Index: Lib/test/test_grammar.py
===================================================================
--- Lib/test/test_grammar.py	(revision 80100)
+++ Lib/test/test_grammar.py	(working copy)
@@ -500,7 +500,25 @@
         else:
             if __debug__:
                 self.fail("AssertionError not raised by assert 0")
+        
+        try:
+            assert False
+        except AssertionError as e:
+            self.assertEqual(str(e), "")
+        else:
+            if __debug__:
+                self.fail("AssertionError not raised by 'assert False'")
+        
+        try:
+            assert True
+        except AssertionError as e:
+            self.fail("'assert True' should not have raised an AssertionError")
 
+        try:
+            assert True, 'this should always pass'
+        except AssertionError as e:
+            self.fail("'assert True, msg' should not have raised an AssertionError")
+    
     ### compound_stmt: if_stmt | while_stmt | for_stmt | try_stmt | funcdef | classdef
     # Tested below