diff --git a/tests/basics/bytearray1.py b/tests/basics/bytearray1.py
index 2e47f17bf956d0fc4d76215503ded11c51180327..b598500264fbea39572afb571cd611b1a9fb4f8b 100644
--- a/tests/basics/bytearray1.py
+++ b/tests/basics/bytearray1.py
@@ -31,3 +31,9 @@ print(bytearray() == bytearray())
 print(bytearray() == 1)
 
 # TODO: other comparisons
+
+# __contains__
+b = bytearray(b"\0foo\0")
+print(b"foo" in b)
+print(b"foo\x01" in b)
+print(b"" in b)