
+            cameraLens.setFieldOfView(newValue);
+
+            // THEN
+            QVERIFY(spy.isValid());
+            QCOMPARE(cameraLens.fieldOfView(), newValue);
+            QCOMPARE(spy.count(), 1);
+
+            // WHEN
+            spy.clear();
+            cameraLens.setFieldOfView(newValue);
+
+            // THEN
+            QCOMPARE(cameraLens.fieldOfView(), newValue);
+            QCOMPARE(spy.count(), 0);
+        }
+        {
+            // WHEN
+            QSignalSpy spy(&cameraLens, SIGNAL(aspectRatioChanged(float)));
+            const float newValue = 4.0f / 3.0f;
+            cameraLens.setAspectRatio(newValue);
+
+            // THEN
+            QVERIFY(spy.isValid());
+            QCOMPARE(cameraLens.aspectRatio(), newValue);
+            QCOMPARE(spy.count(), 1);
+
+            // WHEN
+            spy.clear();
+            cameraLens.setAspectRatio(newValue);
+
+            // THEN
+            QCOMPARE(cameraLens.aspectRatio(), newValue);
+            QCOMPARE(spy.count(), 0);
+        }
+        {
+            // WHEN
+            QSignalSpy spy(&cameraLens, SIGNAL(leftChanged(float)));
+            const float newValue = 0.0f;
+            cameraLens.setLeft(newValue);
+
+            // THEN
+            QVERIFY(spy.isValid());
+            QCOMPARE(cameraLens.left(), newValue);
+            QCOMPARE(spy.count(), 1);
+
+            // WHEN
+            spy.clear();
+            cameraLens.setLeft(newValue);
+
+            // THEN
+            QCOMPARE(cameraLens.left(), newValue);
+            QCOMPARE(spy.count(), 0);
+        }
+        {
+            // WHEN
+            QSignalSpy spy(&cameraLens, SIGNAL(rightChanged(float)));
+            const float newValue = 1.0f;
+            cameraLens.setRight(newValue);
+
+            // THEN
+            QVERIFY(spy.isValid());
+            QCOMPARE(cameraLens.right(), newValue);
+            QCOMPARE(spy.count(), 1);
+
+            // WHEN
+            spy.clear();
+            cameraLens.setRight(newValue);
+
+            // THEN
+            QCOMPARE(cameraLens.right(), newValue);
+            QCOMPARE(spy.count(), 0);
+        }
+        {
+            // WHEN
+            QSignalSpy spy(&cameraLens, SIGNAL(bottomChanged(float)));
+            const float newValue = 2.0f;
+            cameraLens.setBottom(newValue);
+
+            // THEN
+            QVERIFY(spy.isValid());
+            QCOMPARE(cameraLens.bottom(), newValue);
+            QCOMPARE(spy.count(), 1);
+
+            // WHEN
+            spy.clear();
+            cameraLens.setBottom(newValue);
+
+            // THEN
+            QCOMPARE(cameraLens.bottom(), newValue);
+            QCOMPARE(spy.count(), 0);
+        }
+        {
+            // WHEN
+            QSignalSpy spy(&cameraLens, SIGNAL(topChanged(float)));
+            const float newValue = -2.0f;
+            cameraLens.setTop(newValue);
+
+            // THEN
+            QVERIFY(spy.isValid());
+            QCOMPARE(cameraLens.top(), newValue);
+            QCOMPARE(spy.count(), 1);
+
+            // WHEN
+            spy.clear();
+            cameraLens.setTop(newValue);
+
+            // THEN
+            QCOMPARE(cameraLens.top(), newValue);
+            QCOMPARE(spy.count(), 0);
+        }
+        {
+            // WHEN
+            QSignalSpy spy(&cameraLens, SIGNAL(projectionMatrixChanged(QMatrix4x4)));
+            QMatrix4x4 newValue;
+            newValue.translate(5.0f, 2.0f, 4.3f);
+            cameraLens.setProjectionMatrix(newValue);
+
+            // THEN
+            QVERIFY(spy.isValid());
+            QCOMPARE(cameraLens.projectionMatrix(), newValue);
