Disable std::cout to prevent polluting of test reports

tests/mpi_test_main.cpp

@@ -12,6 +12,9 @@ main(int argc, char* argv[])
   parallel::Messenger::create(argc, argv);
   Kokkos::initialize({4, -1, -1, true});
 
+  // Disable outputs from tested classes to the standard output
+  std::cout.setstate(std::ios::badbit);
+
   if (parallel::rank() != 0) {
     setenv("GCOV_PREFIX", "/dev/null", 1);
   }

tests/test_main.cpp

@@ -8,6 +8,9 @@ main(int argc, char* argv[])
 {
   Kokkos::initialize({4, -1, -1, true});
 
+  // Disable outputs from tested classes to the standard output
+  std::cout.setstate(std::ios::badbit);
+
   int result = Catch::Session().run(argc, argv);
 
   Kokkos::finalize();