diff --git a/tests/test_set.py b/tests/test_set.py
index d6327e2..e9549be 100644
--- a/tests/test_set.py
+++ b/tests/test_set.py
@@ -7,6 +7,12 @@ def test_ordered_set():
     assert 1 in ordered_set
     assert bool(ordered_set)
 
+    ordered_set.add(1)
+    assert 1 in ordered_set
+
+    ordered_set.remove(1)
+    assert 1 not in ordered_set
+
     for i in range(4):
         ordered_set.discard(i)
-    assert not bool(ordered_set)
+    assert not bool(ordered_set)
\ No newline at end of file