Prevent hdf5 file locking during tests

tests/mpi_test_main.cpp

@@ -52,6 +52,9 @@ main(int argc, char* argv[])
   Catch::Session session;
   int result = session.applyCommandLine(argc, argv);
 
+  // disable file locking to avoid mess in tests
+  setenv("HDF5_USE_FILE_LOCKING", "FALSE", 1);
+
   if (result == 0) {
     const auto& config = session.config();
     if (config.listReporters() or config.listTags() or config.listTests()) {

tests/test_main.cpp

@@ -33,6 +33,9 @@ main(int argc, char* argv[])
     Kokkos::initialize(args);
   }
 
+  // disable file locking to avoid mess in tests
+  setenv("HDF5_USE_FILE_LOCKING", "FALSE", 1);
+
   PETScWrapper::initialize(argc, argv);
   SLEPcWrapper::initialize(argc, argv);