+            QCOMPARE(cameraLens.projectionType(), Qt3DRender::QCameraLens::CustomProjection);
+            QCOMPARE(spy.count(), 1);
+
+            // WHEN
+            spy.clear();
+            cameraLens.setProjectionMatrix(newValue);
+
+            // THEN
+            QCOMPARE(cameraLens.projectionMatrix(), newValue);
+            QCOMPARE(spy.count(), 0);
+        }
+    }
+
+    void checkSetOrthographicProjection()
+    {
+        // GIVEN
+        Qt3DRender::QCameraLens cameraLens;
+
+        {
+            // WHEN
+            QSignalSpy spy(&cameraLens, SIGNAL(projectionMatrixChanged(QMatrix4x4)));
+            cameraLens.setOrthographicProjection(-1.0f, 1.0f, -1.0f, 1.0f, 0.5f, 50.0f);
+
+            // THEN
+            QVERIFY(spy.isValid());
+            QCOMPARE(spy.count(), 8); // Triggered for each property being set + 1
+            QCOMPARE(cameraLens.projectionType(), Qt3DRender::QCameraLens::OrthographicProjection);
+            QCOMPARE(cameraLens.nearPlane(), 0.5f);
+            QCOMPARE(cameraLens.farPlane(), 50.0f);
+            QCOMPARE(cameraLens.left(), -1.0f);
+            QCOMPARE(cameraLens.right(), 1.0f);
+            QCOMPARE(cameraLens.bottom(), -1.0f);
+            QCOMPARE(cameraLens.top(), 1.0f);
+        }
+    }
+
+    void checkSetPerspectiveProjection()
+    {
+        // GIVEN
+        Qt3DRender::QCameraLens cameraLens;
+
+        {
+            // WHEN
+            QSignalSpy spy(&cameraLens, SIGNAL(projectionMatrixChanged(QMatrix4x4)));
+            cameraLens.setPerspectiveProjection(20.0f, 16.0f / 9.0f, 0.5f, 50.0f);
+
+            // THEN
+            QVERIFY(spy.isValid());
+            QCOMPARE(spy.count(), 5); // Triggered for each property being set (- projectionTye which is the default value) + 1
+            QCOMPARE(cameraLens.projectionType(), Qt3DRender::QCameraLens::PerspectiveProjection);
+            QCOMPARE(cameraLens.nearPlane(), 0.5f);
+            QCOMPARE(cameraLens.farPlane(), 50.0f);
+            QCOMPARE(cameraLens.fieldOfView(), 20.0f);
+            QCOMPARE(cameraLens.aspectRatio(), 16.0f / 9.0f);
+        }
+    }
+
+    void checkSetFrustumProjection()
+    {
+        // GIVEN
+        Qt3DRender::QCameraLens cameraLens;
+
+        {
+            // WHEN
+            QSignalSpy spy(&cameraLens, SIGNAL(projectionMatrixChanged(QMatrix4x4)));
+            cameraLens.setFrustumProjection(-1.0f, 1.0f, -1.0f, 1.0f, 0.5f, 50.0f);
+
+            // THEN
+            QVERIFY(spy.isValid());
+            QCOMPARE(spy.count(), 8); // Triggered for each property being set + 1
+            QCOMPARE(cameraLens.projectionType(), Qt3DRender::QCameraLens::FrustumProjection);
+            QCOMPARE(cameraLens.nearPlane(), 0.5f);
+            QCOMPARE(cameraLens.farPlane(), 50.0f);
+            QCOMPARE(cameraLens.left(), -1.0f);
+            QCOMPARE(cameraLens.right(), 1.0f);
+            QCOMPARE(cameraLens.bottom(), -1.0f);
+            QCOMPARE(cameraLens.top(), 1.0f);
+        }
+    }
+
+    void checkCreationData()
+    {
+        // GIVEN
+        Qt3DRender::QCameraLens cameraLens;
+
+        cameraLens.setNearPlane(0.5);
+        cameraLens.setFarPlane(1005.0f);
+        cameraLens.setFieldOfView(35.0f);
+        cameraLens.setAspectRatio(16.0f/9.0f);
+
+        // WHEN
+        QVector<Qt3DCore::QNodeCreatedChangeBasePtr> creationChanges;
+
+        {
+            Qt3DCore::QNodeCreatedChangeGenerator creationChangeGenerator(&cameraLens);
+            creationChanges = creationChangeGenerator.creationChanges();
+        }
+
+        // THEN
+        {
+            QCOMPARE(creationChanges.size(), 1);
+
