Get value_shape from function spaces (#231)

Closes #230. Related to
mesh-adaptation/animate#158

test_adjoint/test_mesh_seq.py

@@ -431,11 +431,13 @@ def test_h_enrichment_space(self, family, degree, rank):
         mesh_seq_e = mesh_seq.get_enriched_mesh_seq(
             enrichment_method="h", num_enrichments=1
         )
-        element = mesh_seq.function_spaces[self.field][0].ufl_element()
-        enriched_element = mesh_seq_e.function_spaces[self.field][0].ufl_element()
+        fspace = mesh_seq.function_spaces[self.field][0]
+        element = fspace.ufl_element()
+        enriched_fspace = mesh_seq_e.function_spaces[self.field][0]
+        enriched_element = enriched_fspace.ufl_element()
         self.assertEqual(element.family(), enriched_element.family())
         self.assertEqual(element.degree(), enriched_element.degree())
-        self.assertEqual(element.value_shape, enriched_element.value_shape)
+        self.assertEqual(fspace.value_shape, enriched_fspace.value_shape)
 
     def test_p_enrichment_mesh(self):
         mesh_seq = self.go_mesh_seq(self.get_function_spaces_decorator("CG", 1, 0))
@@ -468,11 +470,13 @@ def test_p_enrichment_space(self, family, degree, rank, num_enrichments):
         mesh_seq_e = mesh_seq.get_enriched_mesh_seq(
             enrichment_method="p", num_enrichments=num_enrichments
         )
-        element = mesh_seq.function_spaces[self.field][0].ufl_element()
-        enriched_element = mesh_seq_e.function_spaces[self.field][0].ufl_element()
+        fspace = mesh_seq.function_spaces[self.field][0]
+        element = fspace.ufl_element()
+        enriched_fspace = mesh_seq_e.function_spaces[self.field][0]
+        enriched_element = enriched_fspace.ufl_element()
         self.assertEqual(element.family(), enriched_element.family())
         self.assertEqual(element.degree() + num_enrichments, enriched_element.degree())
-        self.assertEqual(element.value_shape, enriched_element.value_shape)
+        self.assertEqual(fspace.value_shape, enriched_fspace.value_shape)
 
     @parameterized.expand(
         [