1 files changed, 19 insertions, 0 deletions
diff --git a/tests/test_utils.py b/tests/test_utils.py
index 438de00..c6bca72 100644
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -1,3 +1,4 @@
+import sys
 import click
 
 
@@ -11,6 +12,24 @@ def test_echo(runner):
         bytes = out.getvalue()
         assert bytes == b'\xe2\x98\x83\nDD\n42ax'
 
+    # If we are on python 2 we expect that writing bytes into a string io
+    # does not do anything crazy.  On Python 3
+    if sys.version_info[0] == 2:
+        import StringIO
+        sys.stdout = x = StringIO.StringIO()
+        try:
+            click.echo('\xf6')
+        finally:
+            sys.stdout = sys.__stdout__
+        assert x.getvalue() == '\xf6\n'
+
+    # And in any case, if wrapped, we expect bytes to survive.
+    @click.command()
+    def cli():
+        click.echo(b'\xf6')
+    result = runner.invoke(cli, [])
+    assert result.output_bytes == b'\xf6\n'
+
 
 def test_filename_formatting():
     assert click.format_filename(b'foo.txt') == 'foo.txt'