diff --git a/.github/workflows/ansible-test.yml b/.github/workflows/ansible-test.yml
index 10173ed89..529f5c5b8 100644
--- a/.github/workflows/ansible-test.yml
+++ b/.github/workflows/ansible-test.yml
@@ -41,3 +41,40 @@ jobs:
 
       - name: Run sanity tests
         run: ansible-test sanity --docker -v --color
+
+  unit:
+    name: Unit tests
+    strategy:
+      matrix:
+        ansible-version:
+          - stable-2.14
+        python-version:
+          - '3.9'
+    runs-on: ubuntu-latest
+    steps:
+
+      - name: Check out code
+        uses: actions/checkout@v1
+        with:
+          path: ansible_collections/dellemc/enterprise_sonic
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v1
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install ansible-base (${{ matrix.ansible-version }})
+        run: pip install https://github.com/ansible/ansible/archive/${{ matrix.ansible-version }}.tar.gz --disable-pip-version-check
+
+      - name: Install ansible and python prerequistes
+        run: |
+          ansible-galaxy collection install ansible.netcommon -p ../../
+          pip install coverage==6.5.0
+
+      - name: Run unit tests using ansible-test
+        run: ansible-test units -v --color --python ${{ matrix.python-version }} --coverage --docker
+
+      - name: Generate coverage report
+        run: |
+          ansible-test coverage combine --export tests/output/coverage/
+          ansible-test coverage report
diff --git a/tests/unit/compat/__init__.py b/tests/unit/compat/__init__.py
new file mode 100644
index 000000000..e69de29bb
diff --git a/tests/unit/compat/mock.py b/tests/unit/compat/mock.py
new file mode 100644
index 000000000..58dc78e07
--- /dev/null
+++ b/tests/unit/compat/mock.py
@@ -0,0 +1,23 @@
+"""
+Compatibility shim for mock imports in modules and module_utils.
+This can be removed once support for Python 2.7 is dropped.
+"""
+from __future__ import (absolute_import, division, print_function)
+__metaclass__ = type
+
+try:
+    from unittest.mock import (
+        call,
+        patch,
+        mock_open,
+        MagicMock,
+        Mock,
+    )
+except ImportError:
+    from mock import (
+        call,
+        patch,
+        mock_open,
+        MagicMock,
+        Mock,
+    )
diff --git a/tests/unit/compat/unittest.py b/tests/unit/compat/unittest.py
new file mode 100644
index 000000000..b41677417
--- /dev/null
+++ b/tests/unit/compat/unittest.py
@@ -0,0 +1,29 @@
+# (c) 2014, Toshio Kuratomi <tkuratomi@ansible.com>
+#
+# 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
+
+# Allow wildcard import because we really do want to import all of
+# unittests's symbols into this compat shim
+# pylint: disable=wildcard-import,unused-wildcard-import
+from unittest import *
+
+if not hasattr(TestCase, 'assertRaisesRegex'):
+    # added in Python 3.2
+    TestCase.assertRaisesRegex = TestCase.assertRaisesRegexp
diff --git a/tests/unit/modules/__init__.py b/tests/unit/modules/__init__.py
new file mode 100644
index 000000000..e69de29bb
diff --git a/tests/unit/modules/conftest.py b/tests/unit/modules/conftest.py
new file mode 100644
index 000000000..a7d1e0475
--- /dev/null
+++ b/tests/unit/modules/conftest.py
@@ -0,0 +1,31 @@
+# Copyright (c) 2017 Ansible Project
+# 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 json
+
+import pytest
+
+from ansible.module_utils.six import string_types
+from ansible.module_utils._text import to_bytes
+from ansible.module_utils.common._collections_compat import MutableMapping
+
+
+@pytest.fixture
+def patch_ansible_module(request, mocker):
+    if isinstance(request.param, string_types):
+        args = request.param
+    elif isinstance(request.param, MutableMapping):
+        if 'ANSIBLE_MODULE_ARGS' not in request.param:
+            request.param = {'ANSIBLE_MODULE_ARGS': request.param}
+        if '_ansible_remote_tmp' not in request.param['ANSIBLE_MODULE_ARGS']:
+            request.param['ANSIBLE_MODULE_ARGS']['_ansible_remote_tmp'] = '/tmp'
+        if '_ansible_keep_remote_files' not in request.param['ANSIBLE_MODULE_ARGS']:
+            request.param['ANSIBLE_MODULE_ARGS']['_ansible_keep_remote_files'] = False
+        args = json.dumps(request.param)
+    else:
+        raise Exception('Malformed data to the patch_ansible_module pytest fixture')
+
+    mocker.patch('ansible.module_utils.basic._ANSIBLE_ARGS', to_bytes(args))
diff --git a/tests/unit/modules/network/__init__.py b/tests/unit/modules/network/__init__.py
new file mode 100644
index 000000000..e69de29bb
diff --git a/tests/unit/modules/network/sonic/__init__.py b/tests/unit/modules/network/sonic/__init__.py
new file mode 100644
index 000000000..e69de29bb
