Introduce a sumfactorization mass matrix test

and use it as the only sumfact test until it works.

test/sumfact/CMakeLists.txt

+add_subdirectory(mass)
 add_subdirectory(poisson)

test/sumfact/mass/CMakeLists.txt

+# A mass matrix test: Simplest possible example
+dune_add_formcompiler_system_test(UFLFILE mass.ufl
+                                  BASENAME sumfact_mass
+                                  INIFILE mass.mini
+                                  )

test/sumfact/mass/mass.mini

+__name = sumfact_mass_{__exec_suffix}
+__exec_suffix = numdiff, symdiff | expand num
+
+cells = 1 1
+extension = 1. 1.
+
+[wrapper.vtkcompare]
+name = {__name}
+extension = vtu
+
+[formcompiler]
+numerical_jacobian = 1, 0 | expand num
+sumfact = 1

test/sumfact/mass/mass.ufl

+cell = "quadrilateral"
+
+V = FiniteElement("DG", cell, 1)
+
+u = TrialFunction(V)
+v = TestFunction(V)
+
+r = u * v * dx
+
+forms = [r]

test/sumfact/poisson/CMakeLists.txt

@@ -3,9 +3,9 @@
 #                                   BASENAME sumfact_poisson
 #                                   INIFILE poisson.mini
 #                                   )
-
-# 2. Poisson Test Case: DG, f + pure dirichlet
-dune_add_formcompiler_system_test(UFLFILE poisson_dg.ufl
-                                  BASENAME sumfact_poisson_dg
-                                  INIFILE poisson_dg.mini
-                                  )
+#
+# # 2. Poisson Test Case: DG, f + pure dirichlet
+#dune_add_formcompiler_system_test(UFLFILE poisson_dg.ufl
+#                                  BASENAME sumfact_poisson_dg
+#                                  INIFILE poisson_dg.mini
+#                                  )