class_docstr: Test the functionality provided by vcf.InMemoryVcfReader.
docstr: Tests that the reader provides us back the header we gave it.
docstr_tok: ["Tests","that","the","reader","provides","us","back","the","header","we","gave","it","."]
code: def test_header(self):
      """Tests that the reader provides us back the header we gave it."""
      self.assertEqual(self.reader.header, self.header)
  
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 vcf
  from third_party.nucleus.protos import reference_pb2
  from third_party.nucleus.protos import struct_pb2
  from third_party.nucleus.protos import variants_pb2
  from third_party.nucleus.testing import test_utils
  from third_party.nucleus.util import ranges
label_desc: Use image node_id 3 for calling the InMemoryVcfReaderTests obj's underlying member method code with example usage: obj.test_header() without return types