Added a test to ensure that sudo is only used if remote and become user difer.

test/units/plugins/action/test_action.py

+# (c) 2015, Florian Apolloner <florian@apolloner.eu>
+#
+# This file is part of Ansible
+#
+# Ansible is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# Ansible is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
+
+# Make coding more python3-ish
+from __future__ import (absolute_import, division, print_function)
+__metaclass__ = type
+
+
+from ansible.compat.tests import unittest
+from ansible.compat.tests.mock import Mock
+from ansible.playbook.play_context import PlayContext
+from ansible.plugins.action import ActionBase
+
+
+class TestActionBase(unittest.TestCase):
+
+    def test_sudo_only_if_user_differs(self):
+        play_context = PlayContext()
+        action_base = ActionBase(None, None, play_context, None, None, None)
+        action_base._connection = Mock(exec_command=Mock(return_value=(0, '', '', '')))
+
+        play_context.become = True
+        play_context.become_user = play_context.remote_user = 'root'
+        play_context.make_become_cmd = Mock(return_value='CMD')
+
+        action_base._low_level_execute_command('ECHO', '/tmp', sudoable=True)
+        play_context.make_become_cmd.assert_not_called()
+
+        play_context.remote_user = 'apo'
+        action_base._low_level_execute_command('ECHO', '/tmp', sudoable=True)
+        play_context.make_become_cmd.assert_called_once_with('ECHO', executable=None)