| import types |
| import unittest |
| |
| |
| def global_function(): |
| def inner_function(): |
| class LocalClass: |
| pass |
| global inner_global_function |
| def inner_global_function(): |
| def inner_function2(): |
| pass |
| return inner_function2 |
| return LocalClass |
| return lambda: inner_function |
| |
| |
| class FuncAttrsTest(unittest.TestCase): |
| def setUp(self): |
| class F: |
| def a(self): |
| pass |
| def b(): |
| return 3 |
| self.fi = F() |
| self.F = F |
| self.b = b |
| |
| def cannot_set_attr(self, obj, name, value, exceptions): |
| 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.known_attr = 7 |
| self.assertIn('known_attr', dir(self.fi.a), "set attribute on function " |
| "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___code__(self): |
| def test(): pass |
| self.assertEqual(test(), None) |
| test.__code__ = self.b.__code__ |
| self.assertEqual(test(), 3) # self.b always returns 3, arbitrarily |
| |
| def test___globals__(self): |
| self.assertIs(self.b.__globals__, globals()) |
| self.cannot_set_attr(self.b, '__globals__', 2, |
| (AttributeError, TypeError)) |
| |
| def test___closure__(self): |
| a = 12 |
| def f(): print(a) |
| c = f.__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, "__closure__", c, AttributeError) |
| |
| def test_empty_cell(self): |
| def f(): print(a) |
| try: |
| f.__closure__[0].cell_contents |
| except ValueError: |
| pass |
| else: |
| self.fail("shouldn't be able to read an empty cell") |
| a = 12 |
| |
| def test___name__(self): |
| self.assertEqual(self.b.__name__, 'b') |
| self.b.__name__ = 'c' |
| self.assertEqual(self.b.__name__, 'c') |
| self.b.__name__ = 'd' |
| self.assertEqual(self.b.__name__, 'd') |
| # __name__ and __name__ must be a string |
| self.cannot_set_attr(self.b, '__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, {'__builtins__': {}}) |
| # Test on methods, too |
| self.assertEqual(self.fi.a.__name__, 'a') |
| self.cannot_set_attr(self.fi.a, "__name__", 'a', AttributeError) |
| |
| def test___qualname__(self): |
| # PEP 3155 |
| self.assertEqual(self.b.__qualname__, 'FuncAttrsTest.setUp.<locals>.b') |
| self.assertEqual(FuncAttrsTest.setUp.__qualname__, 'FuncAttrsTest.setUp') |
| self.assertEqual(global_function.__qualname__, 'global_function') |
| self.assertEqual(global_function().__qualname__, |
| 'global_function.<locals>.<lambda>') |
| self.assertEqual(global_function()().__qualname__, |
| 'global_function.<locals>.inner_function') |
| self.assertEqual(global_function()()().__qualname__, |
| 'global_function.<locals>.inner_function.<locals>.LocalClass') |
| self.assertEqual(inner_global_function.__qualname__, 'inner_global_function') |
| self.assertEqual(inner_global_function().__qualname__, 'inner_global_function.<locals>.inner_function2') |
| self.b.__qualname__ = 'c' |
| self.assertEqual(self.b.__qualname__, 'c') |
| self.b.__qualname__ = 'd' |
| self.assertEqual(self.b.__qualname__, 'd') |
| # __qualname__ must be a string |
| self.cannot_set_attr(self.b, '__qualname__', 7, TypeError) |
| |
| def test___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.__code__), types.CodeType) |
| self.assertEqual(c(), 7) |
| self.assertEqual(d(), 8) |
| d.__code__ = c.__code__ |
| self.assertEqual(c.__code__, d.__code__) |
| self.assertEqual(c(), 7) |
| # self.assertEqual(d(), 7) |
| try: |
| b.__code__ = c.__code__ |
| except ValueError: |
| pass |
| else: |
| self.fail("__code__ with different numbers of free vars should " |
| "not be possible") |
| try: |
| e.__code__ = d.__code__ |
| except ValueError: |
| pass |
| else: |
| self.fail("__code__ with different numbers of free vars should " |
| "not be possible") |
| |
| def test_blank_func_defaults(self): |
| self.assertEqual(self.b.__defaults__, None) |
| del self.b.__defaults__ |
| self.assertEqual(self.b.__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.__defaults__, None) |
| self.assertEqual(second_func.__defaults__, (1, 2)) |
| first_func.__defaults__ = (1, 2) |
| self.assertEqual(first_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.__defaults__ |
| self.assertEqual(second_func.__defaults__, None) |
| try: |
| second_func() |
| except TypeError: |
| pass |
| else: |
| self.fail("__defaults__ does not update; deleting it does not " |
| "remove requirement") |
| |
| |
| class InstancemethodAttrTest(FuncAttrsTest): |
| |
| def test___class__(self): |
