Add a test to verify that all important blueprints have all their methods decorated

This ensures that we don't accidentally add a blueprint method without either explicitly blacklisting or whitelisting anonymous access

test/test_anon_checked.py

@@ -0,0 +1,33 @@
+import unittest
+
+from endpoints.tags import tags
+from endpoints.registry import registry
+from endpoints.index import index
+from endpoints.verbs import verbs
+
+
+class TestAnonymousAccessChecked(unittest.TestCase):
+  def verifyBlueprint(self, blueprint):
+    class Checker(object):
+      def __init__(self, test_case):
+        self.test_case = test_case
+
+      def add_url_rule(self, rule, endpoint, view_function, methods=None):
+        if (not '__anon_protected' in dir(view_function) and
+            not '__anon_allowed' in dir(view_function)):
+          error_message = ('Missing anonymous access protection decorator on function ' +
+                           '%s under blueprint %s' % (endpoint, blueprint.name))
+          self.test_case.fail(error_message)
+
+    for deferred_function in blueprint.deferred_functions:
+      deferred_function(Checker(self))
+
+  def test_anonymous_access_checked(self):
+    self.verifyBlueprint(tags)
+    self.verifyBlueprint(registry)
+    self.verifyBlueprint(index)
+    self.verifyBlueprint(verbs)
+
+if __name__ == '__main__':
+  unittest.main()
+