VMware: Fix module usages in module_utils

Added unit tests for vmware.py

Signed-off-by: Abhijeet Kasurde <akasurde@redhat.com>

changelogs/fragments/47313-vmware-fix_module_error.yaml

@@ -0,0 +1,3 @@
+---
+bugfixes:
+  - Fix VMware module utils for self usage.

lib/ansible/module_utils/vmware.py

@@ -774,8 +774,8 @@ def __init__(self, module):
         Constructor
         """
         if not HAS_REQUESTS:
-            self.module.fail_json(msg="Unable to find 'requests' Python library which is required."
-                                      " Please install using 'pip install requests'")
+            module.fail_json(msg="Unable to find 'requests' Python library which is required."
+                                 " Please install using 'pip install requests'")
 
         if not HAS_PYVMOMI:
             module.fail_json(msg='PyVmomi Python module required. Install using "pip install PyVmomi"')

test/units/module_utils/test_vmware.py

@@ -0,0 +1,52 @@
+# Copyright: (c) 2018, Ansible Project
+# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
+
+import sys
+
+from units.compat import unittest
+from units.compat.mock import patch, MagicMock
+
+from ansible.module_utils.six.moves import builtins
+from ansible.module_utils._text import to_native
+
+realimport = builtins.__import__
+
+
+class TestVmware(unittest.TestCase):
+    def clear_modules(self, mods):
+        for mod in mods:
+            if mod in sys.modules:
+                del sys.modules[mod]
+
+    @patch.object(builtins, '__import__')
+    def test_vmware_missing_ensure_libs(self, mock_import):
+        def _mock_import(name, *args, **kwargs):
+            if name in ('pyVmomi', 'requests'):
+                raise ImportError
+            return realimport(name, *args, **kwargs)
+
+        self.clear_modules(['pyVmomi', 'ansible.module_utils.vmware', 'requests'])
+        mock_import.side_effect = _mock_import
+        mod = builtins.__import__('ansible.module_utils.vmware')
+
+        self.assertFalse(mod.module_utils.vmware.HAS_PYVMOMI)
+        self.assertFalse(mod.module_utils.vmware.HAS_REQUESTS)
+
+        with self.assertRaises(NameError) as context:
+            mod.module_utils.vmware.PyVmomi(MagicMock())
+
+        self.assertIn("name 'vim' is not defined", to_native(context.exception))
+
+    @patch.object(builtins, '__import__')
+    def test_vmware_found_ensure_libs(self, mock_import):
+        def _mock_import(name, *args, **kwargs):
+            if 'pyVmomi' in name:
+                return MagicMock()
+            return realimport(name, *args, **kwargs)
+
+        self.clear_modules(['pyVmomi', 'ansible.module_utils.vmware', 'requests'])
+        mock_import.side_effect = _mock_import
+        mod = builtins.__import__('ansible.module_utils.vmware')
+
+        self.assertTrue(mod.module_utils.vmware.HAS_PYVMOMI)
+        self.assertTrue(mod.module_utils.vmware.HAS_REQUESTS)