[test] Extend test of MutliTypeBlockMatrix::mv, umv, mmv, usmv

Test with non-zero matrix and print results

dune/istl/test/multitypeblockmatrixtest.cc

@@ -71,10 +71,22 @@ int main(int argc, char** argv) try
   result[_0].resize(3);
   result[_1].resize(2);
 
+  multiMatrix[_0][_0] = 4200;
+  multiMatrix[_0][_1] = 4201;
+  multiMatrix[_1][_0] = 4210;
+  multiMatrix[_1][_1] = 4211;
+
   multiMatrix.mv(multiVector,result);
+  std::cout << "mv result" << std::endl << result << std::endl;
+
   multiMatrix.umv(multiVector,result);
+  std::cout << "umv result" << std::endl << result << std::endl;
+
   multiMatrix.mmv(multiVector,result);
+  std::cout << "mmv result" << std::endl << result << std::endl;
+
   multiMatrix.usmv(3.14,multiVector,result);
+  std::cout << "usmv result" << std::endl << result << std::endl;
 
   ///////////////////////////////////////////////////////////////////////////////////////////////////////////
   //  Next test: Set up a linear system with a matrix consisting of 2x2 sparse scalar matrices.