Add output_test assertion for quiet without 'no work to do'

Author: taminob

misc/output_test.py

@@ -133,6 +133,7 @@ def test_pr_1685(self):
     def test_status(self):
         self.assertEqual(run(''), 'ninja: no work to do.\n')
         self.assertEqual(run('', pipe=True), 'ninja: no work to do.\n')
+        self.assertEqual(run('', flags='--quiet'), '')
 
     def test_ninja_status_default(self):
         'Do we show the default status by default?'