Raising error on conflicting args

certbot/main.py

@@ -669,6 +669,16 @@ def main(cli_args=sys.argv[1:]):
 
     sys.excepthook = functools.partial(_handle_exception, config=config)
 
+    # Avoid conflicting args
+    conficting_args = ["quiet", "noninteractive_mode", "text_mode"]
+    if config.dialog_mode:
+        for arg in conficting_args:
+            if getattr(config, arg):
+                raise errors.Error(
+                    ("Conflicting values for displayer."
+                    " {0} conflicts with dialog_mode").format(arg)
+                )
+
     # Displayer
     if config.quiet:
         config.noninteractive_mode = True

certbot/tests/cli_test.py

@@ -49,7 +49,7 @@ class CLITest(unittest.TestCase):  # pylint: disable=too-many-public-methods
         self.logs_dir = os.path.join(self.tmp_dir, 'logs')
         self.standard_args = ['--config-dir', self.config_dir,
                               '--work-dir', self.work_dir,
-                              '--logs-dir', self.logs_dir, '--text']
+                              '--logs-dir', self.logs_dir]
 
     def tearDown(self):
         shutil.rmtree(self.tmp_dir)