diff --git a/tests/unit/modules/network/sonic/fixtures/sonic_dhcp_relay.yaml b/tests/unit/modules/network/sonic/fixtures/sonic_dhcp_relay.yaml
new file mode 100644
index 000000000..f683649cc
--- /dev/null
+++ b/tests/unit/modules/network/sonic/fixtures/sonic_dhcp_relay.yaml
@@ -0,0 +1,507 @@
+---
+merged_01:
+  module_args:
+    config:
+      - name: 'Eth1/5'
+        ipv4:
+          server_addresses:
+            - address: 100.1.1.2
+            - address: 100.1.1.3
+          source_interface: "Vlan 101"
+          vrf_name: "VrfReg1"
+          vrf_select: true
+          link_select: true
+          policy_action: "replace"
+          circuit_id: "%h:%p"
+        ipv6:
+          server_addresses:
+            - address: 100::2
+            - address: 100::3
+          source_interface: "Vlan 101"
+          vrf_name: "VrfReg2"
+          vrf_select: true
+      - name: 'Eth1/31'
+        ipv4:
+          max_hop_count: 8
+      - name: 'Eth1/32'
+        ipv6:
+          max_hop_count: 8
+  facts_get_requests:
+    - path: "data/openconfig-relay-agent:relay-agent/dhcp"
+      response:
+        code: 200
+        value:
+          openconfig-relay-agent:dhcp:
+            interfaces:
+              interface:
+                - id: 'Eth1/31'
+                  config:
+                    id: 'Eth1/31'
+                    helper-address:
+                      - '131.1.1.2'
+                    openconfig-relay-agent-ext:max-hop-count: 10
+                    openconfig-relay-agent-ext:policy-action: 'DISCARD'
+                  agent-information-option:
+                    config:
+                      circuit-id: '%p'
+                      openconfig-relay-agent-ext:vrf-select: 'DISABLE'
+                      openconfig-relay-agent-ext:link-select: 'DISABLE'
+    - path: "data/openconfig-relay-agent:relay-agent/dhcpv6"
+      response:
+        code: 200
+        value:
+          openconfig-relay-agent:dhcpv6:
+            interfaces:
+              interface:
+                - id: 'Eth1/32'
+                  config:
+                    id: 'Eth1/32'
+                    helper-address:
+                      - '131::2'
+                    openconfig-relay-agent-ext:max-hop-count: 10
+                  options:
+                    config:
+                      openconfig-relay-agent-ext:vrf-select: 'DISABLE'
+  config_requests:
+    - path: "data/openconfig-relay-agent:relay-agent/dhcp/interfaces/interface=Eth1%2f5/config/helper-address"
+      method: "patch"
+      data:
+        openconfig-relay-agent:helper-address:
+          - '100.1.1.2'
+          - '100.1.1.3'
+    - path: "data/openconfig-relay-agent:relay-agent/dhcp/interfaces/interface=Eth1%2f5/config/openconfig-relay-agent-ext:src-intf"
+      method: "patch"
+      data:
+        openconfig-relay-agent-ext:src-intf: "Vlan101"
+    - path: "data/openconfig-relay-agent:relay-agent/dhcp/interfaces/interface=Eth1%2f5/config/openconfig-relay-agent-ext:vrf"
+      method: "patch"
+      data:
+        openconfig-relay-agent-ext:vrf: "VrfReg1"
+    - path: "data/openconfig-relay-agent:relay-agent/dhcp/interfaces/interface=Eth1%2f5/agent-information-option/config/openconfig-relay-agent-ext:vrf-select"
+      method: "patch"
+      data:
+        openconfig-relay-agent-ext:vrf-select: "ENABLE"
+    - path: "data/openconfig-relay-agent:relay-agent/dhcp/interfaces/interface=Eth1%2f5/agent-information-option/config/openconfig-relay-agent-ext:link-select"
+      method: "patch"
+      data:
+        openconfig-relay-agent-ext:link-select: "ENABLE"
+    - path: "data/openconfig-relay-agent:relay-agent/dhcp/interfaces/interface=Eth1%2f5/config/openconfig-relay-agent-ext:policy-action"
+      method: "patch"
+      data:
+        openconfig-relay-agent-ext:policy-action: "REPLACE"
+    - path: "data/openconfig-relay-agent:relay-agent/dhcp/interfaces/interface=Eth1%2f5/agent-information-option/config/circuit-id"
+      method: "patch"
+      data:
+        openconfig-relay-agent:circuit-id: "%h:%p"
+    - path: "data/openconfig-relay-agent:relay-agent/dhcpv6/interfaces/interface=Eth1%2f5/config/helper-address"
+      method: "patch"
+      data:
+        openconfig-relay-agent:helper-address:
+          - '100::2'
+          - '100::3'
+    - path: "data/openconfig-relay-agent:relay-agent/dhcpv6/interfaces/interface=Eth1%2f5/config/openconfig-relay-agent-ext:src-intf"
+      method: "patch"
+      data:
+        openconfig-relay-agent-ext:src-intf: "Vlan101"
+    - path: "data/openconfig-relay-agent:relay-agent/dhcpv6/interfaces/interface=Eth1%2f5/config/openconfig-relay-agent-ext:vrf"
+      method: "patch"
+      data:
+        openconfig-relay-agent-ext:vrf: "VrfReg2"
+    - path: "data/openconfig-relay-agent:relay-agent/dhcpv6/interfaces/interface=Eth1%2f5/options/config/openconfig-relay-agent-ext:vrf-select"