+            const auto creationChangeData = qSharedPointerCast<Qt3DCore::QNodeCreatedChange<Qt3DRender::QCameraLensData>>(creationChanges.first());
+            const Qt3DRender::QCameraLensData cloneData = creationChangeData->data;
+
+            QCOMPARE(cameraLens.projectionMatrix(), cloneData.projectionMatrix);
+            QCOMPARE(cameraLens.id(), creationChangeData->subjectId());
+            QCOMPARE(cameraLens.isEnabled(), true);
+            QCOMPARE(cameraLens.isEnabled(), creationChangeData->isNodeEnabled());
+            QCOMPARE(cameraLens.metaObject(), creationChangeData->metaObject());
+        }
+
+        // WHEN
+        cameraLens.setEnabled(false);
+
+        {
+            Qt3DCore::QNodeCreatedChangeGenerator creationChangeGenerator(&cameraLens);
+            creationChanges = creationChangeGenerator.creationChanges();
+        }
+
+        // THEN
+        {
+            QCOMPARE(creationChanges.size(), 1);
+
+            const auto creationChangeData = qSharedPointerCast<Qt3DCore::QNodeCreatedChange<Qt3DRender::QCameraLensData>>(creationChanges.first());
+            const Qt3DRender::QCameraLensData cloneData = creationChangeData->data;
+
+            QCOMPARE(cameraLens.projectionMatrix(), cloneData.projectionMatrix);
+            QCOMPARE(cameraLens.id(), creationChangeData->subjectId());
+            QCOMPARE(cameraLens.isEnabled(), false);
+            QCOMPARE(cameraLens.isEnabled(), creationChangeData->isNodeEnabled());
+            QCOMPARE(cameraLens.metaObject(), creationChangeData->metaObject());
+        }
+    }
+
+    void checkProjectionTypeUpdate()
+    {
+        // GIVEN
+        TestArbiter arbiter;
+        Qt3DRender::QCameraLens cameraLens;
+        arbiter.setArbiterOnNode(&cameraLens);
+
+        {
+            // WHEN
+            cameraLens.setProjectionType(Qt3DRender::QCameraLens::FrustumProjection);
+            QCoreApplication::processEvents();
+
+            // THEN
+            QCOMPARE(arbiter.events.size(), 1);
+            auto change = arbiter.events.first().staticCast<Qt3DCore::QPropertyUpdatedChange>();
+            QCOMPARE(change->propertyName(), "projectionMatrix");
+            QCOMPARE(change->type(), Qt3DCore::PropertyUpdated);
+
+            arbiter.events.clear();
+        }
+
+        {
+            // WHEN
+            cameraLens.setProjectionType(Qt3DRender::QCameraLens::FrustumProjection);
+            QCoreApplication::processEvents();
+
+            // THEN
+            QCOMPARE(arbiter.events.size(), 0);
+        }
+
+    }
+
+    void checkNearPlaneUpdate()
+    {
+        // GIVEN
+        TestArbiter arbiter;
+        Qt3DRender::QCameraLens cameraLens;
+        arbiter.setArbiterOnNode(&cameraLens);
+
+        {
+            // WHEN
+            cameraLens.setNearPlane(5.0f);
+            QCoreApplication::processEvents();
+
+            // THEN
+            QCOMPARE(arbiter.events.size(), 1);
+            auto change = arbiter.events.first().staticCast<Qt3DCore::QPropertyUpdatedChange>();
+            QCOMPARE(change->propertyName(), "projectionMatrix");
+            QCOMPARE(change->type(), Qt3DCore::PropertyUpdated);
+
+            arbiter.events.clear();
+        }
+
+        {
+            // WHEN
+            cameraLens.setNearPlane(5.0f);
+            QCoreApplication::processEvents();
+
+            // THEN
+            QCOMPARE(arbiter.events.size(), 0);
+        }
+
+    }
+
+    void checkFarPlaneUpdate()
+    {
+        // GIVEN
+        TestArbiter arbiter;
+        Qt3DRender::QCameraLens cameraLens;
+        arbiter.setArbiterOnNode(&cameraLens);
+
+        {
+            // WHEN
+            cameraLens.setFarPlane(5.0f);
