adding qemu_nbd unit test

tests/unit/modules/qemu_nbd_test.py

@@ -0,0 +1,113 @@
+# -*- coding: utf-8 -*-
+'''
+    :codeauthor: :email:`Jayesh Kariya <jayeshk@saltstack.com>`
+'''
+
+# Import Python Libs
+from __future__ import absolute_import
+import os.path
+import glob
+
+# Import Salt Testing Libs
+from salttesting import TestCase, skipIf
+from salttesting.mock import (
+    MagicMock,
+    patch,
+    NO_MOCK,
+    NO_MOCK_REASON
+)
+
+from salttesting.helpers import ensure_in_syspath
+
+ensure_in_syspath('../../')
+
+# Import Salt Libs
+from salt.modules import qemu_nbd
+
+qemu_nbd.__salt__ = {}
+
+
+@skipIf(NO_MOCK, NO_MOCK_REASON)
+class QemuNbdTestCase(TestCase):
+    '''
+    Test cases for salt.modules.qemu_nbd
+    '''
+    # 'connect' function tests: 1
+
+    def test_connect(self):
+        '''
+        Test if it activate nbd for an image file.
+        '''
+        mock = MagicMock(return_value=True)
+        with patch.dict(qemu_nbd.__salt__, {'cmd.run': mock}):
+            with patch.object(os.path, 'isfile',
+                              MagicMock(return_value=False)):
+                self.assertEqual(qemu_nbd.connect('/tmp/image.raw'), '')
+                self.assertEqual(qemu_nbd.connect('/tmp/image.raw'), '')
+
+        with patch.object(os.path, 'isfile', mock):
+            with patch.object(glob, 'glob',
+                              MagicMock(return_value=['/dev/nbd0'])):
+                with patch.dict(qemu_nbd.__salt__,
+                                {'cmd.run': mock,
+                                 'cmd.retcode': MagicMock(side_effect=[1, 0])}):
+                    self.assertEqual(qemu_nbd.connect('/tmp/image.raw'),
+                                     '/dev/nbd0')
+
+                with patch.dict(qemu_nbd.__salt__,
+                                {'cmd.run': mock,
+                                 'cmd.retcode': MagicMock(return_value=False)}):
+                    self.assertEqual(qemu_nbd.connect('/tmp/image.raw'), '')
+
+    # 'mount' function tests: 1
+
+    def test_mount(self):
+        '''
+        Test if it pass in the nbd connection device location,
+        mount all partitions and return a dict of mount points.
+        '''
+        mock = MagicMock(return_value=True)
+        with patch.dict(qemu_nbd.__salt__, {'cmd.run': mock}):
+            self.assertDictEqual(qemu_nbd.mount('/dev/nbd0'), {})
+
+    # 'init' function tests: 1
+
+    def test_init(self):
+        '''
+        Test if it mount the named image via qemu-nbd
+        and return the mounted roots
+        '''
+        mock = MagicMock(return_value=True)
+        with patch.dict(qemu_nbd.__salt__, {'cmd.run': mock}):
+            self.assertEqual(qemu_nbd.init('/srv/image.qcow2'), '')
+
+        with patch.object(os.path, 'isfile', mock):
+            with patch.object(glob, 'glob',
+                              MagicMock(return_value=['/dev/nbd0'])):
+                with patch.dict(qemu_nbd.__salt__,
+                                {'cmd.run': mock,
+                                 'mount.mount': mock,
+                                 'cmd.retcode': MagicMock(side_effect=[1, 0])}):
+                    self.assertDictEqual(qemu_nbd.init('/srv/image.qcow2'),
+                                         {'/tmp/nbd/nbd0/nbd0': '/dev/nbd0'})
+
+    # 'clear' function tests: 1
+
+    def test_clear(self):
+        '''
+        Test if it pass in the mnt dict returned from nbd_mount
+        to unmount and disconnect the image from nbd.
+        '''
+        mock_run = MagicMock(return_value=True)
+        with patch.dict(qemu_nbd.__salt__,
+                        {'cmd.run': mock_run,
+                         'mount.umount': MagicMock(side_effect=[False, True])}):
+            self.assertDictEqual(qemu_nbd.clear({"/mnt/foo": "/dev/nbd0p1"}),
+                                 {'/mnt/foo': '/dev/nbd0p1'})
+            self.assertDictEqual(qemu_nbd.clear({"/mnt/foo": "/dev/nbd0p1"}),
+                                 {})
+
+
+if __name__ == '__main__':
+    from integration import run_tests
+    run_tests(QemuNbdTestCase, needs_daemon=False)