+      method: "patch"
+      data:
+        openconfig-relay-agent-ext:vrf-select: "ENABLE"
+    - path: "data/openconfig-relay-agent:relay-agent/dhcp/interfaces/interface=Eth1%2f31/config/openconfig-relay-agent-ext:max-hop-count"
+      method: "patch"
+      data:
+        openconfig-relay-agent-ext:max-hop-count: 8
+    - path: "data/openconfig-relay-agent:relay-agent/dhcpv6/interfaces/interface=Eth1%2f32/config/openconfig-relay-agent-ext:max-hop-count"
+      method: "patch"
+      data:
+        openconfig-relay-agent-ext:max-hop-count: 8
+merged_02:
+  module_args:
+    config:
+      - name: 'Eth1/32'
+        ipv4:
+          server_addresses:
+            - address: '132.1.1.2'
+        ipv6:
+          server_addresses:
+            - address: '132::2'
+  facts_get_requests:
+    - path: "data/openconfig-relay-agent:relay-agent/dhcp"
+      response:
+        code: 200
+        value:
+          openconfig-relay-agent:dhcp:
+            interfaces:
+              interface:
+                - id: 'Eth1/32'
+                  config:
+                    id: 'Eth1/32'
+                    helper-address:
+                      - '132.1.1.2'
+                    openconfig-relay-agent-ext:max-hop-count: 10
+                    openconfig-relay-agent-ext:policy-action: 'DISCARD'
+                  agent-information-option:
+                    config:
+                      circuit-id: '%p'
+                      openconfig-relay-agent-ext:vrf-select: 'DISABLE'
+                      openconfig-relay-agent-ext:link-select: 'DISABLE'
+    - path: "data/openconfig-relay-agent:relay-agent/dhcpv6"
+      response:
+        code: 200
+        value:
+          openconfig-relay-agent:dhcpv6:
+            interfaces:
+              interface:
+                - id: 'Eth1/32'
+                  config:
+                    id: 'Eth1/32'
+                    helper-address:
+                      - '132::2'
+                    openconfig-relay-agent-ext:max-hop-count: 10
+                  options:
+                    config:
+                      openconfig-relay-agent-ext:vrf-select: 'DISABLE'
+  config_requests: []
+deleted_01:
+  module_args:
+    config:
+      - name: 'Eth1/1'
+        ipv4:
+          server_addresses:
+            - address: '100.1.1.2'
+          vrf_select: true
+          source_interface: 'Vlan100'
+          link_select: true
+          policy_action: 'replace'
+          circuit_id: '%i'
+      - name: 'Eth1/2'
+        ipv6:
+          server_addresses:
+            - address: '101::2'
+          vrf_select: true
+          source_interface: 'Vlan100'
+      - name: 'Eth1/3'
+        ipv4:
+          max_hop_count: 12
+        ipv6:
+          max_hop_count: 12
+    state: deleted
+  facts_get_requests:
+    - path: "data/openconfig-relay-agent:relay-agent/dhcp"
+      response:
+        code: 200
+        value:
+          openconfig-relay-agent:dhcp:
+            interfaces:
+              interface:
+                - id: 'Eth1/1'
+                  config:
+                    id: 'Eth1/1'
+                    helper-address:
+                      - '100.1.1.2'
+                      - '100.1.1.3'
+                    openconfig-relay-agent-ext:src-intf: 'Vlan100'
+                    openconfig-relay-agent-ext:vrf: 'VrfReg1'
+                    openconfig-relay-agent-ext:max-hop-count: 8
+                    openconfig-relay-agent-ext:policy-action: 'REPLACE'
+                  agent-information-option:
+                    config:
+                      circuit-id: '%i'
+                      openconfig-relay-agent-ext:vrf-select: 'ENABLE'
+                      openconfig-relay-agent-ext:link-select: 'ENABLE'
+                - id: 'Eth1/2'
+                  config:
+                    id: 'Eth1/2'
+                    helper-address:
+                      - '101.1.1.2'
+                      - '101.1.1.3'
+                    openconfig-relay-agent-ext:src-intf: 'Vlan100'
+                    openconfig-relay-agent-ext:vrf: 'VrfReg1'
+                    openconfig-relay-agent-ext:max-hop-count: 8
+                    openconfig-relay-agent-ext:policy-action: 'REPLACE'
+                  agent-information-option:
+                    config:
+                      circuit-id: '%i'
+                      openconfig-relay-agent-ext:vrf-select: 'ENABLE'
+                      openconfig-relay-agent-ext:link-select: 'ENABLE'
+                - id: 'Eth1/3'
+                  config:
+                    id: 'Eth1/3'
+                    helper-address:
+                      - '102.1.1.2'
+                      - '102.1.1.3'
+                    openconfig-relay-agent-ext:max-hop-count: 12
