def test_init():
c = FrozenCounter({1: 2})
assert isinstance(c, FrozenCounter)
def test_inplace_operation():
c = FrozenCounter({1: 2})
d = c
c += FrozenCounter({2: 3})
assert c == FrozenCounter({1: 2, 2: 3})
assert d == FrozenCounter({1: 2})
def test_setitem():
c = FrozenCounter({1: 2})
with pytest.raises(FrozenInstanceError):
c[2] = 3
with pytest.raises(FrozenInstanceError):
c[1] = 3
def test_hash():
c = FrozenCounter({1: 2})
d = FrozenCounter({1: 2})
assert hash(c) == hash(d)
assert hash(frozenset((1, 2))) != hash(c)
def test_copy():
c = FrozenCounter({1: 2})
d = c.copy()
assert c == d
assert c is not d
def test_missing_key():
c = FrozenCounter({1: 2})
c[1]
c[0]
def test_setter():
c = FrozenCounter({1: 2})
with pytest.raises(FrozenInstanceError):
c[1] += 2
def __init__(self, *args):
return FrozenCounter.__init__(self, (Particle(p) for p in args))