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from nose.tools import assert_equal, assert_true
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_equal(set(x.keys()), set(y.keys()))
assert_equal(set(x.keys()), set(z.keys()))
for key in x.keys():
assert_equal(x[key], y[key])
assert_equal(x[key], w[key])
if key in ('mag', 'grad'):
assert_true(x[key] != z[key])
else:
assert_equal(x[key], z[key])
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