diff --git a/changelogs/fragments/47313-vmware-fix_module_error.yaml b/changelogs/fragments/47313-vmware-fix_module_error.yaml
new file mode 100644
index 00000000000..7a186d24668
--- /dev/null
+++ b/changelogs/fragments/47313-vmware-fix_module_error.yaml
@@ -0,0 +1,4 @@
+---
+bugfixes:
+  - Fix VMware module utils for self usage.
+  - Added unit test for VMware module_utils.
diff --git a/lib/ansible/module_utils/vmware.py b/lib/ansible/module_utils/vmware.py
index f2b5dc983e7..642ff1e57b2 100644
--- a/lib/ansible/module_utils/vmware.py
+++ b/lib/ansible/module_utils/vmware.py
@@ -742,8 +742,8 @@ class PyVmomi(object):
         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"')
diff --git a/test/units/module_utils/test_vmware.py b/test/units/module_utils/test_vmware.py
new file mode 100644
index 00000000000..56b327f7de8
--- /dev/null
+++ b/test/units/module_utils/test_vmware.py
@@ -0,0 +1,134 @@
+# -*- coding: utf-8 -*-
+# Copyright: (c) 2018, Ansible Project
+# Copyright: (c) 2018, Abhijeet Kasurde <akasurde@redhat.com>
+# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
+
+from __future__ import absolute_import, division, print_function
+__metaclass__ = type
+
+import sys
+import pytest
+
+pyvmomi = pytest.importorskip('PyVmomi')
+
+from ansible.module_utils.vmware import connect_to_api, PyVmomi
+
+
+test_data = [
+    (
+        dict(
+            username='Administrator@vsphere.local',
+            password='Esxi@123$%',
+            hostname=False,
+            validate_certs=False,
+        ),
+        "Hostname parameter is missing. Please specify this parameter in task or"
+        " export environment variable like 'export VMWARE_HOST=ESXI_HOSTNAME'"
+    ),
+    (
+        dict(
+            username=False,
+            password='Esxi@123$%',
+            hostname='esxi1',
+            validate_certs=False,
+        ),
+        "Username parameter is missing. Please specify this parameter in task or"
+        " export environment variable like 'export VMWARE_USER=ESXI_USERNAME'"
+    ),
+    (
+        dict(
+            username='Administrator@vsphere.local',
+            password=False,
+            hostname='esxi1',
+            validate_certs=False,
+        ),
+        "Password parameter is missing. Please specify this parameter in task or"
+        " export environment variable like 'export VMWARE_PASSWORD=ESXI_PASSWORD'"
+    ),
+    (
+        dict(
+            username='Administrator@vsphere.local',
+            password='Esxi@123$%',
+            hostname='esxi1',
+            validate_certs=True,
+        ),
+        "Unknown error while connecting to vCenter or ESXi API at esxi1:443"
+    ),
+]
+
+
+class AnsibleModuleExit(Exception):
+    def __init__(self, *args, **kwargs):
+        self.args = args
+        self.kwargs = kwargs
+
+
+class ExitJson(AnsibleModuleExit):
+    pass
+
+
+class FailJson(AnsibleModuleExit):
+    pass
+
+
+@pytest.fixture
+def fake_ansible_module():
+    return FakeAnsibleModule()
+
+
+class FakeAnsibleModule:
+    def __init__(self):
+        self.params = {}
+        self.tmpdir = None
+
+    def exit_json(self, *args, **kwargs):
+        raise ExitJson(*args, **kwargs)
+
+    def fail_json(self, *args, **kwargs):
+        raise FailJson(*args, **kwargs)
+
+
+def test_pyvmomi_lib_exists(mocker, fake_ansible_module):
+    """ Test if Pyvmomi is present or not"""
+    mocker.patch('ansible.module_utils.vmware.HAS_PYVMOMI', new=False)
+    with pytest.raises(FailJson) as exec_info:
+        PyVmomi(fake_ansible_module)
+
+    assert 'PyVmomi Python module required. Install using "pip install PyVmomi"' == exec_info.value.kwargs['msg']
+
+
+def test_requests_lib_exists(mocker, fake_ansible_module):
+    """ Test if requests is present or not"""
+    mocker.patch('ansible.module_utils.vmware.HAS_REQUESTS', new=False)
+    with pytest.raises(FailJson) as exec_info:
+        PyVmomi(fake_ansible_module)
+
+    msg = "Unable to find 'requests' Python library which is required. Please install using 'pip install requests'"
+    assert msg == exec_info.value.kwargs['msg']
+
+
+@pytest.mark.skipif(sys.version_info < (2, 7), reason="requires python2.7 and greater")
+@pytest.mark.parametrize("params, msg", test_data, ids=['hostname', 'username', 'password', 'validate_certs'])
+def test_required_params(request, params, msg, fake_ansible_module):
+    """ Test if required params are correct or not"""
+    fake_ansible_module.params = params
+    with pytest.raises(FailJson) as exec_info:
+        connect_to_api(fake_ansible_module)
+    assert msg in exec_info.value.kwargs['msg']
+
+
+def test_validate_certs(mocker, fake_ansible_module):
+    """ Test if SSL is required or not"""
+    fake_ansible_module.params = dict(
+        username='Administrator@vsphere.local',
+        password='Esxi@123$%',
+        hostname='esxi1',
+        validate_certs=True,
+    )
+
+    mocker.patch('ansible.module_utils.vmware.ssl', new=None)
+    with pytest.raises(FailJson) as exec_info:
+        PyVmomi(fake_ansible_module)
+    msg = 'pyVim does not support changing verification mode with python < 2.7.9.' \
+          ' Either update python or use validate_certs=false.'
+    assert msg == exec_info.value.kwargs['msg']