+                    openconfig-relay-agent-ext:policy-action: 'DISCARD'
+                  agent-information-option:
+                    config:
+                      circuit-id: '%p'
+                      openconfig-relay-agent-ext:vrf-select: 'DISABLE'
+                      openconfig-relay-agent-ext:link-select: 'DISABLE'
+    - path: "data/openconfig-relay-agent:relay-agent/dhcpv6"
+      response:
+        code: 200
+        value:
+          openconfig-relay-agent:dhcpv6:
+            interfaces:
+              interface:
+                - id: 'Eth1/1'
+                  config:
+                    id: 'Eth1/1'
+                    helper-address:
+                      - '100::2'
+                      - '100::3'
+                    openconfig-relay-agent-ext:src-intf: 'Vlan100'
+                    openconfig-relay-agent-ext:vrf: 'VrfReg1'
+                    openconfig-relay-agent-ext:max-hop-count: 8
+                  options:
+                    config:
+                      openconfig-relay-agent-ext:vrf-select: 'ENABLE'
+                - id: 'Eth1/2'
+                  config:
+                    id: 'Eth1/2'
+                    helper-address:
+                      - '101::2'
+                      - '101::3'
+                    openconfig-relay-agent-ext:src-intf: 'Vlan100'
+                    openconfig-relay-agent-ext:vrf: 'VrfReg1'
+                    openconfig-relay-agent-ext:max-hop-count: 8
+                  options:
+                    config:
+                      openconfig-relay-agent-ext:vrf-select: 'ENABLE'
+                - id: 'Eth1/3'
+                  config:
+                    id: 'Eth1/3'
+                    helper-address:
+                      - '101.1.1.2'
+                      - '101.1.1.3'
+                    openconfig-relay-agent-ext:max-hop-count: 12
+                  options:
+                    config:
+                      openconfig-relay-agent-ext:vrf-select: 'DISABLE'
+  config_requests:
+    - path: "data/openconfig-relay-agent:relay-agent/dhcp/interfaces/interface=Eth1%2f1/config/helper-address=100.1.1.2"
+      method: "delete"
+    - path: "data/openconfig-relay-agent:relay-agent/dhcp/interfaces/interface=Eth1%2f1/agent-information-option/config/openconfig-relay-agent-ext:vrf-select"
+      method: "delete"
+    - path: "data/openconfig-relay-agent:relay-agent/dhcp/interfaces/interface=Eth1%2f1/config/openconfig-relay-agent-ext:src-intf"
+      method: "delete"
+    - path: "data/openconfig-relay-agent:relay-agent/dhcp/interfaces/interface=Eth1%2f1/agent-information-option/config/openconfig-relay-agent-ext:link-select"
+      method: "delete"
+    - path: "data/openconfig-relay-agent:relay-agent/dhcp/interfaces/interface=Eth1%2f1/config/openconfig-relay-agent-ext:policy-action"
+      method: "delete"
+    - path: "data/openconfig-relay-agent:relay-agent/dhcp/interfaces/interface=Eth1%2f1/agent-information-option/config/circuit-id"
+      method: "delete"
+    - path: "data/openconfig-relay-agent:relay-agent/dhcpv6/interfaces/interface=Eth1%2f2/config/helper-address=101::2"
+      method: "delete"
+    - path: "data/openconfig-relay-agent:relay-agent/dhcpv6/interfaces/interface=Eth1%2f2/options/config/openconfig-relay-agent-ext:vrf-select"
+      method: "delete"
+    - path: "data/openconfig-relay-agent:relay-agent/dhcpv6/interfaces/interface=Eth1%2f2/config/openconfig-relay-agent-ext:src-intf"
+      method: "delete"
+    - path: "data/openconfig-relay-agent:relay-agent/dhcp/interfaces/interface=Eth1%2f3/config/openconfig-relay-agent-ext:max-hop-count"
+      method: "delete"
+    - path: "data/openconfig-relay-agent:relay-agent/dhcpv6/interfaces/interface=Eth1%2f3/config/openconfig-relay-agent-ext:max-hop-count"
+      method: "delete"
+deleted_02:
+  module_args:
+    config:
+      - name: 'Eth1/1'
+        ipv4:
+          server_addresses:
+            - address:
+        ipv6:
+          server_addresses:
+            - address:
+      - name: 'Eth1/2'
+        ipv4:
+          server_addresses:
+            - address: '101.1.1.2'
+            - address: '101.1.1.3'
+        ipv6:
+          server_addresses:
+            - address: '101::2'
+            - address: '101::3'
+      - name: 'Eth1/3'
+    state: deleted
+  facts_get_requests:
+    - path: "data/openconfig-relay-agent:relay-agent/dhcp"
+      response:
+        code: 200
+        value:
+          openconfig-relay-agent:dhcp:
+            interfaces:
+              interface:
+                - id: 'Eth1/1'
+                  config:
+                    id: 'Eth1/1'
+                    helper-address:
+                      - '100.1.1.2'
+                      - '100.1.1.3'
