git cl + git-numberer: add extra regression test case.

R=machenbach@chromium.org
BUG=chromium:642493,672043

Change-Id: Ie50637d6e01e40ddd15dcdfc1430c9554fa82976
Reviewed-on: https://chromium-review.googlesource.com/418715Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Andrii Shyshkalov <tandrii@chromium.org>

tests/git_cl_test.py

@@ -1242,7 +1242,7 @@ class TestGitCl(TestCase):
            'plugin.git-numberer.validate-disabled-refglob'],),
          'refs/heads/disabled\n'
          'refs/branch-heads/*\n'),
-    ] * 3  # 3 tests below have exactly same IO.
+    ] * 4  # 4 tests below have exactly same IO.
 
     res = git_cl._GitNumbererState.load(
         remote_url='https://chromium.googlesource.com/chromium/src',
@@ -1262,6 +1262,14 @@ class TestGitCl(TestCase):
     self.assertEqual(res.pending_prefix, None)
     self.assertEqual(res.should_git_number, False)
 
+    # Validator is disabled by default, even if it's not explicitely in disabled
+    # refglobs.
+    res = git_cl._GitNumbererState.load(
+        remote_url='https://chromium.googlesource.com/chromium/src',
+        remote_ref='refs/arbitrary/ref')
+    self.assertEqual(res.pending_prefix, None)
+    self.assertEqual(res.should_git_number, False)
+
   @classmethod
   def _gerrit_ensure_auth_calls(cls, issue=None, skip_auth_check=False):
     cmd = ['git', 'config', '--bool', 'gerrit.skip-ensure-authenticated']