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import pickle
import pytest
from pyrsistent import CheckedPSet, PSet, InvariantException, CheckedType, CheckedPVector, CheckedValueTypeError
class Naturals(CheckedPSet):
__type__ = int
__invariant__ = lambda value: (value >= 0, 'Negative value')
def test_instantiate():
x = Naturals([1, 2, 3, 3])
assert list(x) == [1, 2, 3]
assert isinstance(x, Naturals)
assert isinstance(x, PSet)
assert isinstance(x, CheckedType)
def test_add():
x = Naturals()
x2 = x.add(1)
assert list(x2) == [1]
assert isinstance(x2, Naturals)
def test_invalid_type():
with pytest.raises(CheckedValueTypeError):
Naturals([1, 2.0])
def test_breaking_invariant():
try:
Naturals([1, -1])
assert False
except InvariantException as e:
assert e.invariant_errors == ('Negative value',)
def test_repr():
x = Naturals([1, 2])
assert str(x) == 'Naturals([1, 2])'
def test_default_serialization():
x = Naturals([1, 2])
assert x.serialize() == set([1, 2])
class StringNaturals(Naturals):
@staticmethod
def __serializer__(format, value):
return format.format(value)
def test_custom_serialization():
x = StringNaturals([1, 2])
assert x.serialize("{0}") == set(["1", "2"])
class NaturalsVector(CheckedPVector):
__type__ = Naturals
def test_multi_level_serialization():
x = NaturalsVector.create([[1, 2], [3, 4]])
assert str(x) == "NaturalsVector([Naturals([1, 2]), Naturals([3, 4])])"
sx = x.serialize()
assert sx == [set([1, 2]), set([3, 4])]
assert isinstance(sx[0], set)
def test_create():
assert Naturals.create([1, 2]) == Naturals([1, 2])
def test_evolver_returns_same_instance_when_no_updates():
x = Naturals([1, 2])
assert x.evolver().persistent() is x
def test_pickling():
x = Naturals([1, 2])
y = pickle.loads(pickle.dumps(x, -1))
assert x == y
assert isinstance(y, Naturals)
def test_supports_weakref():
import weakref
weakref.ref(Naturals([1, 2]))
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