code: def test_context_manager(self):
      with self.writer:
          # Writing within the context manager succeeds.
          self.assertIsNone(self.writer.write(self.record))
  
      # self.writer should be closed, so writing again will fail.
      with self.assertRaisesRegexp(ValueError, _WRITE_TO_CLOSED_ERROR):
          self.writer.write(self.record)
  
file_path: deepvariant/third_party/nucleus/io/python/fastq_writer_wrap_test.py
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 etils import epath
  from third_party.nucleus.io import fastq
  from third_party.nucleus.io import tfrecord
  from third_party.nucleus.io.python import fastq_writer
  from third_party.nucleus.protos import fastq_pb2
  from third_party.nucleus.testing import test_utils
label_desc: Use image node_id 3 for calling the WrapFastqWriterTest obj's underlying member method code with example usage: obj.test_context_manager() without return types