def METHOD_NAME(dummy_event, dummy_user):
    dummy_event.start_dt = as_utc(datetime(2017, 11, 27, 8, 0, 0))
    dummy_event.end_dt = as_utc(datetime(2017, 11, 27, 12, 0, 0))
    csv = b'\n'.join([b'2017-11-27T08:00,10,First contribution,,,,',
                      b',,Second contribution,John,Doe,ACME Inc.,jdoe@example.test',
                      b'2017-11-27T08:30,15,Third contribution,Guinea Albert,Pig,,1337@example.test'])
    contributions, changes = import_contributions_from_csv(dummy_event, BytesIO(csv))
    assert len(contributions) == 3
    assert contributions[0].start_dt == dummy_event.start_dt
    assert contributions[0].duration == timedelta(minutes=10)
    assert contributions[0].title == 'First contribution'
    assert len(contributions[0].speakers) == 0
    assert contributions[1].start_dt is None
    assert contributions[1].duration == timedelta(minutes=20)
    assert contributions[1].title == 'Second contribution'
    speakers = contributions[1].speakers
    assert len(speakers) == 1
    assert speakers[0].full_name == 'John Doe'
    assert speakers[0].affiliation == 'ACME Inc.'
    assert speakers[0].email == 'jdoe@example.test'
    assert contributions[2].start_dt == as_utc(datetime(2017, 11, 27, 8, 30, 0))
    assert contributions[2].duration == timedelta(minutes=15)
    assert contributions[2].title == 'Third contribution'
    speakers = contributions[2].speakers
    assert len(speakers) == 1
    # name comes from PersonLink, not user
    assert speakers[0].full_name == 'Guinea Albert Pig'
    assert not speakers[0].affiliation
    assert speakers[0].email == '1337@example.test'
    assert speakers[0].person.user == dummy_user
    assert not changes