def test_precision_exceeds_64bit():
 t1 = Time(123456789000.0, format='cxcsec')
 t2 = (t1 + dt_tiny)
 assert (t1.jd == t2.jd)

def test_precision_exceeds_64bit ( ) : t1 = Time ( 123456789000.0 , format = 'cxcsec' ) t2 = ( t1 + dt_tiny ) assert ( t1 . jd == t2 . jd )
check that time object really holds more precision than float64 by looking at the summed 64-bit result and asserting equality at the bit level .