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from superset.db_engine_specs.postgres import PostgresBaseEngineSpec
from superset.db_engine_specs.timescaledb import TimescaleDBEngineSpec


def test_timescaledb_inherits_from_postgres_base() -> None:
    assert issubclass(TimescaleDBEngineSpec, PostgresBaseEngineSpec)


def test_timescaledb_inherits_extended_aggregations() -> None:
    """
    TimescaleDB is a Postgres extension, not a forked query engine -- it runs
    unmodified Postgres aggregate execution -- so it inherits
    `_extended_aggregations` from `PostgresBaseEngineSpec` unmodified -- see
    the comment above that dict.
    """
    assert TimescaleDBEngineSpec.get_extended_aggregation_func("MEDIAN") is not None
    assert (
        TimescaleDBEngineSpec.get_extended_aggregation_func("STDDEV_SAMP") is not None
    )
    assert TimescaleDBEngineSpec.get_extended_aggregation_func("VAR_SAMP") is not None