Added convergence test for multigrid V-cycle with constant stencils to CMakeLists

tests/pde/CMakeLists.txt

@@ -20,3 +20,6 @@ waLBerla_execute_test( NAME SORShortTest COMMAND $<TARGET_FILE:SORTest> --shortr
 waLBerla_compile_test( FILES MGTest.cpp DEPENDS blockforest timeloop vtk )
 waLBerla_execute_test( NAME MGShortTest COMMAND $<TARGET_FILE:MGTest> --shortrun PROCESSES 8 )
 waLBerla_execute_test( NAME MGTest COMMAND $<TARGET_FILE:MGTest> PROCESSES 8 CONFIGURATIONS Release RelWithDbgInfo )
+
+waLBerla_compile_test( FILES MGConvergenceTest.cpp DEPENDS blockforest timeloop vtk )
+waLBerla_execute_test( NAME MGConvergenceTest COMMAND $<TARGET_FILE:MGConvergenceTest> PROCESSES 8 CONFIGURATIONS Release RelWithDbgInfo )
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