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Kaydet (Commit) c8088df3 authored tarafından Georg Brandl's avatar Georg Brandl
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Rewrite test_funcattrs as unittest, written for GHOP by Jeff Wheeler.

üst 4854552f
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Lib/test/test_funcattrs.py
Dosyayı görüntüle @ c8088df3
from test.test_support import verbose, TestFailed, verify
from test import test_support
import types
class F:
import unittest
def cannot_set_attr(obj, name, value, exceptions):
# This method is not called as a test (name doesn't start with 'test'),
# but may be used by other tests.
try: setattr(obj, name, value)
except exceptions: pass
else: self.fail("shouldn't be able to set %s to %r" % (name, value))
try: delattr(obj, name)
except exceptions: pass
else: self.fail("shouldn't be able to del %s" % name)
class FuncAttrsTest(unittest.TestCase):
def setUp(self):
class F:
def a(self):
pass
def b():
def b():
return 3
self.f = F
self.fi = F()
self.b = b
class FunctionPropertiesTest(FuncAttrsTest):
# Include the external setUp method that is common to all tests
def test_module(self):
self.assertEqual(self.b.__module__, __name__)
def test_dir_includes_correct_attrs(self):
self.b.known_attr = 7
self.assert_('known_attr' in dir(self.b),
"set attributes not in dir listing of method")
# Test on underlying function object of method
self.f.a.im_func.known_attr = 7
self.assert_('known_attr' in dir(self.f.a),
"set attribute on unbound method implementation in class not in "
"dir")
self.assert_('known_attr' in dir(self.fi.a),
"set attribute on unbound method implementations, should show up"
" in next dir")
def test_duplicate_function_equality(self):
# Body of `duplicate' is the exact same as self.b
def duplicate():
'my docstring'
pass
# __module__ is a special attribute
verify(b.__module__ == __name__)
verify(verify.__module__ == "test.test_support")
# setting attributes on functions
try:
b.publish
except AttributeError: pass
else: raise TestFailed, 'expected AttributeError'
if b.__dict__ <> {}:
raise TestFailed, 'expected unassigned func.__dict__ to be {}'
b.publish = 1
if b.publish <> 1:
raise TestFailed, 'function attribute not set to expected value'
docstring = 'its docstring'
b.__doc__ = docstring
if b.__doc__ <> docstring:
raise TestFailed, 'problem with setting __doc__ attribute'
if 'publish' not in dir(b):
raise TestFailed, 'attribute not in dir()'
try:
del b.__dict__
except TypeError: pass
else: raise TestFailed, 'del func.__dict__ expected TypeError'
b.publish = 1
try:
b.__dict__ = None
except TypeError: pass
else: raise TestFailed, 'func.__dict__ = None expected TypeError'
d = {'hello': 'world'}
b.__dict__ = d
if b.func_dict is not d:
raise TestFailed, 'func.__dict__ assignment to dictionary failed'
if b.hello <> 'world':
raise TestFailed, 'attribute after func.__dict__ assignment failed'
f1 = F()
f2 = F()
try:
F.a.publish
except AttributeError: pass
else: raise TestFailed, 'expected AttributeError'
try:
f1.a.publish
except AttributeError: pass
else: raise TestFailed, 'expected AttributeError'
# In Python 2.1 beta 1, we disallowed setting attributes on unbound methods
# (it was already disallowed on bound methods). See the PEP for details.
try:
F.a.publish = 1
except (AttributeError, TypeError): pass
else: raise TestFailed, 'expected AttributeError or TypeError'
