| 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): |
| # Helper method for 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.assertIn('known_attr', 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.assertIn('known_attr', dir(self.f.a), |
| "set attribute on unbound method implementation in " |
| "class not in dir") |
| self.assertIn('known_attr', 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.assertIs(self.b.func_globals, globals()) |
| self.cannot_set_attr(self.b, 'func_globals', 2, TypeError) |
| |
| def test_func_closure(self): |
| a = 12 |
| def f(): print a |
| c = f.func_closure |
| self.assertIsInstance(c, tuple) |
| self.assertEqual(len(c), 1) |
| # don't have a type object handy |
| self.assertEqual(c[0].__class__.__name__, "cell") |
| self.cannot_set_attr(f, "func_closure", c, TypeError) |
| |
| def test_empty_cell(self): |
| def f(): print a |
| try: |
| f.func_closure[0].cell_contents |
| except ValueError: |
| pass |
| else: |
| self.fail("shouldn't be able to read an empty cell") |
| a = 12 |
| |
| 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 InstancemethodAttrTest(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): |
| # setting attributes only works on function objects |
| 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.assertIs(d, self.b.__dict__) |
| self.assertIs(d, self.b.func_dict) |
| # ... and on all the different ways of referencing the method's func |
| self.assertIs(d, self.f.a.im_func.__dict__) |
| self.assertIs(d, self.f.a.__dict__) |
| self.assertIs(d, self.fi.a.im_func.__dict__) |
| self.assertIs(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) |
| |
| |
| class StaticMethodAttrsTest(unittest.TestCase): |
| def test_func_attribute(self): |
| def f(): |
| pass |
| |
| c = classmethod(f) |
| self.assertTrue(c.__func__ is f) |
| |
| s = staticmethod(f) |
| self.assertTrue(s.__func__ is f) |
| |
| |
| def test_main(): |
| test_support.run_unittest(FunctionPropertiesTest, InstancemethodAttrTest, |
| ArbitraryFunctionAttrTest, FunctionDictsTest, |
| FunctionDocstringTest, |
| StaticMethodAttrsTest) |
| |
| if __name__ == "__main__": |
| test_main() |
