/Lib/test/test_funcattrs.py
http://unladen-swallow.googlecode.com/ · Python · 282 lines · 233 code · 30 blank · 19 comment · 41 complexity · 3512f058d8ad358e964385ac4480c570 MD5 · raw file
- from test import test_support
- import types
- import unittest
- 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
- def cannot_set_attr(self,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 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())
- self.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
- self.cannot_set_attr(self.b, '__name__', 7, TypeError)
- self.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')
- self.cannot_set_attr(self.f.a, "__name__", 'a', AttributeError)
- self.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)
- self.cannot_set_attr(self.f.a, "im_class", self.f, TypeError)
- self.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)
- self.cannot_set_attr(self.f.b, "im_func", self.b, TypeError)
- self.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)
- self.cannot_set_attr(self.f.a, "im_self", None, TypeError)
- self.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
- self.cannot_set_attr(self.f.id, 'unknown_attr', 2, AttributeError)
- self.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_existent_attr
- except AttributeError: pass
- else: self.fail("using unknown attributes should raise "
- "AttributeError")
- class FunctionDictsTest(FuncAttrsTest):
- def test_setting_dict_to_invalid(self):
- self.cannot_set_attr(self.b, '__dict__', None, TypeError)
- self.cannot_set_attr(self.b, 'func_dict', None, TypeError)
- from UserDict import UserDict
- d = UserDict({'known_attr': 7})
- self.cannot_set_attr(self.f.a.im_func, '__dict__', d, TypeError)
- self.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)
- self.cannot_set_attr(self.f.a, "__doc__", docstr, AttributeError)
- self.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()