add sleep for timing issue

Author: ko1

test/protocol/eval_test.rb

@@ -41,7 +41,7 @@ def test_eval_executes_commands
 
   class EvaluateOnSomeFramesTest < ProtocolTestCase
     PROGRAM = <<~RUBY
-      1| a = 2
+      1| a = 2; sleep 0.1
       2| def foo
       3|   a = 4
       4| end