diff -ru ../avocado-52.1.orig/selftests/functional/test_plugin_diff.py ./selftests/functional/test_plugin_diff.py
--- ../avocado-52.1.orig/selftests/functional/test_plugin_diff.py	2018-03-01 12:05:02.000000000 -0600
+++ ./selftests/functional/test_plugin_diff.py	2018-03-13 16:50:33.662490323 -0500
@@ -52,9 +52,9 @@
         result = self.run_and_check(cmd_line, expected_rc)
         msg = "# COMMAND LINE"
         self.assertIn(msg, result.stdout)
-        msg = "-./scripts/avocado run"
+        msg = "-%s run" % AVOCADO
         self.assertIn(msg, result.stdout)
-        msg = "+./scripts/avocado run"
+        msg = "+%s run" % AVOCADO
         self.assertIn(msg, result.stdout)
 
     def test_diff_nocmdline(self):