def test_one_double_wide_character(self):
self.assertEqual(strcrop('123／456', 0), '')
self.assertEqual(strcrop('123／456', 1), '1')
self.assertEqual(strcrop('123／456', 2), '12')
self.assertEqual(strcrop('123／456', 3), '123')
self.assertEqual(strcrop('123／456', 4), '123')
self.assertEqual(strcrop('123／456', 5), '123／')
self.assertEqual(strcrop('123／456', 6), '123／4')
self.assertEqual(strcrop('123／456', 7), '123／45')
self.assertEqual(strcrop('123／456', 8), '123／456')
self.assertEqual(strcrop('123／456', 9), '123／456')
def test_multiple_double_wide_characters(self):
self.assertEqual(strcrop('ツ123／456ツ', 100), 'ツ123／456ツ')
self.assertEqual(strcrop('ツ123／456ツ', 1), '')
self.assertEqual(strcrop('ツ123／456ツ', 2), 'ツ')
self.assertEqual(strcrop('ツ123／456ツ', 3), 'ツ1')
self.assertEqual(strcrop('ツ123／456ツ', 4), 'ツ12')
self.assertEqual(strcrop('ツ123／456ツ', 5), 'ツ123')
self.assertEqual(strcrop('ツ123／456ツ', 6), 'ツ123')
self.assertEqual(strcrop('ツ123／456ツ', 7), 'ツ123／')
self.assertEqual(strcrop('ツ123／456ツ', 8), 'ツ123／4')
self.assertEqual(strcrop('ツ123／456ツ', 9), 'ツ123／45')
self.assertEqual(strcrop('ツ123／456ツ', 10), 'ツ123／456')
self.assertEqual(strcrop('ツ123／456ツ', 11), 'ツ123／456')
self.assertEqual(strcrop('ツ123／456ツ', 12), 'ツ123／456ツ')
self.assertEqual(strcrop('ツ123／456ツ', 13), 'ツ123／456ツ')
def test_ascii_string(self):
self.assertEqual(strcrop('123456', 100), '123456')
self.assertEqual(strcrop('123456', 3), '123')
self.assertEqual(strcrop('123456', 0), '')
def test_empty_string(self):
self.assertEqual(strcrop('', 0), '')
self.assertEqual(strcrop('', 100), '')