diff --git a/tests/basics/deque1.py b/tests/basics/deque1.py
index ee51516b5..6b5669c45 100644
--- a/tests/basics/deque1.py
+++ b/tests/basics/deque1.py
@@ -45,3 +45,18 @@ try:
     d.popleft()
 except IndexError:
     print("IndexError")
+
+# Case where get index wraps around when appending to full deque
+d = deque((), 2)
+d.append(1)
+d.append(2)
+d.append(3)
+d.append(4)
+d.append(5)
+print(d.popleft(), d.popleft())
+
+# Unsupported unary op
+try:
+    ~d
+except TypeError:
+    print("TypeError")
diff --git a/tests/basics/sys_getsizeof.py b/tests/basics/sys_getsizeof.py
index d16eb1561..fe1b403e0 100644
--- a/tests/basics/sys_getsizeof.py
+++ b/tests/basics/sys_getsizeof.py
@@ -13,3 +13,10 @@ print(sys.getsizeof({1: 2}) >= 2)
 class A:
     pass
 print(sys.getsizeof(A()) > 0)
+
+# Only test deque if we have it
+try:
+    from ucollections import deque
+    assert sys.getsizeof(deque((), 1)) > 0
+except ImportError:
+    pass