diff --git a/tests/basics/bytearray1.py b/tests/basics/bytearray1.py
index 2e47f17bf..b59850026 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)