def test_clear(self):
'''
clear().
'''
# Create dict.
sd = Superdict(a=11, b=22)
sd.clear()
# Nothing remains.
with aRaz(AERR): sd.a
with aRaz(AERR): sd.b
with aRaz(KERR): sd['a']
with aRaz(KERR): sd['b']
