CQ to always post a message when Commit box is unchecked.

verification/fake.py

Index: verification/fake.py
diff --git a/verification/fake.py b/verification/fake.py
index c38009e3de161acaedcf9f1ba07ec2e12016d73b..9b95854c46c876d7a1d84e851eb3819de87a9c92 100644
--- a/verification/fake.py
+++ b/verification/fake.py
@@ -6,6 +6,8 @@
 
 from verification import base
 
+def failed_message():
+  return 'FakeVerifier FAILED'
 
 class FakeVerifier(base.Verifier):
   name = 'fake'
@@ -15,7 +17,11 @@ class FakeVerifier(base.Verifier):
     self.state = state
 
   def verify(self, pending):
-    pending.verifications[self.name] = base.SimpleStatus(self.state)
+    fake = base.SimpleStatus(self.state)
+    # Make sure to leave a message, so CQ tests can reliably test for it.
+    if self.state == base.FAILED:
+      fake.error_message = failed_message()
+    pending.verifications[self.name] = fake
 
   def update_status(self, queue):
     pass
@@ -39,3 +45,6 @@ class DeferredFakeVerifier(base.Verifier):
 
     for _, fake in self.loop(queue, base.SimpleStatus, True):
       fake.state = self.state
+      # Make sure to leave a message, so CQ tests can reliably test for it.
+      if self.state == base.FAILED:
+        fake.error_message = failed_message()