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import datetime
import pickle
import pytest
from pyrsistent import CheckedPVector, InvariantException, optional, CheckedValueTypeError, PVector
class Naturals(CheckedPVector):
__type__ = int
__invariant__ = lambda value: (value >= 0, 'Negative value')
def test_instantiate():
x = Naturals([1, 2, 3])
assert list(x) == [1, 2, 3]
assert isinstance(x, Naturals)
assert isinstance(x, PVector)
def test_append():
x = Naturals()
x2 = x.append(1)
assert list(x2) == [1]
assert isinstance(x2, Naturals)
def test_extend():
x = Naturals()
x2 = x.extend([1])
assert list(x2) == [1]
assert isinstance(x2, Naturals)
def test_set():
x = Naturals([1, 2])
x2 = x.set(1, 3)
assert list(x2) == [1, 3]
assert isinstance(x2, Naturals)
def test_invalid_type():
try:
Naturals([1, 2.0])
assert False
except CheckedValueTypeError as e:
assert e.expected_types == (int,)
assert e.actual_type is float
assert e.actual_value == 2.0
assert e.source_class is Naturals
x = Naturals([1, 2])
with pytest.raises(TypeError):
x.append(3.0)
with pytest.raises(TypeError):
x.extend([3, 4.0])
with pytest.raises(TypeError):
x.set(1, 2.0)
with pytest.raises(TypeError):
x.evolver()[1] = 2.0
def test_breaking_invariant():
try:
Naturals([1, -1])
assert False
except InvariantException as e:
assert e.invariant_errors == ('Negative value',)
x = Naturals([1, 2])
try:
x.append(-1)
assert False
except InvariantException as e:
assert e.invariant_errors == ('Negative value',)
try:
x.extend([-1])
assert False
except InvariantException as e:
assert e.invariant_errors == ('Negative value',)
try:
x.set(1, -1)
assert False
except InvariantException as e:
assert e.invariant_errors == ('Negative value',)
def test_create_base_case():
x = Naturals.create([1, 2, 3])
assert isinstance(x, Naturals)
assert x == Naturals([1, 2, 3])
def test_create_with_instance_of_checked_pvector_returns_the_argument():
x = Naturals([1, 2, 3])
assert Naturals.create(x) is x
class OptionalNaturals(CheckedPVector):
__type__ = optional(int)
__invariant__ = lambda value: (value is None or value >= 0, 'Negative value')
def test_multiple_allowed_types():
assert list(OptionalNaturals([1, None, 3])) == [1, None, 3]
class NaturalsVector(CheckedPVector):
__type__ = optional(Naturals)
def test_create_of_nested_structure():
assert NaturalsVector([Naturals([1, 2]), Naturals([3, 4]), None]) ==\
NaturalsVector.create([[1, 2], [3, 4], None])
def test_serialize_default_case():
v = CheckedPVector([1, 2, 3])
assert v.serialize() == [1, 2, 3]
class Dates(CheckedPVector):
__type__ = datetime.date
@staticmethod
def __serializer__(format, d):
return d.strftime(format)
def test_serialize_custom_serializer():
d = datetime.date
v = Dates([d(2015, 2, 2), d(2015, 2, 3)])
assert v.serialize(format='%Y-%m-%d') == ['2015-02-02', '2015-02-03']
def test_type_information_is_inherited():
class MultiDates(Dates):
__type__ = int
MultiDates([datetime.date(2015, 2, 4), 5])
with pytest.raises(TypeError):
MultiDates([5.0])
def test_invariants_are_inherited():
class LimitNaturals(Naturals):
__invariant__ = lambda value: (value < 10, 'Too big')
try:
LimitNaturals([10, -1])
assert False
except InvariantException as e:
assert e.invariant_errors == ('Too big', 'Negative value')
def test_invariant_must_be_callable():
with pytest.raises(TypeError):
class InvalidInvariant(CheckedPVector):
__invariant__ = 1
def test_type_spec_must_be_type():
with pytest.raises(TypeError):
class InvalidType(CheckedPVector):
__type__ = 1
def test_repr():
x = Naturals([1, 2])
assert str(x) == '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_multiple_optional_types():
class Numbers(CheckedPVector):
__type__ = optional(int, float)
numbers = Numbers([1, 2.5, None])
assert numbers.serialize() == [1, 2.5, None]
with pytest.raises(TypeError):
numbers.append('foo')
class NaturalsVectorStr(CheckedPVector):
__type__ = 'checked_vector_test.Naturals'
def test_check_with_string_specification():
naturals_list = [Naturals([1, 2]), Naturals([3, 4])]
nv = NaturalsVectorStr(naturals_list)
assert nv == naturals_list
def test_create_with_string_specification():
naturals_list = [[1, 2], [3, 4]]
nv = NaturalsVectorStr.create(naturals_list)
assert nv == naturals_list
def test_supports_weakref():
import weakref
weakref.ref(Naturals([]))
def test_create_with_generator_iterator():
# See issue #97
class Numbers(CheckedPVector):
__type__ = int
n = Numbers(i for i in [1, 2, 3])
assert n == Numbers([1, 2, 3])
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