diff --git a/test13.py b/test13.py
new file mode 100644
index 0000000..5c49a40
--- /dev/null
+++ b/test13.py
@@ -0,0 +1,34 @@
+from test12 import BoundedInt
+
+class BoundedIntTester:
+    def __init__(self):
+        pass
+    def test1(self):
+        bi1 = BoundedInt(0xdeadbeef, max = 0, min = 10)
+        if int(bi1) == 0xdeadbeef:
+            print(f"✅ Test 1 passed!")
+        else:
+            print(f"❌ Test 1 failed, int(bi1) = {int(bi1)}, expected 0xdeadbeef")
+
+    def test2(self):
+        bi2 = BoundedInt(1, min = 0, max = 1)
+        bi3 = BoundedInt(1, min = 0, max = 1)
+        try:
+            bi4 = bi2 + bi3 # 1 + 1 = 2, which is more than max = 1
+            print(f"❌ Test 2 failed!")
+        except ValueError as err:
+            print(f"✅ Test 2 passed!")
+
+    def test3(self):
+        bi4 = BoundedInt(1, min = 0, max = 1)
+        bi5 = BoundedInt(2, min = 0, max = 1)
+        try:
+            bi6 = bi4 - bi5 # 1 - 2 = (-1), which is less than min = 0
+            print(f"❌ Test 3 failed!")
+        except ValueError as err:
+            print(f"✅ Test 3 passed!")
+
+tester = BoundedIntTester()
+tester.test1()
+tester.test2()
+tester.test3()
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