# But setting it explicitly on the underlying function object is okay.
F.a.im_func.publish = 1
if F.a.publish <> 1:
raise TestFailed, 'unbound method attribute not set to expected value'
if f1.a.publish <> 1:
raise TestFailed, 'bound method attribute access did not work'
if f2.a.publish <> 1:
raise TestFailed, 'bound method attribute access did not work'
if 'publish' not in dir(F.a):
raise TestFailed, 'attribute not in dir()'
try:
f1.a.publish = 0
except (AttributeError, TypeError): pass
else: raise TestFailed, 'expected AttributeError or TypeError'
# See the comment above about the change in semantics for Python 2.1b1
try:
F.a.myclass = F
except (AttributeError, TypeError): pass
else: raise TestFailed, 'expected AttributeError or TypeError'
F.a.im_func.myclass = F
f1.a.myclass
f2.a.myclass
f1.a.myclass
F.a.myclass
if f1.a.myclass is not f2.a.myclass or \
f1.a.myclass is not F.a.myclass:
raise TestFailed, 'attributes were not the same'
# try setting __dict__
try:
F.a.__dict__ = (1, 2, 3)
except (AttributeError, TypeError): pass
else: raise TestFailed, 'expected TypeError or AttributeError'
F.a.im_func.__dict__ = {'one': 11, 'two': 22, 'three': 33}
if f1.a.two <> 22:
raise TestFailed, 'setting __dict__'
from UserDict import UserDict
d = UserDict({'four': 44, 'five': 55})
try:
F.a.__dict__ = d
except (AttributeError, TypeError): pass
else: raise TestFailed
if f2.a.one <> f1.a.one <> F.a.one <> 11:
raise TestFailed
# im_func may not be a Python method!
import types
F.id = types.MethodType(id, None, F)
eff = F()
if eff.id() <> id(eff):
raise TestFailed
try:
F.id.foo
except AttributeError: pass
else: raise TestFailed
try:
F.id.foo = 12
except (AttributeError, TypeError): pass
else: raise TestFailed
try:
F.id.foo
except AttributeError: pass
else: raise TestFailed
try:
eff.id.foo
except AttributeError: pass
else: raise TestFailed
try:
eff.id.foo = 12
except (AttributeError, TypeError): pass
else: raise TestFailed
try:
eff.id.foo
except AttributeError: pass
else: raise TestFailed
# Regression test for a crash in pre-2.1a1
def another():
pass
try:
del another.__dict__
except TypeError: pass
else: raise TestFailed
try:
del another.func_dict
except TypeError: pass
else: raise TestFailed
try:
another.func_dict = None
except TypeError: pass
else: raise TestFailed
try:
del another.bar
except AttributeError: pass
else: raise TestFailed
# This isn't specifically related to function attributes, but it does test a
# core dump regression in funcobject.c
del another.func_defaults
def foo():
pass
def bar():
pass
def temp():
print 1
if foo==bar:
raise TestFailed
d={}
d[foo] = 1
foo.func_code = temp.func_code
d[foo]
# Test all predefined function attributes systematically
def cantset(obj, name, value, exception=(AttributeError, TypeError)):
verify(hasattr(obj, name)) # Otherwise it's probably a typo
try:
setattr(obj, name, value)
except exception:
pass
else:
raise TestFailed, "shouldn't be able to set %s to %r" % (name, value)
try:
delattr(obj, name)
except (AttributeError, TypeError):
pass
else:
raise TestFailed, "shouldn't be able to del %s" % name
def test_func_closure():
a = 12
def f(): print a
c = f.func_closure
verify(isinstance(c, tuple))
verify(len(c) == 1)
verify(c[0].__class__.__name__ == "cell") # don't have a type object handy
cantset(f, "func_closure", c)
def test_empty_cell():
def f(): print a
try:
f.func_closure[0].cell_contents
except ValueError:
pass
else:
raise TestFailed, "shouldn't be able to read an empty cell"
a = 12
def test_func_doc():
def f(): pass
verify(f.__doc__ is None)
verify(f.func_doc is None)
f.__doc__ = "hello"
verify(f.__doc__ == "hello")
verify(f.func_doc == "hello")
del f.__doc__
verify(f.__doc__ is None)
verify(f.func_doc is None)
f.func_doc = "world"
verify(f.__doc__ == "world")
verify(f.func_doc == "world")
del f.func_doc
verify(f.func_doc is None)
verify(f.__doc__ is None)
def test_func_globals():
def f(): pass
verify(f.func_globals is globals())
cantset(f, "func_globals", globals())
def test_func_name():
def f(): pass
verify(f.__name__ == "f")
verify(f.func_name == "f")
f.__name__ = "g"
verify(f.__name__ == "g")
verify(f.func_name == "g")
f.func_name = "h"
verify(f.__name__ == "h")
verify(f.func_name == "h")
cantset(f, "func_globals", 1)
cantset(f, "__name__", 1)
# test that you can access func.__name__ in restricted mode
return 3
self.assertNotEqual(self.b, duplicate)
def test_copying_func_code(self):
def test(): pass
self.assertEqual(test(), None)
test.func_code = self.b.func_code
self.assertEqual(test(), 3) # self.b always returns 3, arbitrarily
def test_func_globals(self):
self.assertEqual(self.b.func_globals, globals())
cannot_set_attr(self.b, 'func_globals', 2, TypeError)
def test_func_name(self):
self.assertEqual(self.b.__name__, 'b')
self.assertEqual(self.b.func_name, 'b')
self.b.__name__ = 'c'
self.assertEqual(self.b.__name__, 'c')
self.assertEqual(self.b.func_name, 'c')
self.b.func_name = 'd'
self.assertEqual(self.b.__name__, 'd')
self.assertEqual(self.b.func_name, 'd')
# __name__ and func_name must be a string
cannot_set_attr(self.b, '__name__', 7, TypeError)
cannot_set_attr(self.b, 'func_name', 7, TypeError)
