Add a new test case and modify changelog.

CHANGES.rst

@@ -14,9 +14,12 @@ Unreleased
     stricter about header encodings than PEP 3333. (`#2766`_)
 -   Allow custom CLIs using ``FlaskGroup`` to set the debug flag without
     it always being overwritten based on environment variables. (`#2765`_)
+-   :func:`send_file` allows attachment filename as a ``bytes`` type that
+    contains unicode coded bytes. (`#2933`_)
 
 .. _#2766: https://github.com/pallets/flask/issues/2766
 .. _#2765: https://github.com/pallets/flask/pull/2765
+.. _#2933: https://github.com/pallets/flask/issues/2933
 
 
 Version 1.0.2

tests/test_helpers.py

@@ -644,6 +644,7 @@ class TestSendfile(object):
         (u'Ñandú／pingüino.txt', '"Nandu/pinguino.txt"',
         '%C3%91and%C3%BA%EF%BC%8Fping%C3%BCino.txt'),
         (u'Vögel.txt', 'Vogel.txt', 'V%C3%B6gel.txt'),
+        ('tést.txt', 'test.txt', 't%C3%A9st.txt'),
     ))
     def test_attachment_filename_encoding(self, filename, ascii, utf8):
         rv = flask.send_file('static/index.html', as_attachment=True, attachment_filename=filename)