message: fix test BPWriteFlushRead() that loops forever in BeginStep for an unclosed file
diff: @@ -276,7 +276,8 @@ TEST_F(BPWriteFlushRead, ADIOS2BPWrite1D2D)
  unsigned int t = 0;
  - while (bpReader.BeginStep() == adios2::StepStatus::OK)
  + while (bpReader.BeginStep(adios2::StepMode::Read, 0.0) ==
  + adios2::StepStatus::OK)
  {
  const size_t currentStep = bpReader.CurrentStep();
  EXPECT_EQ(currentStep, static_cast<size_t>(t));
  @@ -438,7 +439,8 @@ TEST_F(BPWriteFlushRead, ADIOS2BPWrite1D2D)
  unsigned int t = 0;
  - while (bpReader.BeginStep() == adios2::StepStatus::OK)
  + while (bpReader.BeginStep(adios2::StepMode::Read, 0.0) ==
  + adios2::StepStatus::OK)
  {
  const size_t currentStep = bpReader.CurrentStep();
  EXPECT_EQ(currentStep, static_cast<size_t>(t));
  @@ -743,7 +745,8 @@ TEST_F(BPWriteFlushRead, ADIOS2BPWrite1D2Dstdio)
  unsigned int t = 0;
  - while (bpReader.BeginStep() == adios2::StepStatus::OK)
  + while (bpReader.BeginStep(adios2::StepMode::Read, 0.0) ==
  + adios2::StepStatus::OK)
  {
  const size_t currentStep = bpReader.CurrentStep();
  EXPECT_EQ(currentStep, static_cast<size_t>(t));
  @@ -906,7 +909,8 @@ TEST_F(BPWriteFlushRead, ADIOS2BPWrite1D2Dstdio)
  unsigned int t = 0;
  - while (bpReader.BeginStep() == adios2::StepStatus::OK)
  + while (bpReader.BeginStep(adios2::StepMode::Read, 0.0) ==
  + adios2::StepStatus::OK)
  {
  const size_t currentStep = bpReader.CurrentStep();
  EXPECT_EQ(currentStep, static_cast<size_t>(t));
  @@ -1211,7 +1215,8 @@ TEST_F(BPWriteFlushRead, ADIOS2BPWrite1D2Dfstream)
  unsigned int t = 0;
  - while (bpReader.BeginStep() == adios2::StepStatus::OK)
  + while (bpReader.BeginStep(adios2::StepMode::Read, 0.0) ==
  + adios2::StepStatus::OK)
  {
  const size_t currentStep = bpReader.CurrentStep();
  EXPECT_EQ(currentStep, static_cast<size_t>(t));
  @@ -1374,7 +1379,8 @@ TEST_F(BPWriteFlushRead, ADIOS2BPWrite1D2Dfstream)
  unsigned int t = 0;
  - while (bpReader.BeginStep() == adios2::StepStatus::OK)
  + while (bpReader.BeginStep(adios2::StepMode::Read, 0.0) ==
  + adios2::StepStatus::OK)
  {
  const size_t currentStep = bpReader.CurrentStep();
  EXPECT_EQ(currentStep, static_cast<size_t>(t));
  