Adjust the poisson (convergence) test to the command syntax

dune/pdelab-systemtesting/poisson/CMakeLists.txt

-add_dune_system_test(BASENAME poisson INIFILE poisson.mini SOURCE poisson_uniform.cc TARGETS output SCRIPT ${DUNE_TESTTOOLS_PATH}/python/wrapper/vtkcompare.py)
+add_dune_system_test(BASENAME poisson INIFILE poisson.mini SOURCE poisson_uniform.cc TARGETS output) #SCRIPT ${DUNE_TESTTOOLS_PATH}/python/wrapper/vtkcompare.py)
 
 # The following block is supposed to vanish as soon as FS1557 is through!
 foreach(target ${output})
@@ -10,5 +10,7 @@ endforeach()
 
 # reuse the existing executables for a convergence test.
 # try picking only one static variation for the convergence test
-list(GET output 0 conv_target)
-add_dune_convergence_test(BASENAME poisson TARGET ${conv_target} INIFILE poisson_conv.mini)
\ No newline at end of file
+#list(GET output 0 conv_target)
+#add_dune_convergence_test(BASENAME poisson TARGET ${conv_target} INIFILE poisson_conv.mini)
+
+add_dune_convergence_test(BASENAME poisson TARGET ${output} INIFILE poisson_conv.mini)

dune/pdelab-systemtesting/poisson/poisson_conv.mini

@@ -3,17 +3,17 @@ dim = 2
 grid = yasp, ug | expand grid
 degree = 1, 2 | expand deg
 naming = {grid}_{dim}d_Q{degree}
-level =  1,2,3,4,5 | expand
+level =  1,2,3,4,5 | convergence_test
 
 # The suffix for the executable
 __exec_suffix = {naming}
 __name = {naming}_lev{level}
 
-outputFile = poisson_conv_{__name}.output
+outputFile = {__name}.output
 computeError = true
 
 [vtk]
-output = False
+vtk.output = False
 name = poisson_{naming}
 
 [yaspgrid]
@@ -32,6 +32,5 @@ GRIDTYPE = Dune::YaspGrid<{dim}>, Dune::UGGrid<{dim}> | expand grid
 DEGREE = {degree}
 
 [__CONVERGENCE_TEST]
-TestKey = level
-ExpectedRate = 2, 3 | expand degree
-AbsoluteDiff = 0.1
\ No newline at end of file
+ExpectedRate = 2, 3 | expand deg
+AbsoluteDiff = 0.1