def test_time_range():
rows = [{'Start Time': parse_time("2020/01/01"), 'End Time': parse_time("2020/01/02")},
{'Start Time': parse_time("2019/01/01"), 'End Time': parse_time("2019/01/02")}]
resp = QueryResponse(rows)
assert resp.time_range().start == parse_time("2019/01/01")
assert resp.time_range().end == parse_time("2020/01/02")
def test_missing_time_range():
rows = [{'wibble': 1}]
resp = QueryResponse(rows)
assert resp.time_range() is None