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from rdflib import Dataset
from test.data import TEST_DATA_DIR
def test_dataset_default_serialize_format_trig():
ds = Dataset()
ds.parse(source=TEST_DATA_DIR / "nquads.rdflib" / "test5.nquads", format="nquads")
statements_count = len(ds)
assert statements_count
# Previously, when the default format is 'turtle', given that the dataset has no
# statements in the default graph, the output of serialize() was empty.
output = ds.serialize().strip()
assert output != ""
ds2 = Dataset()
ds2.parse(data=output, format="trig")
assert len(ds2) == statements_count
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