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##############################################################################
#
# Copyright (c) 2003 Zope Foundation and Contributors.
# All Rights Reserved.
#
# This software is subject to the provisions of the Zope Public License,
# Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE.
#
##############################################################################
"""Test the new API for making and checking interface declarations
$Id: test_declarations.py 110827 2010-04-13 20:33:31Z tseaver $
"""
import doctest
import unittest
from zope.interface import Interface, implements
from zope.interface import directlyProvides, providedBy
from zope.interface import classImplements, implementedBy, implementsOnly
class I1(Interface): pass
class I2(Interface): pass
class I3(Interface): pass
class I4(Interface): pass
class I5(Interface): pass
class A(object):
implements(I1)
class B(object):
implements(I2)
class C(A, B):
implements(I3)
class COnly(A, B):
implementsOnly(I3)
class COnly_old(A, B):
__implemented__ = I3
class D(COnly):
implements(I5)
def test_ObjectSpecification_Simple():
"""
>>> c = C()
>>> directlyProvides(c, I4)
>>> [i.__name__ for i in providedBy(c)]
['I4', 'I3', 'I1', 'I2']
"""
def test_ObjectSpecification_Simple_w_only():
"""
>>> c = COnly()
>>> directlyProvides(c, I4)
>>> [i.__name__ for i in providedBy(c)]
['I4', 'I3']
"""
def test_ObjectSpecification_Simple_old_style():
"""
>>> c = COnly_old()
>>> directlyProvides(c, I4)
>>> [i.__name__ for i in providedBy(c)]
['I4', 'I3']
"""
class Test(unittest.TestCase):
# Note that most of the tests are in the doc strings of the
# declarations module.
def test_backward_compat(self):
class C1(object): __implemented__ = I1
class C2(C1): __implemented__ = I2, I5
class C3(C2): __implemented__ = I3, C2.__implemented__
self.assert_(C3.__implemented__.__class__ is tuple)
self.assertEqual(
[i.getName() for i in providedBy(C3())],
['I3', 'I2', 'I5'],
)
class C4(C3):
implements(I4)
self.assertEqual(
[i.getName() for i in providedBy(C4())],
['I4', 'I3', 'I2', 'I5'],
)
self.assertEqual(
[i.getName() for i in C4.__implemented__],
['I4', 'I3', 'I2', 'I5'],
)
# Note that C3.__implemented__ should now be a sequence of interfaces
self.assertEqual(
[i.getName() for i in C3.__implemented__],
['I3', 'I2', 'I5'],
)
self.failIf(C3.__implemented__.__class__ is tuple)
def test_module(self):
from zope.interface.tests import m1, m2
#import zope.interface.tests.m2
directlyProvides(m2,
m1.I1,
m1.I2,
)
self.assertEqual(list(providedBy(m1)),
list(providedBy(m2)),
)
def test_builtins(self):
# Setup
intspec = implementedBy(int)
olddeclared = intspec.declared
classImplements(int, I1)
class myint(int):
implements(I2)
x = 42
self.assertEqual([i.getName() for i in providedBy(x)],
['I1'])
x = myint(42)
directlyProvides(x, I3)
self.assertEqual([i.getName() for i in providedBy(x)],
['I3', 'I2', 'I1'])
# cleanup
intspec.declared = olddeclared
classImplements(int)
x = 42
self.assertEqual([i.getName() for i in providedBy(x)],
[])
def test_signature_w_no_class_interfaces():
"""
>>> from zope.interface import *
>>> class C(object):
... pass
>>> c = C()
>>> list(providedBy(c))
[]
>>> class I(Interface):
... pass
>>> directlyProvides(c, I)
>>> list(providedBy(c)) == list(directlyProvidedBy(c))
1
"""
def test_classImplement_on_deeply_nested_classes():
"""This test is in response to a bug found, which is why it's a bit
contrived
>>> from zope.interface import *
>>> class B1(object):
... pass
>>> class B2(B1):
... pass
>>> class B3(B2):
... pass
>>> class D(object):
... implements()
>>> class S(B3, D):
... implements()
This failed due to a bug in the code for finding __providedBy__
descriptors for old-style classes.
"""
def test_pickle_provides_specs():
"""
>>> from pickle import dumps, loads
>>> a = A()
>>> I2.providedBy(a)
0
>>> directlyProvides(a, I2)
>>> I2.providedBy(a)
1
>>> a2 = loads(dumps(a))
>>> I2.providedBy(a2)
1
"""
def test_that_we_dont_inherit_class_provides():
"""
>>> from zope.interface import classProvides
>>> class X(object):
... classProvides(I1)
>>> class Y(X):
... pass
>>> [i.__name__ for i in X.__provides__]
['I1']
>>> Y.__provides__
Traceback (most recent call last):
...