+                    openconfig-relay-agent-ext:src-intf: 'Vlan100'
+                    openconfig-relay-agent-ext:vrf: 'VrfReg1'
+                    openconfig-relay-agent-ext:max-hop-count: 8
+                    openconfig-relay-agent-ext:policy-action: 'REPLACE'
+                  agent-information-option:
+                    config:
+                      circuit-id: '%i'
+                      openconfig-relay-agent-ext:vrf-select: 'ENABLE'
+                      openconfig-relay-agent-ext:link-select: 'ENABLE'
+                - id: 'Eth1/2'
+                  config:
+                    id: 'Eth1/2'
+                    helper-address:
+                      - '101.1.1.2'
+                      - '101.1.1.3'
+                    openconfig-relay-agent-ext:src-intf: 'Vlan100'
+                    openconfig-relay-agent-ext:vrf: 'VrfReg1'
+                    openconfig-relay-agent-ext:max-hop-count: 8
+                    openconfig-relay-agent-ext:policy-action: 'REPLACE'
+                  agent-information-option:
+                    config:
+                      circuit-id: '%i'
+                      openconfig-relay-agent-ext:vrf-select: 'ENABLE'
+                      openconfig-relay-agent-ext:link-select: 'ENABLE'
+                - id: 'Eth1/3'
+                  config:
+                    id: 'Eth1/3'
+                    helper-address:
+                      - '102.1.1.2'
+                      - '102.1.1.3'
+                    openconfig-relay-agent-ext:max-hop-count: 10
+                    openconfig-relay-agent-ext:policy-action: 'DISCARD'
+                  agent-information-option:
+                    config:
+                      circuit-id: '%p'
+                      openconfig-relay-agent-ext:vrf-select: 'DISABLE'
+                      openconfig-relay-agent-ext:link-select: 'DISABLE'
+    - path: "data/openconfig-relay-agent:relay-agent/dhcpv6"
+      response:
+        code: 200
+        value:
+          openconfig-relay-agent:dhcpv6:
+            interfaces:
+              interface:
+                - id: 'Eth1/1'
+                  config:
+                    id: 'Eth1/1'
+                    helper-address:
+                      - '100::2'
+                      - '100::3'
+                    openconfig-relay-agent-ext:src-intf: 'Vlan100'
+                    openconfig-relay-agent-ext:vrf: 'VrfReg1'
+                    openconfig-relay-agent-ext:max-hop-count: 8
+                  options:
+                    config:
+                      openconfig-relay-agent-ext:vrf-select: 'ENABLE'
+                - id: 'Eth1/2'
+                  config:
+                    id: 'Eth1/2'
+                    helper-address:
+                      - '101::2'
+                      - '101::3'
+                    openconfig-relay-agent-ext:src-intf: 'Vlan100'
+                    openconfig-relay-agent-ext:vrf: 'VrfReg1'
+                    openconfig-relay-agent-ext:max-hop-count: 8
+                  options:
+                    config:
+                      openconfig-relay-agent-ext:vrf-select: 'ENABLE'
+                - id: 'Eth1/3'
+                  config:
+                    id: 'Eth1/3'
+                    helper-address:
+                      - '101.1.1.2'
+                      - '101.1.1.3'
+                    openconfig-relay-agent-ext:max-hop-count: 10
+                  options:
+                    config:
+                      openconfig-relay-agent-ext:vrf-select: 'DISABLE'
+  config_requests:
+    - path: "data/openconfig-relay-agent:relay-agent/dhcp/interfaces/interface=Eth1%2f1/config/helper-address"
+      method: "delete"
+    - path: "data/openconfig-relay-agent:relay-agent/dhcpv6/interfaces/interface=Eth1%2f1/config/helper-address"
+      method: "delete"
+    - path: "data/openconfig-relay-agent:relay-agent/dhcp/interfaces/interface=Eth1%2f2/config/helper-address"
+      method: "delete"
+    - path: "data/openconfig-relay-agent:relay-agent/dhcpv6/interfaces/interface=Eth1%2f2/config/helper-address"
+      method: "delete"
+    - path: "data/openconfig-relay-agent:relay-agent/dhcp/interfaces/interface=Eth1%2f3/config/helper-address"
+      method: "delete"
+    - path: "data/openconfig-relay-agent:relay-agent/dhcpv6/interfaces/interface=Eth1%2f3/config/helper-address"
+      method: "delete"
+deleted_03:
+  module_args:
+    config:
+    state: deleted
+  facts_get_requests:
+    - path: "data/openconfig-relay-agent:relay-agent/dhcp"
+      response:
+        code: 200
+        value:
+          openconfig-relay-agent:dhcp:
+            interfaces:
+              interface:
+                - id: 'Eth1/32'
+                  config:
+                    id: 'Eth1/32'
+                    helper-address:
