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#!/usr/bin/env python
# UserString is a wrapper around the native builtin string type.
# UserString instances should behave similar to builtin string objects.
import unittest
from test import test_support, string_tests
from UserString import UserString, MutableString
class UserStringTest(
string_tests.CommonTest,
string_tests.MixinStrUnicodeUserStringTest,
):
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):
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)
self.assertEqual(
result,
realresult
)
def checkraises(self, exc, object, methodname, *args):
object = self.fixtype(object)
# we don't fix the arguments, because UserString can't cope with it
self.assertRaises(
exc,
getattr(object, methodname),
*args
)
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)
class MutableStringTest(UserStringTest):
type2test = MutableString
# MutableStrings can be hashed => deactivate test
def test_hash(self):
pass
def test_setitem(self):
s = self.type2test("foo")
self.assertRaises(IndexError, s.__setitem__, -4, "bar")
self.assertRaises(IndexError, s.__setitem__, 3, "bar")
s[-1] = "bar"
self.assertEqual(s, "fobar")
s[0] = "bar"
self.assertEqual(s, "barobar")
def test_delitem(self):
s = self.type2test("foo")
self.assertRaises(IndexError, s.__delitem__, -4)
self.assertRaises(IndexError, s.__delitem__, 3)
del s[-1]
self.assertEqual(s, "fo")
del s[0]
self.assertEqual(s, "o")
del s[0]
self.assertEqual(s, "")
def test_setslice(self):
s = self.type2test("foo")
s[:] = "bar"
self.assertEqual(s, "bar")
s[1:2] = "foo"
self.assertEqual(s, "bfoor")
s[1:-1] = UserString("a")
self.assertEqual(s, "bar")
s[0:10] = 42
self.assertEqual(s, "42")
def test_delslice(self):
s = self.type2test("foobar")
del s[3:10]
self.assertEqual(s, "foo")
del s[-1:10]
self.assertEqual(s, "fo")
def test_immutable(self):
s = self.type2test("foobar")
s2 = s.immutable()
self.assertEqual(s, s2)
self.assert_(isinstance(s2, UserString))
def test_iadd(self):
s = self.type2test("foo")
s += "bar"
self.assertEqual(s, "foobar")
s += UserString("baz")
self.assertEqual(s, "foobarbaz")
s += 42
self.assertEqual(s, "foobarbaz42")
def test_imul(self):
s = self.type2test("foo")
s *= 1
self.assertEqual(s, "foo")
s *= 2
self.assertEqual(s, "foofoo")
s *= -1
self.assertEqual(s, "")
def test_main():
test_support.run_unittest(UserStringTest, MutableStringTest)
if __name__ == "__main__":
test_main()
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