Tests: add test for attach extension

Create two plane features and map the second on the first plane with map mode 'FlatFace'

tests/src/Mod/Part/App/AttachExtension.cpp

@@ -0,0 +1,56 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
+#include "gtest/gtest.h"
+
+#include <src/App/InitApplication.h>
+#include <App/Document.h>
+#include <Mod/Part/App/PrimitiveFeature.h>
+
+
+class AttachExtensionTest: public ::testing::Test
+{
+protected:
+    static void SetUpTestSuite()
+    {
+        tests::initApplication();
+    }
+
+    void SetUp() override
+    {
+        _docName = App::GetApplication().getUniqueDocumentName("test");
+        _doc = App::GetApplication().newDocument(_docName.c_str(), "testUser");
+    }
+
+    void TearDown() override
+    {
+        App::GetApplication().closeDocument(_docName.c_str());
+    }
+
+    App::Document* getDocument() const
+    {
+        return _doc;
+    }
+
+private:
+    std::string _docName;
+    App::Document* _doc = nullptr;
+};
+
+TEST_F(AttachExtensionTest, testPlanePlane)
+{
+    auto plane1 = dynamic_cast<Part::Plane*>(getDocument()->addObject("Part::Plane", "Plane1"));
+    auto plane2 = dynamic_cast<Part::Plane*>(getDocument()->addObject("Part::Plane", "Plane2"));
+
+    ASSERT_TRUE(plane1);
+    ASSERT_TRUE(plane2);
+
+    getDocument()->recompute();
+
+    plane2->MapReversed.setValue(false);
+    plane2->AttachmentSupport.setValue(plane1);
+    plane2->MapPathParameter.setValue(0.0);
+    plane2->MapMode.setValue("FlatFace");
+
+    getDocument()->recompute();
+    EXPECT_TRUE(true);
+}

tests/src/Mod/Part/App/CMakeLists.txt

@@ -3,6 +3,7 @@ target_sources(
     Part_tests_run
         PRIVATE
             ${CMAKE_CURRENT_SOURCE_DIR}/Attacher.cpp
+            ${CMAKE_CURRENT_SOURCE_DIR}/AttachExtension.cpp
             ${CMAKE_CURRENT_SOURCE_DIR}/BRepMesh.cpp
             ${CMAKE_CURRENT_SOURCE_DIR}/FeatureChamfer.cpp
             ${CMAKE_CURRENT_SOURCE_DIR}/FeatureCompound.cpp