walberla coupling modules are tested as well

lbmpy_tests/test_boundary_indexlist_creation.py

@@ -37,3 +37,39 @@ def test_equivalence_cython_python_version():
 
         np.testing.assert_equal(result_python_2d, result_cython_2d)
         np.testing.assert_equal(result_python_3d, result_cython_3d)
+
+
+def test_equivalence_cell_idx_list_cython_python_version():
+    if not cil.cython_funcs_available:
+        return
+
+    stencil_2d = get_stencil("D2Q9")
+    stencil_3d = get_stencil("D3Q19")
+
+    for dtype in [int, np.int16, np.uint32]:
+        fluid_mask = dtype(1)
+        mask = dtype(2)
+        flag_field_2d = np.ones([15, 16], dtype=dtype) * fluid_mask
+        flag_field_3d = np.ones([15, 16, 17], dtype=dtype) * fluid_mask
+
+        flag_field_2d[0, :] = mask
+        flag_field_2d[-1, :] = mask
+        flag_field_2d[7, 7] = mask
+
+        flag_field_3d[0, :, :] = mask
+        flag_field_3d[-1, :, :] = mask
+        flag_field_3d[7, 7, 7] = mask
+
+        result_python_2d = cil._create_boundary_cell_index_list_python(flag_field_2d, mask, fluid_mask,
+                                                                       stencil_2d, False)
+
+        result_python_3d = cil._create_boundary_cell_index_list_python(flag_field_3d, mask, fluid_mask,
+                                                                       stencil_3d, False)
+
+        result_cython_2d = cil.create_boundary_index_list(flag_field_2d, stencil_2d, mask, fluid_mask, None,
+                                                          False, False)
+        result_cython_3d = cil.create_boundary_index_list(flag_field_3d, stencil_3d, mask, fluid_mask, None,
+                                                          False, False)
+
+        np.testing.assert_equal(result_python_2d, result_cython_2d)
+        np.testing.assert_equal(result_python_3d, result_cython_3d)