code: def test_from_file_raises_with_missing_bam(self):
      # TODO: OpError exception not propagated.
      with self.assertRaisesRegex(
          ValueError, "Could not open missing.bam"
      ):
          sam_reader.SamReader.from_file(
              reads_path="missing.bam",
              ref_path="",
              options=self.options,
          )
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from absl.testing import absltest
  from absl.testing import parameterized
  from third_party.nucleus.io import clif_postproc
  from third_party.nucleus.io.python import sam_reader
  from third_party.nucleus.protos import reads_pb2
  from third_party.nucleus.protos import reference_pb2
  from third_party.nucleus.testing import test_utils
  from third_party.nucleus.util import ranges
label_desc: Use image node_id 7 for calling the SamReaderTest obj's underlying member method code with example usage: obj.test_from_file_raises_with_missing_bam() without return types