+            QCoreApplication::processEvents();
+
+            // THEN
+            QCOMPARE(arbiter.events.size(), 1);
+            auto change = arbiter.events.first().staticCast<Qt3DCore::QPropertyUpdatedChange>();
+            QCOMPARE(change->propertyName(), "projectionMatrix");
+            QCOMPARE(change->type(), Qt3DCore::PropertyUpdated);
+
+            arbiter.events.clear();
+        }
+
+        {
+            // WHEN
+            cameraLens.setFarPlane(5.0f);
+            QCoreApplication::processEvents();
+
+            // THEN
+            QCOMPARE(arbiter.events.size(), 0);
+        }
+
+    }
+
+    void checkFieldOfViewUpdate()
+    {
+        // GIVEN
+        TestArbiter arbiter;
+        Qt3DRender::QCameraLens cameraLens;
+        arbiter.setArbiterOnNode(&cameraLens);
+
+        {
+            // WHEN
+            cameraLens.setFieldOfView(5.0f);
+            QCoreApplication::processEvents();
+
+            // THEN
+            QCOMPARE(arbiter.events.size(), 1);
+            auto change = arbiter.events.first().staticCast<Qt3DCore::QPropertyUpdatedChange>();
+            QCOMPARE(change->propertyName(), "projectionMatrix");
+            QCOMPARE(change->type(), Qt3DCore::PropertyUpdated);
+
+            arbiter.events.clear();
+        }
+
+        {
+            // WHEN
+            cameraLens.setFieldOfView(5.0f);
+            QCoreApplication::processEvents();
+
+            // THEN
+            QCOMPARE(arbiter.events.size(), 0);
+        }
+
+    }
+
+    void checkAspectRatioUpdate()
+    {
+        // GIVEN
+        TestArbiter arbiter;
+        Qt3DRender::QCameraLens cameraLens;
+        arbiter.setArbiterOnNode(&cameraLens);
+
+        {
+            // WHEN
+            cameraLens.setAspectRatio(9.0f);
+            QCoreApplication::processEvents();
+
+            // THEN
+            QCOMPARE(arbiter.events.size(), 1);
+            auto change = arbiter.events.first().staticCast<Qt3DCore::QPropertyUpdatedChange>();
+            QCOMPARE(change->propertyName(), "projectionMatrix");
+            QCOMPARE(change->type(), Qt3DCore::PropertyUpdated);
+
+            arbiter.events.clear();
+        }
+
+        {
+            // WHEN
+            cameraLens.setAspectRatio(9.0f);
+            QCoreApplication::processEvents();
+
+            // THEN
+            QCOMPARE(arbiter.events.size(), 0);
+        }
+
+    }
+
+    void checkLeftUpdate()
+    {
+        // GIVEN
+        TestArbiter arbiter;
+        Qt3DRender::QCameraLens cameraLens;
+        arbiter.setArbiterOnNode(&cameraLens);
+
+        {
+            // WHEN
+            cameraLens.setLeft(0.0f);
+            QCoreApplication::processEvents();
+
+            // THEN
+            QCOMPARE(arbiter.events.size(), 1);
+            auto change = arbiter.events.first().staticCast<Qt3DCore::QPropertyUpdatedChange>();
+            QCOMPARE(change->propertyName(), "projectionMatrix");
+            QCOMPARE(change->type(), Qt3DCore::PropertyUpdated);
+
+            arbiter.events.clear();
+        }
+
+        {
+            // WHEN
+            cameraLens.setLeft(0.0f);
+            QCoreApplication::processEvents();
+
+            // THEN
+            QCOMPARE(arbiter.events.size(), 0);
+        }
+
+    }
+
+    void checkRightUpdate()
+    {
+        // GIVEN
+        TestArbiter arbiter;
+        Qt3DRender::QCameraLens cameraLens;
+        arbiter.setArbiterOnNode(&cameraLens);
+
+        {
+            // WHEN
+            cameraLens.setRight(24.0f);
+            QCoreApplication::processEvents();
+
+            // THEN
+            QCOMPARE(arbiter.events.size(), 1);
+            auto change = arbiter.events.first().staticCast<Qt3DCore::QPropertyUpdatedChange>();