# __name__ must be available when in restricted mode. Exec will raise
# AttributeError if __name__ is not available on f.
s = """def f(): pass\nf.__name__"""
exec s in {'__builtins__':{}}
def test_func_code():
a = b = 24
def f(): pass
def g(): print 12
def f1(): print a
def g1(): print b
def f2(): print a, b
verify(type(f.func_code) is types.CodeType)
f.func_code = g.func_code
cantset(f, "func_code", None)
# can't change the number of free vars
cantset(f, "func_code", f1.func_code, exception=ValueError)
cantset(f1, "func_code", f.func_code, exception=ValueError)
cantset(f1, "func_code", f2.func_code, exception=ValueError)
f1.func_code = g1.func_code
def test_func_defaults():
def f(a, b): return (a, b)
verify(f.func_defaults is None)
f.func_defaults = (1, 2)
verify(f.func_defaults == (1, 2))
verify(f(10) == (10, 2))
def g(a=1, b=2): return (a, b)
verify(g.func_defaults == (1, 2))
del g.func_defaults
verify(g.func_defaults is None)
try:
g()
except TypeError:
pass
else:
raise TestFailed, "shouldn't be allowed to call g() w/o defaults"
def test_func_dict():
def f(): pass
a = f.__dict__
b = f.func_dict
verify(a == {})
verify(a is b)
f.hello = 'world'
verify(a == {'hello': 'world'})
verify(f.func_dict is a is f.__dict__)
f.func_dict = {}
verify(not hasattr(f, "hello"))
f.__dict__ = {'world': 'hello'}
verify(f.world == "hello")
verify(f.__dict__ is f.func_dict == {'world': 'hello'})
cantset(f, "func_dict", None)
cantset(f, "__dict__", None)
def test_im_class():
class C:
def foo(self): pass
verify(C.foo.im_class is C)
verify(C().foo.im_class is C)
cantset(C.foo, "im_class", C)
cantset(C().foo, "im_class", C)
def test_im_func():
def foo(self): pass
class C:
pass
C.foo = foo
verify(C.foo.im_func is foo)
verify(C().foo.im_func is foo)
cantset(C.foo, "im_func", foo)
cantset(C().foo, "im_func", foo)
def test_im_self():
class C:
def foo(self): pass
verify(C.foo.im_self is None)
c = C()
verify(c.foo.im_self is c)
cantset(C.foo, "im_self", None)
cantset(c.foo, "im_self", c)
def test_im_dict():
class C:
def foo(self): pass
foo.bar = 42
verify(C.foo.__dict__ == {'bar': 42})
verify(C().foo.__dict__ == {'bar': 42})
cantset(C.foo, "__dict__", C.foo.__dict__)
cantset(C().foo, "__dict__", C.foo.__dict__)
def test_im_doc():
class C:
def foo(self): "hello"
verify(C.foo.__doc__ == "hello")
verify(C().foo.__doc__ == "hello")
cantset(C.foo, "__doc__", "hello")
cantset(C().foo, "__doc__", "hello")
def test_im_name():
class C:
def foo(self): pass
verify(C.foo.__name__ == "foo")
verify(C().foo.__name__ == "foo")
cantset(C.foo, "__name__", "foo")
cantset(C().foo, "__name__", "foo")
def testmore():
test_func_closure()
test_empty_cell()
test_func_doc()
test_func_globals()
test_func_name()
test_func_code()
test_func_defaults()
test_func_dict()
# Tests for instance method attributes
test_im_class()
test_im_func()
test_im_self()
test_im_dict()
test_im_doc()
test_im_name()
testmore()
exec s in {'__builtins__': {}}
# Test on methods, too
self.assertEqual(self.f.a.__name__, 'a')
self.assertEqual(self.fi.a.__name__, 'a')
cannot_set_attr(self.f.a, "__name__", 'a', AttributeError)
cannot_set_attr(self.fi.a, "__name__", 'a', AttributeError)
def test_func_code(self):
num_one, num_two = 7, 8
def a(): pass
def b(): return 12
def c(): return num_one
def d(): return num_two