AttributeError: __provides__
"""
def test_that_we_dont_inherit_provides_optimizations():
"""
When we make a declaration for a class, we install a __provides__
descriptors that provides a default for instances that don't have
instance-specific declarations:
>>> class A(object):
... implements(I1)
>>> class B(object):
... implements(I2)
>>> [i.__name__ for i in A().__provides__]
['I1']
>>> [i.__name__ for i in B().__provides__]
['I2']
But it's important that we don't use this for subclasses without
declarations. This would cause incorrect results:
>>> class X(A, B):
... pass
>>> X().__provides__
Traceback (most recent call last):
...
AttributeError: __provides__
However, if we "induce" a declaration, by calling implementedBy
(even indirectly through providedBy):
>>> [i.__name__ for i in providedBy(X())]
['I1', 'I2']
then the optimization will work:
>>> [i.__name__ for i in X().__provides__]
['I1', 'I2']
"""
def test_classProvides_before_implements():
"""Special descriptor for class __provides__
The descriptor caches the implementedBy info, so that
we can get declarations for objects without instance-specific
interfaces a bit quicker.
For example::
>>> from zope.interface import Interface, classProvides
>>> class IFooFactory(Interface):
... pass
>>> class IFoo(Interface):
... pass
>>> class C(object):
... classProvides(IFooFactory)
... implements(IFoo)
>>> [i.getName() for i in C.__provides__]
['IFooFactory']
>>> [i.getName() for i in C().__provides__]
['IFoo']
"""
def test_getting_spec_for_proxied_builtin_class():
"""
In general, we should be able to get a spec
for a proxied class if someone has declared or
asked for a spec before.
We don't want to depend on proxies in this (zope.interface)
package, but we do want to work with proxies. Proxies have the
effect that a class's __dict__ cannot be gotten. Further, for
built-in classes, we can't save, and thus, cannot get, any class
attributes. We'll emulate this by treating a plain object as a class:
>>> cls = object()
We'll create an implements specification:
>>> import zope.interface.declarations
>>> impl = zope.interface.declarations.Implements(I1, I2)
Now, we'll emulate a declaration for a built-in type by putting
it in BuiltinImplementationSpecifications:
>>> zope.interface.declarations.BuiltinImplementationSpecifications[
... cls] = impl
Now, we should be able to get it back:
>>> implementedBy(cls) is impl
True
Of course, we don't want to leave it there. :)
>>> del zope.interface.declarations.BuiltinImplementationSpecifications[
... cls]
"""
def test_declaration_get():
"""
We can get definitions from a declaration:
>>> import zope.interface
>>> class I1(zope.interface.Interface):
... a11 = zope.interface.Attribute('a11')
... a12 = zope.interface.Attribute('a12')
>>> class I2(zope.interface.Interface):
... a21 = zope.interface.Attribute('a21')
... a22 = zope.interface.Attribute('a22')
... a12 = zope.interface.Attribute('a212')
>>> class I11(I1):
... a11 = zope.interface.Attribute('a111')
>>> decl = zope.interface.Declaration(I11, I2)
>>> decl.get('a11') is I11.get('a11')
True
>>> decl.get('a12') is I1.get('a12')
True
>>> decl.get('a21') is I2.get('a21')
True
>>> decl.get('a22') is I2.get('a22')
True
>>> decl.get('a')
>>> decl.get('a', 42)
42
We get None even with no interfaces:
>>> decl = zope.interface.Declaration()
>>> decl.get('a11')
>>> decl.get('a11', 42)
42
We get new data if e change interface bases:
>>> decl.__bases__ = I11, I2
>>> decl.get('a11') is I11.get('a11')
True
"""
def test_classImplements_after_classImplementsOnly_issue_402():
"""http://www.zope.org/Collectors/Zope3-dev/402
>>> from zope.interface import *
>>> class I1(Interface):
... pass
>>> class I2(Interface):
... pass
>>> class C:
... implements(I1)
>>> class C2:
... implementsOnly(I2)
>>> class I3(Interface):
... pass
>>> [i.__name__ for i in providedBy(C2()).__iro__]
['I2', 'Interface']
>>> classImplements(C2, I3)
>>> [i.__name__ for i in providedBy(C2()).__iro__]
['I2', 'I3', 'Interface']
>>> class I4(Interface):
... pass
>>> classImplements(C2, I4)
>>> [i.__name__ for i in providedBy(C2()).__iro__]
['I2', 'I3', 'I4', 'Interface']
"""
def test_picklability_of_implements_specifications():
"""
Sometimes, we need to pickle implements specs. We should be able
to do so as long as the class is picklable.
>>> import pickle
>>> pickle.loads(pickle.dumps(implementedBy(C))) is implementedBy(C)
True
"""
def test_provided_by_with_slots():
"""
This is an edge case: if the __slots__ of a class contain '__provides__',
using providedBy() on that class should still work (this occurs, for
example, when providing an adapter for a concrete class.)
>>> import zope.interface
>>> class Slotted(object):
... __slots__ = ('__provides__')
>>> class IFoo(zope.interface.Interface):
... pass
>>> IFoo.providedBy(Slotted)
False
"""
def test_suite():
return unittest.TestSuite((
unittest.makeSuite(Test),
doctest.DocTestSuite("zope.interface.declarations"),
doctest.DocTestSuite(),
))
