diff -r 57b0c7221dba -r 3ea3c96ada54 tests/test-encoding-func.py
--- a/tests/test-encoding-func.py	Sun Apr 22 11:38:53 2018 +0900
+++ b/tests/test-encoding-func.py	Sun Apr 23 13:15:30 2017 +0900
@@ -53,6 +53,13 @@
         self.assertEqual(l, b'?')  # lossy
         self.assertEqual(s, encoding.toutf8b(l))  # utf8 sequence preserved
 
+    def testlosslesslatin(self):
+        encoding.encoding = b'latin-1'
+        s = u'\xc0'.encode('utf-8')
+        l = encoding.tolocal(s)
+        self.assertEqual(l, b'\xc0')  # lossless
+        self.assertEqual(s, encoding.toutf8b(l))  # convert back to utf-8
+
     def testlossy0xed(self):
         encoding.encoding = b'euc-kr'  # U+Dxxx Hangul
         s = u'\ud1bc\xc0'.encode('utf-8')
@@ -61,6 +68,13 @@
         self.assertTrue(l.endswith(b'?'))  # lossy
         self.assertEqual(s, encoding.toutf8b(l))  # utf8 sequence preserved
 
+    def testlossless0xed(self):
+        encoding.encoding = b'euc-kr'  # U+Dxxx Hangul
+        s = u'\ud1bc'.encode('utf-8')
+        l = encoding.tolocal(s)
+        self.assertEqual(l, b'\xc5\xed')  # lossless
+        self.assertEqual(s, encoding.toutf8b(l))  # convert back to utf-8
+
 if __name__ == '__main__':
     import silenttestrunner
     silenttestrunner.main(__name__)