feat: Add UT for DWaterMarkWidget

  Add UT.

tests/CMakeLists.txt

@@ -112,6 +112,7 @@ set(WIDGET_TEST
     testcases/widgets/ut_dwindowoptionbutton.cpp
     testcases/widgets/ut_dwindowquitfullbutton.cpp
     testcases/widgets/ut_dcombobox.cpp
+    testcases/widgets/ut_dwatermarkwidget.cpp
 )
 
 include(${PROJECT_SOURCE_DIR}/src/util/util.cmake)

tests/data.qrc

@@ -3,5 +3,7 @@
         <file>data/titlebar-settings.json</file>
         <file>data/example-license.json</file>
         <file>data/test.png</file>
+        <file>data/watermarks/text.png</file>
+        <file>data/watermarks/image.png</file>
     </qresource>
 </RCC>

tests/testcases/widgets/ut_dwatermarkwidget.cpp

@@ -0,0 +1,68 @@
+// SPDX-FileCopyrightText: 2023 UnionTech Software Technology Co., Ltd.
+//
+// SPDX-License-Identifier: LGPL-3.0-or-later
+
+#include <gtest/gtest.h>
+#include <QLabel>
+#include <QTest>
+
+#include "dwatermarkwidget.h"
+DWIDGET_USE_NAMESPACE
+class ut_DWaterMarkWidget : public testing::Test
+{
+protected:
+    void SetUp() override
+    {
+        root = new QLabel();
+        target = new DWaterMarkWidget(root);
+        root->resize(600, 600);
+
+        QImage img(":/data/test.png");
+        QPixmap pixmap = QPixmap::fromImage(img.scaled(root->size()));
+        root->setPixmap(pixmap);
+    }
+    void TearDown() override
+    {
+        if (root)
+            delete root;
+    }
+    inline bool equalImage(const QImage &source)
+    {
+        QPixmap result = root->grab();
+        return result.toImage() == source;
+    }
+
+    DWaterMarkWidget *target = nullptr;
+    QLabel *root = nullptr;
+};
+
+TEST_F(ut_DWaterMarkWidget, paintText)
+{
+    WaterMarkData data = target->data();
+    data.setType(WaterMarkData::Text);
+    data.setText("deepin water mark");
+    data.setLineSpacing(200);
+    data.setScaleFactor(1.5);
+    auto font = data.font();
+    font.setBold(true);
+    font.setPointSize(20);
+    data.setFont(font);
+    data.setColor(Qt::red);
+    data.setOpacity(0.5);
+    target->setData(data);
+
+    EXPECT_TRUE(equalImage(QImage(":/data/watermarks/text.png")));
+}
+
+TEST_F(ut_DWaterMarkWidget, paintImage)
+{
+    WaterMarkData data = target->data();
+    data.setType(WaterMarkData::Image);
+    QImage img(":/assets/images/uos.svg");
+    data.setImage(img);
+    data.setLineSpacing(200);
+    data.setGrayScale(true);
+    target->setData(data);
+
+    EXPECT_TRUE(equalImage(QImage(":/data/watermarks/image.png")));
+}