Add a test for key with os_sorted

1 files changed, 6 insertions, 0 deletions

diff --git a/tests/test_os_sorted.py b/tests/test_os_sorted.py
index aaaffac..2c38d9c 100644
--- a/tests/test_os_sorted.py
+++ b/tests/test_os_sorted.py
@@ -40,6 +40,12 @@ def test_os_sorted_misc_no_fail():
     natsort.os_sorted([9, 4.3, None, float("nan")])
 
 
+def test_os_sorted_key():
+    given = expected = ["foo0", "goo1", "foo2"]
+    result = natsort.os_sorted(given, key=lambda x: x.replace("g", "f"))
+    assert result == expected
+
+
 # The following is a master list of things that might give trouble
 # when sorting like the file explorer.
 given = [