[Python-checkins] r60522 - python/trunk/Lib/test/test_funcattrs.py
georg.brandl
python-checkins at python.org
Sat Feb 2 11:18:16 CET 2008
Author: georg.brandl
Date: Sat Feb 2 11:18:15 2008
New Revision: 60522
Modified:
python/trunk/Lib/test/test_funcattrs.py
Log:
Rewrite test_funcattrs as unittest, written for GHOP by Jeff Wheeler.
Modified: python/trunk/Lib/test/test_funcattrs.py
==============================================================================
--- python/trunk/Lib/test/test_funcattrs.py (original)
+++ python/trunk/Lib/test/test_funcattrs.py Sat Feb 2 11:18:15 2008
@@ -1,414 +1,281 @@
-from test.test_support import verbose, TestFailed, verify
+from test import test_support
import types
+import unittest
-class F:
- def a(self):
- pass
-
-def b():
- '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
+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():
+ 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'
+ 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__': {}}
+ # 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 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
- 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()
+if __name__ == "__main__":
+ test_main()
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