234 lines
8.4 KiB
Python
234 lines
8.4 KiB
Python
from test import support
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import types
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import unittest
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class FuncAttrsTest(unittest.TestCase):
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def setUp(self):
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class F:
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def a(self):
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pass
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def b():
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return 3
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self.fi = F()
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self.F = F
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self.b = b
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def cannot_set_attr(self, obj, name, value, exceptions):
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try:
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setattr(obj, name, value)
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except exceptions:
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pass
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else:
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self.fail("shouldn't be able to set %s to %r" % (name, value))
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try:
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delattr(obj, name)
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except exceptions:
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pass
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else:
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self.fail("shouldn't be able to del %s" % name)
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class FunctionPropertiesTest(FuncAttrsTest):
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# Include the external setUp method that is common to all tests
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def test_module(self):
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self.assertEqual(self.b.__module__, __name__)
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def test_dir_includes_correct_attrs(self):
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self.b.known_attr = 7
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self.assert_('known_attr' in dir(self.b),
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"set attributes not in dir listing of method")
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# Test on underlying function object of method
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self.F.a.known_attr = 7
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self.assert_('known_attr' in dir(self.fi.a), "set attribute on function "
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"implementations, should show up in next dir")
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def test_duplicate_function_equality(self):
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# Body of `duplicate' is the exact same as self.b
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def duplicate():
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'my docstring'
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return 3
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self.assertNotEqual(self.b, duplicate)
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def test_copying___code__(self):
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def test(): pass
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self.assertEqual(test(), None)
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test.__code__ = self.b.__code__
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self.assertEqual(test(), 3) # self.b always returns 3, arbitrarily
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def test___globals__(self):
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self.assertEqual(self.b.__globals__, globals())
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self.cannot_set_attr(self.b, '__globals__', 2, (AttributeError, TypeError))
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def test___name__(self):
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self.assertEqual(self.b.__name__, 'b')
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self.b.__name__ = 'c'
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self.assertEqual(self.b.__name__, 'c')
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self.b.__name__ = 'd'
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self.assertEqual(self.b.__name__, 'd')
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# __name__ and __name__ must be a string
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self.cannot_set_attr(self.b, '__name__', 7, TypeError)
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# __name__ must be available when in restricted mode. Exec will raise
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# AttributeError if __name__ is not available on f.
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s = """def f(): pass\nf.__name__"""
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exec(s, {'__builtins__': {}})
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# Test on methods, too
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self.assertEqual(self.fi.a.__name__, 'a')
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self.cannot_set_attr(self.fi.a, "__name__", 'a', AttributeError)
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def test___code__(self):
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num_one, num_two = 7, 8
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def a(): pass
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def b(): return 12
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def c(): return num_one
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def d(): return num_two
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def e(): return num_one, num_two
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for func in [a, b, c, d, e]:
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self.assertEqual(type(func.__code__), types.CodeType)
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self.assertEqual(c(), 7)
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self.assertEqual(d(), 8)
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d.__code__ = c.__code__
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self.assertEqual(c.__code__, d.__code__)
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self.assertEqual(c(), 7)
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# self.assertEqual(d(), 7)
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try: b.__code__ = c.__code__
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except ValueError: pass
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else: self.fail(
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"__code__ with different numbers of free vars should not be "
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"possible")
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try: e.__code__ = d.__code__
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except ValueError: pass
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else: self.fail(
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"__code__ with different numbers of free vars should not be "
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"possible")
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def test_blank_func_defaults(self):
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self.assertEqual(self.b.__defaults__, None)
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del self.b.__defaults__
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self.assertEqual(self.b.__defaults__, None)
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def test_func_default_args(self):
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def first_func(a, b):
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return a+b
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def second_func(a=1, b=2):
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return a+b
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self.assertEqual(first_func.__defaults__, None)
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self.assertEqual(second_func.__defaults__, (1, 2))
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first_func.__defaults__ = (1, 2)
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self.assertEqual(first_func.__defaults__, (1, 2))
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self.assertEqual(first_func(), 3)
