message: Fixed int type
diff: @@ -48,7 +48,7 @@ TEST_F(ADIOSHierarchicalReadVariableTest, Read)
  io.AddTransport("file");
  adios2::Engine engine = io.Open(filename, adios2::Mode::Write);
  - const int Nx = 10;
  + const size_t Nx = 10;
  const adios2::Dims shape = {size * Nx};
  const adios2::Dims start = {rank * Nx};
  const adios2::Dims count = {Nx};
  