+                      - '132.1.1.2'
+                      - '132.1.1.3'
+                    openconfig-relay-agent-ext:max-hop-count: 10
+                    openconfig-relay-agent-ext:policy-action: 'DISCARD'
+                  agent-information-option:
+                    config:
+                      circuit-id: '%p'
+                      openconfig-relay-agent-ext:vrf-select: 'DISABLE'
+                      openconfig-relay-agent-ext:link-select: 'DISABLE'
+    - path: "data/openconfig-relay-agent:relay-agent/dhcpv6"
+      response:
+        code: 200
+        value:
+          openconfig-relay-agent:dhcpv6:
+            interfaces:
+              interface:
+                - id: 'Eth1/32'
+                  config:
+                    id: 'Eth1/32'
+                    helper-address:
+                      - '132::2'
+                      - '132::3'
+                    openconfig-relay-agent-ext:max-hop-count: 10
+                  options:
+                    config:
+                      openconfig-relay-agent-ext:vrf-select: 'DISABLE'
+  config_requests:
+    - path: "data/openconfig-relay-agent:relay-agent/dhcp/interfaces/interface=Eth1%2f32/config/helper-address"
+      method: "delete"
+    - path: "data/openconfig-relay-agent:relay-agent/dhcpv6/interfaces/interface=Eth1%2f32/config/helper-address"
+      method: "delete"
+deleted_04:
+  module_args:
+    config:
+      - name: 'Eth1/1'
+        ipv4:
+          server_addresses:
+            - address: '100.1.1.2'
+          vrf_select: true
+          max_hop_count: 8
+          source_interface: 'Vlan100'
+          link_select: true
+          policy_action: 'replace'
+        ipv6:
+          server_addresses:
+            - address: '100::2'
+          source_interface: 'Vlan100'
+    state: deleted
+  facts_get_requests:
+    - path: "data/openconfig-relay-agent:relay-agent/dhcp"
+      response:
+        code: 200
+        value: {}
+    - path: "data/openconfig-relay-agent:relay-agent/dhcpv6"
+      response:
+        code: 200
+        value: {}
+  config_requests: []
diff --git a/tests/unit/modules/network/sonic/sonic_module.py b/tests/unit/modules/network/sonic/sonic_module.py
new file mode 100644
index 000000000..12faf76a2
--- /dev/null
+++ b/tests/unit/modules/network/sonic/sonic_module.py
@@ -0,0 +1,150 @@
+from __future__ import absolute_import, division, print_function
+__metaclass__ = type
+
+import os
+import yaml
+
+from ansible_collections.dellemc.enterprise_sonic.tests.unit.modules.utils import (
+    AnsibleExitJson,
+    AnsibleFailJson,
+    ModuleTestCase,
+)
+
+from ansible_collections.dellemc.enterprise_sonic.plugins.module_utils.network.sonic.sonic import (
+    update_url
+)
+from ansible_collections.dellemc.enterprise_sonic.plugins.module_utils.network.sonic.utils.utils import (
+    get_diff
+)
+
+
+class TestSonicModule(ModuleTestCase):
+    """Enterprise SONiC ansible module base unit test class"""
+
+    def setUp(self):
+        super(TestSonicModule, self).setUp()
+
+        self.config_requests_valid = []
+        self.config_requests_sent = []
+
+        self._config_requests_dict = {}
+        self._facts_requests_dict = {}
+
+    @staticmethod
+    def load_fixtures(file_name, content="yaml"):
+        """Load data from specified fixture file and format"""
+        fixture_path = os.path.join(os.path.dirname(__file__), "fixtures")
+        file_path = os.path.join(fixture_path, file_name)
+
+        file_stream = open(file_path, "r")
+        if content == "yaml":
+            data = yaml.full_load(file_stream)
+        else:
+            data = file_stream.read()
+        file_stream.close()
+
+        return data
+
+    def initialize_facts_get_requests(self, facts_get_requests):
+        for request in facts_get_requests:
+            self._facts_requests_dict[request['path']] = request['response']
+
+    def initialize_config_requests(self, config_requests):
+        for request in config_requests:
+            valid_request = request.copy()
+            path = valid_request['path']
+            method = valid_request['method'].lower()
+            data = valid_request.get('data', {})
+            if valid_request.get('response'):
+                response = valid_request.pop('response')
+            else:
+                response = {}
+
+            self.config_requests_valid.append(valid_request)
+            if self._config_requests_dict.get(path) is None:
+                self._config_requests_dict[path] = {}
+
+            config_request_dict = self._config_requests_dict[path]
+            if config_request_dict.get(method) is None:
+                config_request_dict[method] = []
+
+            config_request_dict[method].append([
