#6780: fix starts/endswith error message to mention that tuples are accepted too.

1 files changed, 12 insertions, 1 deletions

diff --git a/Lib/test/test_str.py b/Lib/test/test_str.py
index 4f88b28848..2ecf3276b4 100644
--- a/Lib/test/test_str.py
+++ b/Lib/test/test_str.py
@@ -414,7 +414,18 @@ class StrTest(
         self.assertEqual('Andr\202 x'.decode('ascii', 'replace'),
                          'Andr\202 x'.decode(encoding='ascii', errors='replace'))
 
-
+    def test_startswith_endswith_errors(self):
+        with self.assertRaises(UnicodeDecodeError):
+            '\xff'.startswith(u'x')
+        with self.assertRaises(UnicodeDecodeError):
+            '\xff'.endswith(u'x')
+        for meth in ('foo'.startswith, 'foo'.endswith):
+            with self.assertRaises(TypeError) as cm:
+                meth(['f'])
+            exc = str(cm.exception)
+            self.assertIn('unicode', exc)
+            self.assertIn('str', exc)
+            self.assertIn('tuple', exc)
 
 def test_main():
     test_support.run_unittest(StrTest)