[py] test function creation

python/test/base.py

@@ -11,8 +11,26 @@
 
 import pytest
 from dune.xt.common.test import load_all_submodule
+from dune.xt.grid import types, provider
+import dune.xt.grid as xtg
+import dune.xt.functions as xtf
 
 
 def test_load_all():
     import dune.xt.functions as xtc
     load_all_submodule(xtc)
+
+@pytest.fixture(params=xtg.types.available_types)
+def _grid_provider_factory(request):
+    maker_str='make_cube_grid__{}'
+    fn = maker_str.format(request.param)
+    maker = getattr(xtg.provider, fn)
+    return maker()
+
+
+def test_create_functions(_grid_provider_factory):
+    grid = _grid_provider_factory
+    func = xtf.make_expression_function_1x1(
+        grid, 'x', '1+(cos(0.5*pi*x[0])*cos(0.5*pi*x[1]))', order=2, name='lambda_0')
+    func = xtf.make_constant_function_1x1(grid, 1)
+    func = xtf.make_constant_function_2x1(grid, 1)
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