code: def test_known_contig(self):
      for contig in self.fasta_reader.header.contigs:
          self.assertContigsAreEqual(
              self.in_mem.contig(contig.name), contig
          )
  
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
  import six
  from third_party.nucleus.io import fasta
  from third_party.nucleus.io.python import reference
  from third_party.nucleus.testing import test_utils
  from third_party.nucleus.util import ranges
label_desc: Use image node_id 9 for calling the InMemoryFastaReaderTests obj's underlying member method code with example usage: obj.test_known_contig() without return types