diff --git a/testing/tools/run_corpus_tests.py b/testing/tools/run_corpus_tests.py
index dbc8f35..ba014d4 100755
--- a/testing/tools/run_corpus_tests.py
+++ b/testing/tools/run_corpus_tests.py
@@ -73,11 +73,13 @@
                failures.append(input_path)
 
   if surprises:
+    surprise.sort()
     print '\n\nUnexpected Successes:'
     for surprise in surprises:
       print surprise;
 
   if failures:
+    failures.sort()
     print '\n\nSummary of Failures:'
     for failure in failures:
       print failure
diff --git a/testing/tools/run_javascript_tests.py b/testing/tools/run_javascript_tests.py
index ff66d9c..f9344a1 100755
--- a/testing/tools/run_javascript_tests.py
+++ b/testing/tools/run_javascript_tests.py
@@ -66,6 +66,7 @@
           failures.append(input_path)
 
   if failures:
+    failures.sort()
     print '\n\nSummary of Failures:'
     for failure in failures:
       print failure
diff --git a/testing/tools/run_pixel_tests.py b/testing/tools/run_pixel_tests.py
index 1688462..98e8916 100755
--- a/testing/tools/run_pixel_tests.py
+++ b/testing/tools/run_pixel_tests.py
@@ -70,6 +70,7 @@
           failures.append(input_path)
 
   if failures:
+    failures.sort()
     print '\n\nSummary of Failures:'
     for failure in failures:
       print failure