def e(): return num_one, num_two
for func in [a, b, c, d, e]:
self.assertEqual(type(func.func_code), types.CodeType)
self.assertEqual(c(), 7)
self.assertEqual(d(), 8)
d.func_code = c.func_code
self.assertEqual(c.func_code, d.func_code)
self.assertEqual(c(), 7)
# self.assertEqual(d(), 7)
try: b.func_code = c.func_code
except ValueError: pass
else: self.fail(
"func_code with different numbers of free vars should not be "
"possible")
try: e.func_code = d.func_code
except ValueError: pass
else: self.fail(
"func_code with different numbers of free vars should not be "
"possible")
def test_blank_func_defaults(self):
self.assertEqual(self.b.func_defaults, None)
del self.b.func_defaults
self.assertEqual(self.b.func_defaults, None)
def test_func_default_args(self):
def first_func(a, b):
return a+b
def second_func(a=1, b=2):
return a+b
self.assertEqual(first_func.func_defaults, None)
self.assertEqual(second_func.func_defaults, (1, 2))
first_func.func_defaults = (1, 2)
self.assertEqual(first_func.func_defaults, (1, 2))
self.assertEqual(first_func(), 3)
self.assertEqual(first_func(3), 5)
self.assertEqual(first_func(3, 5), 8)
del second_func.func_defaults
self.assertEqual(second_func.func_defaults, None)
try: second_func()
except TypeError: pass
else: self.fail(
"func_defaults does not update; deleting it does not remove "
"requirement")
class ImplicitReferencesTest(FuncAttrsTest):
def test_im_class(self):
self.assertEqual(self.f.a.im_class, self.f)
self.assertEqual(self.fi.a.im_class, self.f)
cannot_set_attr(self.f.a, "im_class", self.f, TypeError)
cannot_set_attr(self.fi.a, "im_class", self.f, TypeError)
def test_im_func(self):
self.f.b = self.b
self.assertEqual(self.f.b.im_func, self.b)
self.assertEqual(self.fi.b.im_func, self.b)
cannot_set_attr(self.f.b, "im_func", self.b, TypeError)
cannot_set_attr(self.fi.b, "im_func", self.b, TypeError)
def test_im_self(self):
self.assertEqual(self.f.a.im_self, None)
self.assertEqual(self.fi.a.im_self, self.fi)
cannot_set_attr(self.f.a, "im_self", None, TypeError)
cannot_set_attr(self.fi.a, "im_self", self.fi, TypeError)
def test_im_func_non_method(self):
# Behavior should be the same when a method is added via an attr
# assignment
self.f.id = types.MethodType(id, None, self.f)
self.assertEqual(self.fi.id(), id(self.fi))
self.assertNotEqual(self.fi.id(), id(self.f))
# Test usage
try: self.f.id.unknown_attr
except AttributeError: pass
else: self.fail("using unknown attributes should raise AttributeError")
# Test assignment and deletion
cannot_set_attr(self.f.id, 'unknown_attr', 2, AttributeError)
cannot_set_attr(self.fi.id, 'unknown_attr', 2, AttributeError)
def test_implicit_method_properties(self):
self.f.a.im_func.known_attr = 7
self.assertEqual(self.f.a.known_attr, 7)
self.assertEqual(self.fi.a.known_attr, 7)
class ArbitraryFunctionAttrTest(FuncAttrsTest):
def test_set_attr(self):
self.b.known_attr = 7
self.assertEqual(self.b.known_attr, 7)
for func in [self.f.a, self.fi.a]:
try: func.known_attr = 7
except AttributeError: pass
else: self.fail("setting attributes on methods should raise error")
def test_delete_unknown_attr(self):
try: del self.b.unknown_attr
except AttributeError: pass
else: self.fail("deleting unknown attribute should raise TypeError")
def test_setting_attrs_duplicates(self):
try: self.f.a.klass = self.f
