feat: add UT for ButtonBox

Log:

tests/CMakeLists.txt

@@ -17,6 +17,7 @@ file(GLOB TEST_SOURCES
     ut_waterprogressbar.cpp
     ut_keysequencelistener.cpp
     ut_dsettingscontainer.cpp
+    ut_buttonbox.cpp
     ut_dobjectmodelproxy.cpp
     ut_dmessagemanager.cpp
 )

tests/data.qrc

@@ -13,5 +13,6 @@
         <file>qml/SettingsContainer_View.qml</file>
         <file>qml/ObjectModelProxy.qml</file>
         <file>qml/MessageManager.qml</file>
+        <file>qml/ButtonBox.qml</file>
     </qresource>
 </RCC>

tests/qml/ButtonBox.qml

@@ -0,0 +1,17 @@
+// SPDX-FileCopyrightText: 2023 UnionTech Software Technology Co., Ltd.
+//
+// SPDX-License-Identifier: LGPL-3.0-or-later
+
+import QtQuick 2.11
+import QtQuick.Controls 2.11
+import org.deepin.dtk 1.0 as D
+
+D.ButtonBox {
+    ToolButton {
+        text: "Button1"
+        checked: true
+    }
+    ToolButton {
+        text: "Button2"
+    }
+}

tests/ut_buttonbox.cpp

@@ -0,0 +1,19 @@
+// SPDX-FileCopyrightText: 2023 UnionTech Software Technology Co., Ltd.
+//
+// SPDX-License-Identifier: LGPL-3.0-or-later
+
+#include <gtest/gtest.h>
+#include "test_helper.hpp"
+
+class ut_ButtonBox : public ::testing::Test
+{
+public:
+};
+
+TEST_F(ut_ButtonBox, properties)
+{
+    ControlHelper<> helper("qrc:/qml/ButtonBox.qml");
+    ASSERT_TRUE(helper.object);
+    QQmlListReference buttons(helper.object, "buttons");
+    ASSERT_EQ(buttons.count(), 2);
+}