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import pytest
from pyrsistent import immutable
class Empty(immutable(verbose=True)):
pass
class Single(immutable('x')):
pass
class FrozenMember(immutable('x, y_')):
pass
class DerivedWithNew(immutable(['x', 'y'])):
def __new__(cls, x, y):
return super(DerivedWithNew, cls).__new__(cls, x, y)
def test_instantiate_object_with_no_members():
t = Empty()
t2 = t.set()
assert t is t2
def test_assign_non_existing_attribute():
t = Empty()
with pytest.raises(AttributeError):
t.set(a=1)
def test_basic_instantiation():
t = Single(17)
assert t.x == 17
assert str(t) == 'Single(x=17)'
def test_cannot_modify_member():
t = Single(17)
with pytest.raises(AttributeError):
t.x = 18
def test_basic_replace():
t = Single(17)
t2 = t.set(x=18)
assert t.x == 17
assert t2.x == 18
def test_cannot_replace_frozen_member():
t = FrozenMember(17, 18)
with pytest.raises(AttributeError):
t.set(y_=18)
def test_derived_class_with_new():
d = DerivedWithNew(1, 2)
d2 = d.set(x=3)
assert d2.x == 3
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