except AttributeError: pass
else: self.fail("setting arbitrary attribute in unbound function "
" should raise AttributeError")
self.f.a.im_func.klass = self.f
for method in [self.f.a, self.fi.a, self.fi.a.im_func]:
self.assertEqual(method.klass, self.f)
def test_unset_attr(self):
for func in [self.b, self.f.a, self.fi.a]:
try: func.non_existant_attr
except AttributeError: pass
else: self.fail("using unknown attributes should raise "
"AttributeError")
class FunctionDictsTest(FuncAttrsTest):
def test_setting_dict_to_invalid(self):
cannot_set_attr(self.b, '__dict__', None, TypeError)
cannot_set_attr(self.b, 'func_dict', None, TypeError)
from UserDict import UserDict
d = UserDict({'known_attr': 7})
cannot_set_attr(self.f.a.im_func, '__dict__', d, TypeError)
cannot_set_attr(self.fi.a.im_func, '__dict__', d, TypeError)
def test_setting_dict_to_valid(self):
d = {'known_attr': 7}
self.b.__dict__ = d
# Setting dict is only possible on the underlying function objects
self.f.a.im_func.__dict__ = d
# Test assignment
self.assertEqual(d, self.b.__dict__)
self.assertEqual(d, self.b.func_dict)
# ... and on all the different ways of referencing the method's func
self.assertEqual(d, self.f.a.im_func.__dict__)
self.assertEqual(d, self.f.a.__dict__)
self.assertEqual(d, self.fi.a.im_func.__dict__)
self.assertEqual(d, self.fi.a.__dict__)
# Test value
self.assertEqual(self.b.known_attr, 7)
self.assertEqual(self.b.__dict__['known_attr'], 7)
self.assertEqual(self.b.func_dict['known_attr'], 7)
# ... and again, on all the different method's names
self.assertEqual(self.f.a.im_func.known_attr, 7)
self.assertEqual(self.f.a.known_attr, 7)
self.assertEqual(self.fi.a.im_func.known_attr, 7)
self.assertEqual(self.fi.a.known_attr, 7)
def test_delete_func_dict(self):
try: del self.b.__dict__
except TypeError: pass
else: self.fail("deleting function dictionary should raise TypeError")
try: del self.b.func_dict
except TypeError: pass
else: self.fail("deleting function dictionary should raise TypeError")
def test_unassigned_dict(self):
self.assertEqual(self.b.__dict__, {})
def test_func_as_dict_key(self):
value = "Some string"
d = {}
d[self.b] = value
self.assertEqual(d[self.b], value)
class FunctionDocstringTest(FuncAttrsTest):
def test_set_docstring_attr(self):
self.assertEqual(self.b.__doc__, None)
self.assertEqual(self.b.func_doc, None)
docstr = "A test method that does nothing"
self.b.__doc__ = self.f.a.im_func.__doc__ = docstr
self.assertEqual(self.b.__doc__, docstr)
self.assertEqual(self.b.func_doc, docstr)
self.assertEqual(self.f.a.__doc__, docstr)
self.assertEqual(self.fi.a.__doc__, docstr)
cannot_set_attr(self.f.a, "__doc__", docstr, AttributeError)
cannot_set_attr(self.fi.a, "__doc__", docstr, AttributeError)
def test_delete_docstring(self):
self.b.__doc__ = "The docstring"
del self.b.__doc__
self.assertEqual(self.b.__doc__, None)
self.assertEqual(self.b.func_doc, None)
self.b.func_doc = "The docstring"
del self.b.func_doc
self.assertEqual(self.b.__doc__, None)
self.assertEqual(self.b.func_doc, None)
def test_main():
test_support.run_unittest(FunctionPropertiesTest, ImplicitReferencesTest,
ArbitraryFunctionAttrTest, FunctionDictsTest,
FunctionDocstringTest)
if __name__ == "__main__":
test_main()
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