[test][python] Add a test for the grid geometry Python bindings

test/CMakeLists.txt

@@ -10,3 +10,8 @@ add_subdirectory(multidomain)
 add_subdirectory(nonlinear)
 add_subdirectory(porousmediumflow)
 add_subdirectory(discretization)
+
+# if Python bindings are enabled, include Python binding tests
+if(DUNE_ENABLE_PYTHONBINDINGS)
+  add_subdirectory(python)
+endif()

test/python/CMakeLists.txt

+dune_python_add_test(NAME test_py_gridgeometry
+                     COMMAND ${PYTHON_EXECUTABLE} test_py_gridgeometry.py
+                     WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+                     LABELS python unit)

test/python/test_py_gridgeometry.py

+#!/usr/bin/env python3
+
+from dune.grid import structuredGrid
+from dumux.discretization import GridGeometry
+
+gridView = structuredGrid([0,0],[1,1],[5,5])
+
+gridGeometry = GridGeometry(gridView, discMethod="cctpfa")
+gridGeometry.update()
+
+print("The total number of scvs is {}".format(gridGeometry.numScv()))
+print("The total number of scvfs is {}".format(gridGeometry.numScvf()))
+
+for e in gridView.elements:
+    fvGeometry = gridGeometry.localView()
+    fvGeometry.bind(e)
+
+    for scv in fvGeometry.scvs():
+        print("scv dofIndex: {}".format(scv.dofIndex()))
+        print("scv center: {}".format(scv.center()))
+        print("scv volume: {}".format(scv.volume()))