initial code

.travis.yml

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+---
+language: python
+python:
+  - "2.7"
+
+# Install python packages for ansible and linters.
+install:
+  - "pip install -r requirements.txt"
+
+# Execute linting and unit tests before running the main playbook.
+before_script:
+  - "find . -name '*.yml' | xargs yamllint -s"
+
+# Perform playbook testing with mock CI inputs.
+script:
+  - "ansible-playbook test_playbook.yml -i hosts.yml"

hosts.yml

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+---
+all:
+  hosts:
+    CSR1:
+  vars:
+    ansible_network_os: "ios"
+    ansible_user: "ansible"
+    ansible_ssh_pass: "ansible"
+    ntp_server1: "192.0.2.1"
+    ntp_server2: "192.0.2.2"
+...

ntp_playbook.yml

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+---
+- name: "Manage NTP configuration"
+  hosts: all
+  connection: network_cli
+  gather_facts: false
+  tasks:
+    - name: "TASK 1: Validate NTP server IP addresses"
+      assert:
+        that:
+          - "ntp_server1 is defined"
+          - "ntp_server2 is defined"
+          - "ntp_server1 | ipv4 == ntp_server1"
+          - "ntp_server2 | ipv4 == ntp_server2"
+        msg: "Malformed input; please check ntp_server values"
+
+    - name: "TASK 2: Apply NTP updates"
+      ios_config:
+        commands:
+          - "ntp authenticate"
+          - "ntp logging"
+          - "ntp server {{ ntp_server1 }}"
+          - "ntp server {{ ntp_server2 }}"
+      register: "ntp_updates"
+
+    - name: "TASK 3: Print changes if NTP config changed"
+      debug:
+        var: ntp_updates.updates
+      when: "ntp_updates.updates is defined"
+...

requirements.txt

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+ansible==2.6.2
+yamllint

test_playbook.yml

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+---
+- name: "Import original playbook with modified inputs"
+  import_playbook: "ntp_playbook.yml"
+  vars:
+    ntp_server1: "203.0.113.1"
+    ntp_server2: "203.0.113.2"
+
+- name: "Log into routers to test playbook"
+  hosts: all
+  connection: network_cli
+  gather_facts: false
+  tasks:
+    - name: "TASK 1: Gather mock NTP data after enabling NTP"
+      ios_command:
+        commands: "show ntp associations"
+      register: ntp_associations
+
+    - name: "TASK 2: Check that mock NTP data is present"
+      assert:
+        that:
+          - "'203.0.113.1' in ntp_associations.stdout[0]"
+          - "'203.0.113.2' in ntp_associations.stdout[0]"
+        msg: "Missing some NTP data:\n{{ ntp_associations.stdout[0] }}"
+
+    - name: "TASK 2: Disable NTP"
+      ios_config:
+        commands: "no ntp"
+
+    - name: "TASK 3: Wait 2 seconds"
+      pause:
+        seconds: 2
+
+    - name: "TASK 4: Gather mock NTP data after disabling NTP"
+      ios_command:
+        commands: "show ntp associations"
+      register: ntp_associations
+
+    - name: "TASK 5: Check mock NTP data is absent"
+      assert:
+        that:
+          - "'203.0.113.1' not in ntp_associations.stdout[0]"
+          - "'203.0.113.2' not in ntp_associations.stdout[0]"
+        msg: "Saw some NTP data:\n{{ ntp_associations.stdout[0] }}"
+...