Mock keystone call to avoid test failure

The test test_password_prompted() was expecting a keystone failure, but
because of an error in the requests/urllib3 library it was returning a
different exception and causing our tests to fail, see[1].

Independent of the the problem above on tests we should not rely on some
external library failing like that, we should mock this failures to make
our tests more reliable and that's what this patch is doing.

[1] https://bugs.launchpad.net/ospurge/+bug/1503768

Change-Id: I3e6091eb2bc221a16fdc18b998ba138058818894
Closes-Bug: #1504197
(cherry picked from commit 42d52af3c2)

ironicclient/tests/unit/test_shell.py

@@ -119,13 +119,28 @@ class ShellTest(utils.BaseTestCase):
         self.make_env(exclude='OS_USERNAME')
         self.test_help()
 
+    @mock.patch.object(ironic_shell.IronicShell, '_get_keystone_auth',
+                       side_effect=keystone_exc.ConnectionRefused)
     @mock.patch('sys.stdin', side_effect=mock.MagicMock)
     @mock.patch('getpass.getpass', return_value='password')
-    def test_password_prompted(self, mock_getpass, mock_stdin):
+    def test_password_prompted(self, mock_getpass, mock_stdin, mock_ks):
         self.make_env(exclude='OS_PASSWORD')
         # We will get a Connection Refused because there is no keystone.
         self.assertRaises(keystone_exc.ConnectionRefused,
                           self.shell, 'node-list')
+        expected_kwargs = {
+            'username': FAKE_ENV['OS_USERNAME'],
+            'user_domain_id': '',
+            'user_domain_name': '',
+            'password': FAKE_ENV['OS_PASSWORD'],
+            'auth_token': '',
+            'project_id': '',
+            'project_name': FAKE_ENV['OS_TENANT_NAME'],
+            'project_domain_id': '',
+            'project_domain_name': '',
+        }
+        mock_ks.assert_called_once_with(mock.ANY, FAKE_ENV['OS_AUTH_URL'],
+                                        **expected_kwargs)
         # Make sure we are actually prompted.
         mock_getpass.assert_called_with('OpenStack Password: ')