| self.assertEqual(self.fi.a.__self__.__class__, self.F) |
| self.cannot_set_attr(self.fi.a, "__class__", self.F, TypeError) |
| |
| def test___func__(self): |
| self.assertEqual(self.fi.a.__func__, self.F.a) |
| self.cannot_set_attr(self.fi.a, "__func__", self.F.a, AttributeError) |
| |
| def test___self__(self): |
| self.assertEqual(self.fi.a.__self__, self.fi) |
| self.cannot_set_attr(self.fi.a, "__self__", self.fi, AttributeError) |
| |
| def test___func___non_method(self): |
| # Behavior should be the same when a method is added via an attr |
| # assignment |
| self.fi.id = types.MethodType(id, self.fi) |
| self.assertEqual(self.fi.id(), id(self.fi)) |
| # Test usage |
| try: |
| self.fi.id.unknown_attr |
| except AttributeError: |
| pass |
| else: |
| self.fail("using unknown attributes should raise AttributeError") |
| # Test assignment and deletion |
| self.cannot_set_attr(self.fi.id, 'unknown_attr', 2, AttributeError) |
| |
| |
| class ArbitraryFunctionAttrTest(FuncAttrsTest): |
| def test_set_attr(self): |
| self.b.known_attr = 7 |
| self.assertEqual(self.b.known_attr, 7) |
| try: |
| self.fi.a.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_unset_attr(self): |
| for func in [self.b, 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) |
| from collections import UserDict |
| d = UserDict({'known_attr': 7}) |
| self.cannot_set_attr(self.fi.a.__func__, '__dict__', d, TypeError) |
| |
| def test_setting_dict_to_valid(self): |
| d = {'known_attr': 7} |
| self.b.__dict__ = d |
| # Test assignment |
| self.assertIs(d, self.b.__dict__) |
| # ... and on all the different ways of referencing the method's func |
| self.F.a.__dict__ = d |
| self.assertIs(d, self.fi.a.__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) |
| # ... and again, on all the different method's names |
| self.assertEqual(self.fi.a.__func__.known_attr, 7) |
| self.assertEqual(self.fi.a.known_attr, 7) |
| |
| def test_delete___dict__(self): |
| try: |
| del self.b.__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) |
| docstr = "A test method that does nothing" |
| self.b.__doc__ = docstr |
| self.F.a.__doc__ = docstr |
| self.assertEqual(self.b.__doc__, docstr) |
| self.assertEqual(self.fi.a.__doc__, docstr) |
| 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) |
| |
| |
| def cell(value): |
| """Create a cell containing the given value.""" |
| def f(): |
| print(a) |
| a = value |
| return f.__closure__[0] |
| |
| def empty_cell(empty=True): |
| """Create an empty cell.""" |
| def f(): |
| print(a) |
| # the intent of the following line is simply "if False:"; it's |
| # spelt this way to avoid the danger that a future optimization |
| # might simply remove an "if False:" code block. |
| if not empty: |
| a = 1729 |
| return f.__closure__[0] |
| |
| |
| class CellTest(unittest.TestCase): |
| def test_comparison(self): |
| # These tests are here simply to exercise the comparison code; |
| # their presence should not be interpreted as providing any |
| # guarantees about the semantics (or even existence) of cell |
| # comparisons in future versions of CPython. |
| self.assertTrue(cell(2) < cell(3)) |
| self.assertTrue(empty_cell() < cell('saturday')) |
| self.assertTrue(empty_cell() == empty_cell()) |
| self.assertTrue(cell(-36) == cell(-36.0)) |
| self.assertTrue(cell(True) > empty_cell()) |
| |
| |
| 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) |
| |
| |
| class BuiltinFunctionPropertiesTest(unittest.TestCase): |
| # XXX Not sure where this should really go since I can't find a |
| # test module specifically for builtin_function_or_method. |
| |
| def test_builtin__qualname__(self): |
| import time |
| |
| # builtin function: |
| self.assertEqual(len.__qualname__, 'len') |
| self.assertEqual(time.time.__qualname__, 'time') |
| |
| # builtin classmethod: |
| self.assertEqual(dict.fromkeys.__qualname__, 'dict.fromkeys') |
| self.assertEqual(float.__getformat__.__qualname__, |
| 'float.__getformat__') |
| |
| # builtin staticmethod: |
| self.assertEqual(str.maketrans.__qualname__, 'str.maketrans') |
| self.assertEqual(bytes.maketrans.__qualname__, 'bytes.maketrans') |
| |
| # builtin bound instance method: |
| self.assertEqual([1, 2, 3].append.__qualname__, 'list.append') |
| self.assertEqual({'foo': 'bar'}.pop.__qualname__, 'dict.pop') |
| |
| |
| if __name__ == "__main__": |
| unittest.main() |