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from copy import deepcopy
from mne.defaults import _handle_default
def test_handle_default():
"""Test mutable default."""
x = deepcopy(_handle_default('scalings'))
y = _handle_default('scalings')
z = _handle_default('scalings', dict(mag=1, grad=2))
w = _handle_default('scalings', {})
assert set(x.keys()) == set(y.keys())
assert set(x.keys()) == set(z.keys())
for key in x.keys():
assert x[key] == y[key]
assert x[key] == w[key]
if key in ('mag', 'grad'):
assert x[key] != z[key]
else:
assert x[key] == z[key]
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