Index: lldb/packages/Python/lldbsuite/test/lldbtest.py
===================================================================
--- lldb/packages/Python/lldbsuite/test/lldbtest.py
+++ lldb/packages/Python/lldbsuite/test/lldbtest.py
@@ -2421,8 +2421,7 @@
         eval_result = frame.EvaluateExpression(expr, options)
 
         if error_msg:
-            self.assertFalse(eval_result.IsValid(), "Unexpected success with result: '" + str(eval_result) + "'")
-            self.assertEqual(error_msg, eval_result.GetError().GetCString())
+            self.assertTrue(eval_result.GetError().GetCString().find(error_msg) != -1)
             return
 
         if not eval_result.GetError().Success():