class_docstr: Test the functionality of tabix.build_index.
class_docstr_tok: ["Test","the","functionality","of","tabix.build_index","."]
code: def setUp(self):
      super(TabixTest, self).setUp()
      self.input_file = test_utils.genomics_core_testdata(
          "test_samples.vcf.gz"
      )
      self.output_file = test_utils.test_tmpfile("test_samples.vcf.gz")
      shutil.copyfile(self.input_file, self.output_file)
      self.tbx_index_file = self.output_file + ".tbi"
      self.csi_index_file = self.output_file + ".csi"
  
file_path: deepvariant/third_party/nucleus/io/tabix_test.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  import shutil
  from absl.testing import absltest
  from etils import epath
  from third_party.nucleus.io import tabix
  from third_party.nucleus.io import vcf
  from third_party.nucleus.testing import test_utils
  from third_party.nucleus.util import ranges
label_desc: Use image node_id 1 for calling the TabixTest obj's underlying member method code with example usage: obj.setUp() without return types