Run save inside config mode.

lib/ansible/modules/network/vyos/vyos_config.py

@@ -269,9 +269,11 @@ def main():
         run(module, result)
 
     if module.params['save']:
-        if not module.check_mode:
-            run_commands(module, ['save'])
-        result['changed'] = True
+        diff = run_commands(module, commands=['configure', 'compare saved'])[1]
+        if diff != '[edit]':
+            run_commands(module, commands=['save'])
+            result['changed'] = True
+        run_commands(module, commands=['exit'])
 
     module.exit_json(**result)
 

test/integration/targets/vyos_config/tests/cli/save.yaml

@@ -0,0 +1,60 @@
+---
+- debug: msg="START cli/save.yaml"
+
+- name: setup
+  vyos_config:
+    lines: set system host-name {{ inventory_hostname_short }}
+    provider: "{{ cli }}"
+    match: none
+
+- name: configure hostaname and save
+  vyos_config:
+    lines: set system host-name foo
+    provider: "{{ cli }}"
+    save: true
+  register: result
+
+- assert:
+    that:
+      - "result.changed == true"
+      - "'set system host-name foo' in result.commands"
+
+- name: configure hostaname and don't save
+  vyos_config:
+    lines: set system host-name bar
+    provider: "{{ cli }}"
+  register: result
+
+- assert:
+    that:
+      - "result.changed == true"
+      - "'set system host-name bar' in result.commands"
+
+- name: save config
+  vyos_config:
+    save: true
+    provider: "{{ cli }}"
+  register: result
+
+- assert:
+    that:
+      - "result.changed == true"
+
+- name: save config again
+  vyos_config:
+    save: true
+    provider: "{{ cli }}"
+  register: result
+
+- assert:
+    that:
+      - "result.changed == false"
+
+- name: teardown
+  vyos_config:
+    lines: set system host-name {{ inventory_hostname_short }}
+    provider: "{{ cli }}"
+    match: none
+    save: true
+
+- debug: msg="END cli/simple.yaml"

test/units/modules/network/vyos/test_vyos_config.py

@@ -73,15 +73,6 @@ def test_vyos_config_backup(self):
         result = self.execute_module()
         self.assertIn('__backup__', result)
 
-    def test_vyos_config_save(self):
-        set_module_args(dict(save=True))
-        self.execute_module(changed=True)
-        self.assertEqual(self.run_commands.call_count, 1)
-        self.assertEqual(self.get_config.call_count, 0)
-        self.assertEqual(self.load_config.call_count, 0)
-        args = self.run_commands.call_args[0][1]
-        self.assertIn('save', args)
-
     def test_vyos_config_lines(self):
         commands = ['set system host-name foo']
         set_module_args(dict(lines=commands))