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✏️ test_funcattrs.py

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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()

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✏️ test_funcattrs.py