111 lines
2.5 KiB
Python
111 lines
2.5 KiB
Python
"""
|
|
Tests for `attr.validators`.
|
|
"""
|
|
|
|
from __future__ import absolute_import, division, print_function
|
|
|
|
import pytest
|
|
import zope.interface
|
|
|
|
from attr.validators import instance_of, provides
|
|
from attr._compat import TYPE
|
|
from . import simple_attr
|
|
|
|
|
|
class TestInstanceOf(object):
|
|
"""
|
|
Tests for `instance_of`.
|
|
"""
|
|
def test_success(self):
|
|
"""
|
|
Nothing happens if types match.
|
|
"""
|
|
v = instance_of(int)
|
|
v(None, simple_attr("test"), 42)
|
|
|
|
def test_subclass(self):
|
|
"""
|
|
Subclasses are accepted too.
|
|
"""
|
|
v = instance_of(int)
|
|
# yep, bools are a subclass of int :(
|
|
v(None, simple_attr("test"), True)
|
|
|
|
def test_fail(self):
|
|
"""
|
|
Raises `TypeError` on wrong types.
|
|
"""
|
|
v = instance_of(int)
|
|
a = simple_attr("test")
|
|
with pytest.raises(TypeError) as e:
|
|
v(None, a, "42")
|
|
assert (
|
|
"'test' must be <{type} 'int'> (got '42' that is a <{type} "
|
|
"'str'>).".format(type=TYPE),
|
|
a, int, "42",
|
|
|
|
) == e.value.args
|
|
|
|
def test_repr(self):
|
|
"""
|
|
Returned validator has a useful `__repr__`.
|
|
"""
|
|
v = instance_of(int)
|
|
assert (
|
|
"<instance_of validator for type <{type} 'int'>>"
|
|
.format(type=TYPE)
|
|
) == repr(v)
|
|
|
|
|
|
class IFoo(zope.interface.Interface):
|
|
"""
|
|
An interface.
|
|
"""
|
|
def f():
|
|
"""
|
|
A function called f.
|
|
"""
|
|
|
|
|
|
class TestProvides(object):
|
|
"""
|
|
Tests for `provides`.
|
|
"""
|
|
def test_success(self):
|
|
"""
|
|
Nothing happens if value provides requested interface.
|
|
"""
|
|
@zope.interface.implementer(IFoo)
|
|
class C(object):
|
|
def f(self):
|
|
pass
|
|
|
|
v = provides(IFoo)
|
|
v(None, simple_attr("x"), C())
|
|
|
|
def test_fail(self):
|
|
"""
|
|
Raises `TypeError` if interfaces isn't provided by value.
|
|
"""
|
|
value = object()
|
|
a = simple_attr("x")
|
|
|
|
v = provides(IFoo)
|
|
with pytest.raises(TypeError) as e:
|
|
v(None, a, value)
|
|
assert (
|
|
"'x' must provide {interface!r} which {value!r} doesn't."
|
|
.format(interface=IFoo, value=value),
|
|
a, IFoo, value,
|
|
) == e.value.args
|
|
|
|
def test_repr(self):
|
|
"""
|
|
Returned validator has a useful `__repr__`.
|
|
"""
|
|
v = provides(IFoo)
|
|
assert (
|
|
"<provides validator for interface {interface!r}>"
|
|
.format(interface=IFoo)
|
|
) == repr(v)
|