+            QCOMPARE(change->propertyName(), "projectionMatrix");
+            QCOMPARE(change->type(), Qt3DCore::PropertyUpdated);
+
+            arbiter.events.clear();
+        }
+
+        {
+            // WHEN
+            cameraLens.setRight(24.0f);
+            QCoreApplication::processEvents();
+
+            // THEN
+            QCOMPARE(arbiter.events.size(), 0);
+        }
+
+    }
+
+    void checkBottomUpdate()
+    {
+        // GIVEN
+        TestArbiter arbiter;
+        Qt3DRender::QCameraLens cameraLens;
+        arbiter.setArbiterOnNode(&cameraLens);
+
+        {
+            // WHEN
+            cameraLens.setBottom(-12.0f);
+            QCoreApplication::processEvents();
+
+            // THEN
+            QCOMPARE(arbiter.events.size(), 1);
+            auto change = arbiter.events.first().staticCast<Qt3DCore::QPropertyUpdatedChange>();
+            QCOMPARE(change->propertyName(), "projectionMatrix");
+            QCOMPARE(change->type(), Qt3DCore::PropertyUpdated);
+
+            arbiter.events.clear();
+        }
+
+        {
+            // WHEN
+            cameraLens.setBottom(-12.0f);
+            QCoreApplication::processEvents();
+
+            // THEN
+            QCOMPARE(arbiter.events.size(), 0);
+        }
+
+    }
+
+    void checkTopUpdate()
+    {
+        // GIVEN
+        TestArbiter arbiter;
+        Qt3DRender::QCameraLens cameraLens;
+        arbiter.setArbiterOnNode(&cameraLens);
+
+        {
+            // WHEN
+            cameraLens.setTop(12.0f);
+            QCoreApplication::processEvents();
+
+            // THEN
+            QCOMPARE(arbiter.events.size(), 1);
+            auto change = arbiter.events.first().staticCast<Qt3DCore::QPropertyUpdatedChange>();
+            QCOMPARE(change->propertyName(), "projectionMatrix");
+            QCOMPARE(change->type(), Qt3DCore::PropertyUpdated);
+
+            arbiter.events.clear();
+        }
+
+        {
+            // WHEN
+            cameraLens.setTop(12.0f);
+            QCoreApplication::processEvents();
+
+            // THEN
+            QCOMPARE(arbiter.events.size(), 0);
+        }
+
+    }
+
+    void checkProjectionMatrixUpdate()
+    {
+        // GIVEN
+        TestArbiter arbiter;
+        Qt3DRender::QCameraLens cameraLens;
+        arbiter.setArbiterOnNode(&cameraLens);
+
+        QMatrix4x4 m;
+        m.translate(-5.0f, 5.0f, 25.0f);
+
+        {
+            // WHEN
+            cameraLens.setProjectionMatrix(m);
+            QCoreApplication::processEvents();
+
+            // THEN
+            QCOMPARE(arbiter.events.size(), 1);
+            auto change = arbiter.events.first().staticCast<Qt3DCore::QPropertyUpdatedChange>();
+            QCOMPARE(change->propertyName(), "projectionMatrix");
+            QCOMPARE(change->value().value<QMatrix4x4>(), m);
+            QCOMPARE(change->type(), Qt3DCore::PropertyUpdated);
+
+            arbiter.events.clear();
+        }
+
+        {
+            // WHEN
+            cameraLens.setProjectionMatrix(m);
+            QCoreApplication::processEvents();
+
+            // THEN
+            QCOMPARE(arbiter.events.size(), 0);
+        }
+
+    }
+
+};
+
+QTEST_MAIN(tst_QCameraLens)
+
+#include "tst_qcameralens.moc"
diff --git a/tests/auto/render/render.pro b/tests/auto/render/render.pro
index 52270083b..b43ecb166 100644
--- a/tests/auto/render/render.pro
+++ b/tests/auto/render/render.pro
@@ -55,5 +55,6 @@ contains(QT_CONFIG, private_tests) {
         qcuboidgeometry \
         sceneloader \
         qsceneloader \
-        qrendertargetoutput
+        qrendertargetoutput \
+        qcameralens
 }