diff --git a/Lib/test/test_unittest.py b/Lib/test/test_unittest.py
index 459334b..de687e2 100644
--- a/Lib/test/test_unittest.py
+++ b/Lib/test/test_unittest.py
@@ -2500,6 +2500,18 @@
         self.assertIsNot(thing, object())
         self.assertRaises(self.failureException, self.assertIsNot, thing, thing)
 
+    def testAssertIsInstance(self):
+        thing = []
+        self.assertIsInstance(thing, list)
+        self.assertRaises(self.failureException, self.assertIsInstance,
+                          thing, dict)
+
+    def testAssertNotIsInstance(self):
+        thing = []
+        self.assertNotIsInstance(thing, dict)
+        self.assertRaises(self.failureException, self.assertNotIsInstance,
+                          thing, list)
+
     def testAssertIn(self):
         animals = {'monkey': 'banana', 'cow': 'grass', 'seal': 'fish'}