Parameters to significantly_different.py need to be parsed as lists.

scripts/slave/recipe_modules/auto_bisect/resources/significantly_different_test.py

 #!/usr/bin/env python
 """Tests for significantly_different."""
 
 import os
 import sys
 import unittest
 
 # pylint: disable=relative-import
 import significantly_different
 
@@ skipping 16 matching lines @@
           self.conda_path)
     except significantly_different.ScipyNotInstalledError:
       # This is meant to let presubmit pass on CQ bots :( because they don't
       # have scipy either directly or thorugh anaconda.
       return
 
     self.assertAlmostEqual(
         0.40073980338363635,
         results['mann_p_value'])
 
+  def test_single_value(self):
+    try:
+      results = significantly_different.main(
+          ['', '[1, 1, 1, 1, 1, 1]', '[1, 1, 1]', '0.05'],
+          self.conda_path)
+      self.assertIsNone(results['mann_p_value'])
+      self.assertFalse(results['significantly_different'])
+    except significantly_different.ScipyNotInstalledError:
+      # This is meant to let presubmit pass on CQ bots :( because they don't
+      # have scipy either directly or thorugh anaconda.
+      return
+
 if __name__ == '__main__':
   unittest.main()