use assert[Not]IsInstance where appropriate
diff --git a/Lib/test/test_bytes.py b/Lib/test/test_bytes.py
index a72e8de..aab51da 100644
--- a/Lib/test/test_bytes.py
+++ b/Lib/test/test_bytes.py
@@ -970,7 +970,7 @@
 
     def test_basic(self):
         self.assertTrue(issubclass(ByteArraySubclass, bytearray))
-        self.assertTrue(isinstance(ByteArraySubclass(), bytearray))
+        self.assertIsInstance(ByteArraySubclass(), bytearray)
 
         a, b = b"abcd", b"efgh"
         _a, _b = ByteArraySubclass(a), ByteArraySubclass(b)