Tests: add unit test to check OCCT behaviour

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

@@ -20,6 +20,7 @@ target_sources(
             ${CMAKE_CURRENT_SOURCE_DIR}/PartFeatures.cpp
             ${CMAKE_CURRENT_SOURCE_DIR}/PartTestHelpers.cpp
             ${CMAKE_CURRENT_SOURCE_DIR}/PropertyTopoShape.cpp
+            ${CMAKE_CURRENT_SOURCE_DIR}/TopoDS_Shape.cpp
             ${CMAKE_CURRENT_SOURCE_DIR}/TopoShape.cpp
             ${CMAKE_CURRENT_SOURCE_DIR}/TopoShapeCache.cpp
             ${CMAKE_CURRENT_SOURCE_DIR}/TopoShapeExpansion.cpp

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

@@ -0,0 +1,38 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
+#include "gtest/gtest.h"
+#include <BRepBuilderAPI_MakeEdge.hxx>
+#include <Standard_TypeMismatch.hxx>
+#include <TopoDS.hxx>
+#include <TopoDS_Edge.hxx>
+#include <TopoDS_Vertex.hxx>
+
+// NOLINTBEGIN
+// clang-format off
+TEST(TopoDS_Shape, TestCastEdgeToVertex)
+{
+    BRepBuilderAPI_MakeEdge mkEdge(gp_Pnt(0, 0, 0), gp_Pnt(10, 0, 0));
+    TopoDS_Edge edge = mkEdge.Edge();
+    TopoDS_Vertex vertex;
+    EXPECT_THROW(vertex = TopoDS::Vertex(edge), Standard_TypeMismatch);
+    EXPECT_TRUE(vertex.IsNull());
+}
+
+TEST(TopoDS_Shape, TestCastNullVertex)
+{
+    TopoDS_Vertex vertex1;
+    TopoDS_Vertex vertex2;
+    EXPECT_NO_THROW(vertex2 = TopoDS::Vertex(vertex1));
+    EXPECT_TRUE(vertex2.IsNull());
+}
+
+TEST(TopoDS_Shape, TestCastNullEdge)
+{
+    TopoDS_Edge edge;
+    TopoDS_Vertex vertex;
+    EXPECT_NO_THROW(vertex = TopoDS::Vertex(edge));
+    EXPECT_TRUE(vertex.IsNull());
+}
+
+// clang-format on
+// NOLINTEND