def METHOD_NAME():
    """Tests for #1263 demonstrating how g0 constant should behave."""
    from astropy.constants.astropyconst13 import g0
    # g0 is an exactly defined constant, so it shouldn't be changing
    assert g0.value == 9.80665  # default is S.I.
    assert g0.si.value == 9.80665
    assert g0.cgs.value == 9.80665e2
    # make sure it has the necessary attributes and they're not blank
    assert g0.uncertainty == 0  # g0 is a *defined* quantity
    assert g0.name
    assert g0.reference
    assert g0.unit
    # Check that its unit have the correct physical type
    assert g0.unit.physical_type == "acceleration"