def METHOD_NAME(self, small_sd_fixture):
    ancestors = tsinfer.generate_ancestors(
        small_sd_fixture, record_provenance=False
    )
    anc_ts = tsinfer.match_ancestors(
        small_sd_fixture, ancestors, record_provenance=False
    )
    ts = tsinfer.match_samples(small_sd_fixture, anc_ts, record_provenance=False)
    assert ts.num_provenances == small_sd_fixture.num_provenances