feat: Add UT for BehindWindowBlur

  Add UT.

tests/CMakeLists.txt

@@ -31,6 +31,7 @@ file(GLOB TEST_SOURCES
     ut_dquickdciicon.cpp
     ut_dblurimagenode.cpp
     ut_dhandlecontextmenuwindow.cpp
+    ut_dquickbehindwindowblur.cpp
 )
 if (EnableDtk5)
     list(APPEND TEST_SOURCES

tests/data.qrc

@@ -27,5 +27,6 @@
         <file>qml/DMaskEffectNode_TextureMaterial.qml</file>
         <file>qml/DSGBlurImageNode.qml</file>
         <file>qml/ContextMenuWindow.qml</file>
+        <file>qml/DQuickBehindWindowBlur.qml</file>
     </qresource>
 </RCC>

tests/qml/DQuickBehindWindowBlur.qml

@@ -0,0 +1,29 @@
+// SPDX-FileCopyrightText: 2023 UnionTech Software Technology Co., Ltd.
+//
+// SPDX-License-Identifier: LGPL-3.0-or-later
+
+import QtQuick 2.11
+import QtQuick.Window 2.11
+import org.deepin.dtk 1.0 as D
+
+Rectangle {
+    id: control
+    width: 200; height: 200
+    color: "red"
+    Window {
+        // on top of the Rectangle's window
+        x: control.Window.window ? control.Window.window.x : 0
+        y: control.Window.window ? control.Window.window.y : 0
+        width: 100; height: 100
+        visible: true
+
+        D.DWindow.enabled: true
+        D.DWindow.alphaBufferSize: 8
+
+        D.BehindWindowBlur {
+            anchors.fill: parent
+            blendColor: Qt.rgba(0, 255, 0, 0.4)
+            cornerRadius: 10
+        }
+    }
+}

tests/ut_dquickbehindwindowblur.cpp

@@ -0,0 +1,31 @@
+// SPDX-FileCopyrightText: 2023 UnionTech Software Technology Co., Ltd.
+//
+// SPDX-License-Identifier: LGPL-3.0-or-later
+
+#include <gtest/gtest.h>
+
+#include "test_helper.hpp"
+
+#include <QQuickItem>
+
+#include "dquickbehindwindowblur_p.h"
+DQUICK_USE_NAMESPACE
+
+TEST(ut_DQuickBehindWindowBlur, properties)
+{
+    QuickViewHelper<> helper("qrc:/qml/DQuickBehindWindowBlur.qml");
+    ASSERT_TRUE(helper.object);
+
+    DQuickBehindWindowBlur *target = helper.object->findChild<DQuickBehindWindowBlur *>();
+    ASSERT_TRUE(target);
+
+    if (!target->valid())
+        GTEST_SKIP_("don't support BehindWindowBlur, it need WM support.");
+
+    EXPECT_EQ(target->blendColor(), QColor(0, 255, 0, 0.4 * 255));
+    EXPECT_EQ(target->cornerRadius(), 10);
+
+    QImage img = helper.view->grabWindow();
+    EXPECT_NE(img.pixelColor(QPoint(50, 50)), QColor(0, 255, 0, 0.4));
+    EXPECT_EQ(img.pixelColor(QPoint(150, 50)), Qt::red);
+}