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# UserString is a wrapper around the native builtin string type.
# UserString instances should behave similar to builtin string objects.
import unittest
from test import string_tests
from test import support
from collections import UserString
class UserStringSubclass(UserString):
pass
class UserStringSubclass2(UserString):
pass
class UserStringTest(
string_tests.StringLikeTest,
unittest.TestCase
):
type2test = UserString
# Overwrite the three testing methods, because UserString
# can't cope with arguments propagated to UserString
# (and we don't test with subclasses)
def checkequal(self, result, object, methodname, *args, **kwargs):
result = self.fixtype(result)
object = self.fixtype(object)
# we don't fix the arguments, because UserString can't cope with it
realresult = getattr(object, methodname)(*args, **kwargs)
self.assertEqual(
result,
realresult
)
def checkraises(self, exc, obj, methodname, *args, expected_msg=None):
obj = self.fixtype(obj)
# we don't fix the arguments, because UserString can't cope with it
with self.assertRaises(exc) as cm:
getattr(obj, methodname)(*args)
self.assertNotEqual(str(cm.exception), '')
if expected_msg is not None:
self.assertEqual(str(cm.exception), expected_msg)
def checkcall(self, object, methodname, *args):
object = self.fixtype(object)
# we don't fix the arguments, because UserString can't cope with it
getattr(object, methodname)(*args)
def test_data(self):
u = UserString("spam")
self.assertEqual(u.data, "spam")
self.assertIs(type(u.data), str)
u = UserString(u)
self.assertEqual(u.data, "spam")
self.assertIs(type(u.data), str)
u = UserString(42)
self.assertEqual(u.data, "42")
self.assertIs(type(u.data), str)
def test_mixed_add(self):
u = UserString("spam") + "eggs"
self.assertEqual(u, "spameggs")
self.assertIs(type(u), UserString)
u = "spam" + UserString("eggs")
self.assertEqual(u, "spameggs")
self.assertIs(type(u), UserString)
u = UserString("spam") + UserStringSubclass("eggs")
self.assertEqual(u, "spameggs")
self.assertIs(type(u), UserString)
u = UserStringSubclass("spam") + UserString("eggs")
self.assertEqual(u, "spameggs")
self.assertIs(type(u), UserStringSubclass)
u = UserStringSubclass("spam") + UserStringSubclass2("eggs")
self.assertEqual(u, "spameggs")
self.assertIs(type(u), UserStringSubclass)
u2 = UserString("eggs").__radd__(UserString("spam"))
self.assertEqual(u2, "spameggs")
self.assertIs(type(u), UserStringSubclass)
u2 = UserStringSubclass("eggs").__radd__(UserStringSubclass2("spam"))
self.assertEqual(u2, "spameggs")
self.assertIs(type(u), UserStringSubclass)
def test_mixed_iadd(self):
u = UserString("spam")
u += "eggs"
self.assertEqual(u, "spameggs")
self.assertIs(type(u), UserString)
u = "spam"
u += UserString("eggs")
self.assertEqual(u, "spameggs")
self.assertIs(type(u), UserString)
u = UserString("spam")
u += UserStringSubclass("eggs")
self.assertEqual(u, "spameggs")
self.assertIs(type(u), UserString)
u = UserStringSubclass("spam")
u += UserString("eggs")
self.assertEqual(u, "spameggs")
self.assertIs(type(u), UserStringSubclass)
u = UserStringSubclass("spam")
u += UserStringSubclass2("eggs")
self.assertEqual(u, "spameggs")
self.assertIs(type(u), UserStringSubclass)
def test_mixed_cmp(self):
a = self.fixtype('ab')
self._assert_cmp(a, 'ab', 0)
self._assert_cmp(a, 'a', 1)
self._assert_cmp(a, 'ac', -1)
def test_rmod(self):
class ustr2(UserString):
pass
class ustr3(ustr2):
def __rmod__(self, other):
return super().__rmod__(other)
fmt2 = ustr2('value is %s')
str3 = ustr3('TEST')
self.assertEqual(fmt2 % str3, 'value is TEST')
def test_encode_default_args(self):
self.checkequal(b'hello', 'hello', 'encode')
# Check that encoding defaults to utf-8
self.checkequal(b'\xf0\xa3\x91\x96', '\U00023456', 'encode')
# Check that errors defaults to 'strict'
self.checkraises(UnicodeError, '\ud800', 'encode')
def test_encode_explicit_none_args(self):
self.checkequal(b'hello', 'hello', 'encode', None, None)
# Check that encoding defaults to utf-8
self.checkequal(b'\xf0\xa3\x91\x96', '\U00023456', 'encode', None, None)
# Check that errors defaults to 'strict'
self.checkraises(UnicodeError, '\ud800', 'encode', None, None)
def test_implementation(self):
s = UserString('ababahalamaha')
with support.swap_attr(UserString, '__iter__', None):
c = s.count('a')
c2 = s.count(UserString('a'))
self.assertEqual(c, 7)
self.assertEqual(c2, 7)
with (support.swap_attr(UserString, '__iter__', None),
support.swap_attr(UserString, '__getitem__', None)):
i = s.index('h')
i2 = s.index(UserString('h'))
self.assertEqual(i, 5)
self.assertEqual(i2, 5)
if __name__ == "__main__":
unittest.main()
|
