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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.

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