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  """Tests for third_party.nucleus.io.bedgraph."""
  
  from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import sys
  if 'google' in sys.modules and 'google.protobuf' not in sys.modules:
    del sys.modules['google']
  
  
  from absl.testing import absltest
  from absl.testing import parameterized
  
  from third_party.nucleus.io import bedgraph
  from third_party.nucleus.protos import bedgraph_pb2
  from third_party.nucleus.testing import test_utils
  
  
  class BedGraphTests(parameterized.TestCase):
  
    @parameterized.parameters('test_regions.bedgraph', 'test_regions.bedgraph.gz')
    def test_iterate_bedgraph_reader(self, bedgraph_path):
      bedgraph_path = test_utils.genomics_core_testdata(bedgraph_path)
      expected = [('chr1', 10, 20, 100), ('chr1', 100, 200, 250),
                  ('chr1', 300, 400, 150.1), ('chr1', 500, 501, 20.13)]
      with bedgraph.BedGraphReader(bedgraph_path) as reader:
        records = list(reader.iterate())
      self.assertLen(records, 4)
      self.assertEqual(
          [(r.reference_name, r.start, r.end, r.data_value) for r in records],
          expected)
  
    @parameterized.parameters('test_regions.bedgraph', 'test_regions.bedgraph.gz')
    def test_roundtrip_writer(self, bedgraph_path):
      output_path = test_utils.test_tmpfile(bedgraph_path)
      input_path = test_utils.genomics_core_testdata(bedgraph_path)
      records = []
      with bedgraph.BedGraphReader(input_path) as reader:
        records = list(reader.iterate())
  
      with bedgraph.BedGraphWriter(output_path) as writer:
        for record in records:
          writer.write(record)
  
      with bedgraph.BedGraphReader(output_path) as reader:
        v2_records = list(reader.iterate())
  
      self.assertLen(records, 4)
      self.assertEqual(records, v2_records)
  
  
  if __name__ == '__main__':
    absltest.main()
  