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self.assertEqual(first_func(3), 5)
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self.assertEqual(first_func(3, 5), 8)
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del second_func.__defaults__
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self.assertEqual(second_func.__defaults__, None)
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try: second_func()
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except TypeError: pass
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else: self.fail(
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"func_defaults does not update; deleting it does not remove "
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"requirement")
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class ImplicitReferencesTest(FuncAttrsTest):
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def test___class__(self):
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self.assertEqual(self.fi.a.__self__.__class__, self.F)
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self.cannot_set_attr(self.fi.a, "__class__", self.F, TypeError)
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def test___func__(self):
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self.assertEqual(self.fi.a.__func__, self.F.a)
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self.cannot_set_attr(self.fi.a, "__func__", self.F.a, AttributeError)
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def test___self__(self):
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self.assertEqual(self.fi.a.__self__, self.fi)
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self.cannot_set_attr(self.fi.a, "__self__", self.fi, AttributeError)
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def test___func___non_method(self):
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# Behavior should be the same when a method is added via an attr
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# assignment
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self.fi.id = types.MethodType(id, self.fi)
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self.assertEqual(self.fi.id(), id(self.fi))
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# Test usage
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try: self.fi.id.unknown_attr
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except AttributeError: pass
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else: self.fail("using unknown attributes should raise AttributeError")
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# Test assignment and deletion
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self.cannot_set_attr(self.fi.id, 'unknown_attr', 2, AttributeError)
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class ArbitraryFunctionAttrTest(FuncAttrsTest):
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def test_set_attr(self):
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self.b.known_attr = 7
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self.assertEqual(self.b.known_attr, 7)
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try: self.fi.a.known_attr = 7
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except AttributeError: pass
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else: self.fail("setting attributes on methods should raise error")
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def test_delete_unknown_attr(self):
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try: del self.b.unknown_attr
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except AttributeError: pass
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else: self.fail("deleting unknown attribute should raise TypeError")
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def test_unset_attr(self):
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for func in [self.b, self.fi.a]:
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try: func.non_existant_attr
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except AttributeError: pass
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else: self.fail("using unknown attributes should raise "
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"AttributeError")
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class FunctionDictsTest(FuncAttrsTest):
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def test_setting_dict_to_invalid(self):
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self.cannot_set_attr(self.b, '__dict__', None, TypeError)
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from collections import UserDict
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d = UserDict({'known_attr': 7})
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self.cannot_set_attr(self.fi.a.__func__, '__dict__', d, TypeError)
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def test_setting_dict_to_valid(self):
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d = {'known_attr': 7}
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self.b.__dict__ = d
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# Test assignment
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self.assertEqual(d, self.b.__dict__)
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# ... and on all the different ways of referencing the method's func
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self.F.a.__dict__ = d
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self.assertEqual(d, self.fi.a.__func__.__dict__)
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self.assertEqual(d, self.fi.a.__dict__)
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# Test value
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self.assertEqual(self.b.known_attr, 7)
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self.assertEqual(self.b.__dict__['known_attr'], 7)
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# ... and again, on all the different method's names
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self.assertEqual(self.fi.a.__func__.known_attr, 7)
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self.assertEqual(self.fi.a.known_attr, 7)
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def test_delete___dict__(self):
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try: del self.b.__dict__
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except TypeError: pass
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else: self.fail("deleting function dictionary should raise TypeError")
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def test_unassigned_dict(self):
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self.assertEqual(self.b.__dict__, {})
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def test_func_as_dict_key(self):
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value = "Some string"
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d = {}
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d[self.b] = value
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self.assertEqual(d[self.b], value)
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class FunctionDocstringTest(FuncAttrsTest):
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def test_set_docstring_attr(self):
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self.assertEqual(self.b.__doc__, None)
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docstr = "A test method that does nothing"
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self.b.__doc__ = docstr
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self.F.a.__doc__ = docstr
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self.assertEqual(self.b.__doc__, docstr)
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self.assertEqual(self.fi.a.__doc__, docstr)
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self.cannot_set_attr(self.fi.a, "__doc__", docstr, AttributeError)
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def test_delete_docstring(self):
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self.b.__doc__ = "The docstring"
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del self.b.__doc__
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self.assertEqual(self.b.__doc__, None)
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def test_main():
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support.run_unittest(FunctionPropertiesTest, ImplicitReferencesTest,
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ArbitraryFunctionAttrTest, FunctionDictsTest,
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FunctionDocstringTest)
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if __name__ == "__main__":
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test_main()
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