# For testing http://bugs.python.org/issue8128

import test.test_support
import unittest

class MyUnicode(unicode):
    def __str__(self): return "Surprise!"

class MyStr(str):
    def __str__(self): return "Surprise!"

class InterpolationTest(unittest.TestCase):
    def test_str_interpolation(self):
        self.assertEquals('%s' % MyStr('some text'), 'Surprise!')
    def test_unicode_interpolation(self):
        self.assertEquals('%s' % MyUnicode('some text'), 'Surprise!')

def test_main():
    test.test_support.run_unittest(InterpolationTest)

if __name__ == "__main__":
    test_main()