+                data,
+                {'code': response.get('code', 200), 'value': response.get('value', {})}
+            ])
+
+    def facts_side_effect(self, module, commands):
+        """Side effect function for 'facts' GET requests mock"""
+        responses = []
+        for command in commands:
+            response = []
+            path = update_url(command['path'])
+            method = command['method'].lower()
+
+            if method == 'get':
+                if self._facts_requests_dict.get(path):
+                    response.append(self._facts_requests_dict[path]['code'])
+                    response.append(self._facts_requests_dict[path]['value'])
+            else:
+                self.module.fail_json(msg="Non GET REST API request made in get facts {0}".format(command))
+
+            responses.append(response)
+
+        return responses
+
+    def config_side_effect(self, module, commands):
+        """Side effect function for 'config' requests mock"""
+        responses = []
+        for command in commands:
+            response = []
+            path = update_url(command['path'])
+            method = command['method'].lower()
+            data = command['data']
+
+            self.config_requests_sent.append({'path': path, 'method': method, 'data': data})
+            entries = self._config_requests_dict.get(path, {}).get(method, [])
+            for entry in entries:
+                if data == entry[0]:
+                    response.append(entry[1]['code'])
+                    response.append(entry[1]['value'])
+                    break
+
+            responses.append(response)
+
+        return responses
+
+    def execute_module(self, failed=False, changed=False):
+        if failed:
+            result = self.failed()
+        else:
+            result = self.changed(changed)
+
+        return result
+
+    def failed(self):
+        with self.assertRaises(AnsibleFailJson) as exc:
+            self.module.main()
+
+        result = exc.exception.args[0]
+        self.assertTrue(result["failed"], result)
+        return result
+
+    def changed(self, changed=False):
+        with self.assertRaises(AnsibleExitJson) as exc:
+            self.module.main()
+
+        result = exc.exception.args[0]
+        self.assertEqual(result["changed"], changed, result)
+        return result
+
+    def validate_config_requests(self):
+        """Check if both list of requests sent and expected are same"""
+        # Sort by 'path' (primary) followed by 'method' (secondary)
+        self.config_requests_valid.sort(key=lambda request: request['method'])
+        self.config_requests_valid.sort(key=lambda request: request['path'])
+        self.config_requests_sent.sort(key=lambda request: request['method'])
+        self.config_requests_sent.sort(key=lambda request: request['path'])
+
+        self.assertEqual(len(self.config_requests_valid), len(self.config_requests_sent))
+        for valid_request, sent_request in zip(self.config_requests_valid, self.config_requests_sent):
+            self.assertEqual(get_diff(valid_request, sent_request, [{'path': "", 'method': "", 'data': {}}]), {})
diff --git a/tests/unit/modules/network/sonic/test_sonic_dhcp_relay.py b/tests/unit/modules/network/sonic/test_sonic_dhcp_relay.py
new file mode 100644
index 000000000..433d4f5c2
--- /dev/null
+++ b/tests/unit/modules/network/sonic/test_sonic_dhcp_relay.py
@@ -0,0 +1,96 @@
+from __future__ import absolute_import, division, print_function
+
+__metaclass__ = type
+
+from ansible_collections.dellemc.enterprise_sonic.tests.unit.compat.mock import (
+    patch,
+)
+from ansible_collections.dellemc.enterprise_sonic.plugins.modules import (
+    sonic_dhcp_relay,
+)
+from ansible_collections.dellemc.enterprise_sonic.tests.unit.modules.utils import (
+    set_module_args,
+)
+from .sonic_module import TestSonicModule
+
+
+class TestSonicDhcpRelayModule(TestSonicModule):
+    module = sonic_dhcp_relay
+
+    @classmethod
+    def setUpClass(cls):
+        cls.mock_facts_edit_config = patch(
+            "ansible_collections.dellemc.enterprise_sonic.plugins.module_utils.network.sonic.facts.dhcp_relay.dhcp_relay.edit_config"
+        )
+        cls.mock_config_edit_config = patch(
+            "ansible_collections.dellemc.enterprise_sonic.plugins.module_utils.network.sonic.config.dhcp_relay.dhcp_relay.edit_config"
+        )
+        cls.mock_get_interface_naming_mode = patch(
+            "ansible_collections.dellemc.enterprise_sonic.plugins.module_utils.network.sonic.utils.utils.get_device_interface_naming_mode"
+        )
+        cls.fixture_data = cls.load_fixtures('sonic_dhcp_relay.yaml')
+
+    def setUp(self):
+        super(TestSonicDhcpRelayModule, self).setUp()
