Added filename format function

1 files changed, 9 insertions, 0 deletions

diff --git a/tests/test_utils.py b/tests/test_utils.py
index dd4d18d..42dcca2 100644
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -9,3 +9,12 @@ def test_echo(runner):
         click.echo(b'a', nl=False)
         bytes = out.getvalue()
         assert bytes == b'\xe2\x98\x83\nDD\n42a'
+
+
+def test_filename_formatting():
+    assert click.format_filename(b'foo.txt') == 'foo.txt'
+    assert click.format_filename(b'/x/foo.txt') == '/x/foo.txt'
+    assert click.format_filename(u'/x/foo.txt') == '/x/foo.txt'
+    assert click.format_filename(u'/x/foo.txt', shorten=True) == 'foo.txt'
+    assert click.format_filename('/x/foo\xff.txt', shorten=True) \
+        == u'foo\ufffd.txt'