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"""
Test machar. Given recent changes to hardcode type data, we might want to get
rid of both MachAr and this test at some point.
"""
from numpy.core._machar import MachAr
import numpy.core.numerictypes as ntypes
from numpy import errstate, array
class TestMachAr:
def _run_machar_highprec(self):
# Instantiate MachAr instance with high enough precision to cause
# underflow
try:
hiprec = ntypes.float96
MachAr(lambda v: array(v, hiprec))
except AttributeError:
# Fixme, this needs to raise a 'skip' exception.
"Skipping test: no ntypes.float96 available on this platform."
def test_underlow(self):
# Regression test for #759:
# instantiating MachAr for dtype = np.float96 raises spurious warning.
with errstate(all='raise'):
try:
self._run_machar_highprec()
except FloatingPointError as e:
msg = "Caught %s exception, should not have been raised." % e
raise AssertionError(msg)