test: fix timestamp verification in system test #1202
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Currently, the
test_batch_insert_then_read_all_datatypes
andtest_execute_sql_w_timestamp_bindings
tests fail when run outside of the UTC timezone. This is frustrating when running tests locally for those who are based in a different timezone.This PR moves the handling of the timezones to
_assert_timestamp
. All datetime objects created without a timezone are assumed to be in local time. By asserting that it does not have a timezone first, we can safely convert it to UTC which should match the value returned from Spanner.