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import unittest
from io import StringIO
from rdflib.plugins.sparql.results.tsvresults import TSVResultParser
class TestTSVResults(unittest.TestCase):
def test_empty_tsvresults_bindings(self):
# check that optional bindings are ordered properly
source = """?s\t?p\t?o
\t<urn:p>\t<urn:o>
<urn:s>\t\t<urn:o>
<urn:s>\t<urn:p>\t"""
parser = TSVResultParser()
source = StringIO(source)
result = parser.parse(source)
for idx, row in enumerate(result):
self.assertTrue(row[idx] is None)
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