+        self.facts_edit_config = self.mock_facts_edit_config.start()
+        self.config_edit_config = self.mock_config_edit_config.start()
+
+        self.facts_edit_config.side_effect = self.facts_side_effect
+        self.config_edit_config.side_effect = self.config_side_effect
+
+        self.get_interface_naming_mode = self.mock_get_interface_naming_mode.start()
+        self.get_interface_naming_mode.return_value = 'standard'
+
+    def tearDown(self):
+        super(TestSonicDhcpRelayModule, self).tearDown()
+        self.mock_facts_edit_config.stop()
+        self.mock_config_edit_config.stop()
+        self.mock_get_interface_naming_mode.stop()
+
+    def test_sonic_dhcp_relay_merged_01(self):
+        set_module_args(self.fixture_data['merged_01']['module_args'])
+        self.initialize_facts_get_requests(self.fixture_data['merged_01']['facts_get_requests'])
+        self.initialize_config_requests(self.fixture_data['merged_01']['config_requests'])
+
+        result = self.execute_module(changed=True)
+        self.validate_config_requests()
+
+    def test_sonic_dhcp_relay_merged_02(self):
+        set_module_args(self.fixture_data['merged_02']['module_args'])
+        self.initialize_facts_get_requests(self.fixture_data['merged_02']['facts_get_requests'])
+        self.initialize_config_requests(self.fixture_data['merged_02']['config_requests'])
+
+        result = self.execute_module(changed=False)
+        self.validate_config_requests()
+
+    def test_sonic_dhcp_relay_deleted_01(self):
+        set_module_args(self.fixture_data['deleted_01']['module_args'])
+        self.initialize_facts_get_requests(self.fixture_data['deleted_01']['facts_get_requests'])
+        self.initialize_config_requests(self.fixture_data['deleted_01']['config_requests'])
+
+        result = self.execute_module(changed=True)
+        self.validate_config_requests()
+
+    def test_sonic_dhcp_relay_deleted_02(self):
+        set_module_args(self.fixture_data['deleted_02']['module_args'])
+        self.initialize_facts_get_requests(self.fixture_data['deleted_02']['facts_get_requests'])
+        self.initialize_config_requests(self.fixture_data['deleted_02']['config_requests'])
+
+        result = self.execute_module(changed=True)
+        self.validate_config_requests()
+
+    def test_sonic_dhcp_relay_deleted_03(self):
+        set_module_args(self.fixture_data['deleted_03']['module_args'])
+        self.initialize_facts_get_requests(self.fixture_data['deleted_03']['facts_get_requests'])
+        self.initialize_config_requests(self.fixture_data['deleted_03']['config_requests'])
+
+        result = self.execute_module(changed=True)
+        self.validate_config_requests()
+
+    def test_sonic_dhcp_relay_deleted_04(self):
+        set_module_args(self.fixture_data['deleted_04']['module_args'])
+        self.initialize_facts_get_requests(self.fixture_data['deleted_04']['facts_get_requests'])
+        self.initialize_config_requests(self.fixture_data['deleted_04']['config_requests'])
+
+        result = self.execute_module(changed=False)
+        self.validate_config_requests()
diff --git a/tests/unit/modules/utils.py b/tests/unit/modules/utils.py
new file mode 100644
index 000000000..0157649ce
--- /dev/null
+++ b/tests/unit/modules/utils.py
@@ -0,0 +1,51 @@
+from __future__ import (absolute_import, division, print_function)
+__metaclass__ = type
+
+import json
+
+from ansible.module_utils import basic
+from ansible.module_utils._text import to_bytes
+
+from ansible_collections.dellemc.enterprise_sonic.tests.unit.compat import unittest
+from ansible_collections.dellemc.enterprise_sonic.tests.unit.compat.mock import patch
+
+
+def set_module_args(args):
+    if '_ansible_remote_tmp' not in args:
+        args['_ansible_remote_tmp'] = '/tmp'
+    if '_ansible_keep_remote_files' not in args:
+        args['_ansible_keep_remote_files'] = False
+
+    args = json.dumps({'ANSIBLE_MODULE_ARGS': args})
+    basic._ANSIBLE_ARGS = to_bytes(args)
+
+
+class AnsibleExitJson(Exception):
+    pass
+
+
+class AnsibleFailJson(Exception):
+    pass
+
+
+def exit_json(*args, **kwargs):
+    if 'changed' not in kwargs:
+        kwargs['changed'] = False
+    raise AnsibleExitJson(kwargs)
+
+
+def fail_json(*args, **kwargs):
+    kwargs['failed'] = True
+    raise AnsibleFailJson(kwargs)
+
+
+class ModuleTestCase(unittest.TestCase):
+
+    def setUp(self):
+        self.mock_module = patch.multiple(basic.AnsibleModule, exit_json=exit_json, fail_json=fail_json)
+        self.mock_module.start()
+        self.mock_sleep = patch('time.sleep')
+        self.mock_sleep.start()
+        set_module_args({})
+        self.addCleanup(self.mock_module.stop)
+        self.addCleanup(self.mock_sleep.stop)