diff --git a/testing/tools/run_corpus_tests.py b/testing/tools/run_corpus_tests.py
index c7ff605..dd81a27 100755
--- a/testing/tools/run_corpus_tests.py
+++ b/testing/tools/run_corpus_tests.py
@@ -9,7 +9,7 @@
 
 def main():
   runner = test_runner.TestRunner('corpus')
-  runner.Run()
+  return runner.Run()
 
 if __name__ == '__main__':
   sys.exit(main())
diff --git a/testing/tools/run_javascript_tests.py b/testing/tools/run_javascript_tests.py
index 2f46882..76d2379 100755
--- a/testing/tools/run_javascript_tests.py
+++ b/testing/tools/run_javascript_tests.py
@@ -9,7 +9,7 @@
 
 def main():
   runner = test_runner.TestRunner('javascript')
-  runner.Run()
+  return runner.Run()
 
 if __name__ == '__main__':
   sys.exit(main())
diff --git a/testing/tools/run_pixel_tests.py b/testing/tools/run_pixel_tests.py
index cb1b42d..aad39c5 100755
--- a/testing/tools/run_pixel_tests.py
+++ b/testing/tools/run_pixel_tests.py
@@ -9,7 +9,7 @@
 
 def main():
   runner = test_runner.TestRunner('pixel')
-  runner.Run()
+  return runner.Run()
 
 if __name__ == '__main__':
   sys.exit(main())