Fixed win_route module (#46395)

* Changed $IpAddress to $Gateway

* Tweaked win_route unit tests

Checks to see if new static route has the correct gateway

* Create win_route.yaml

* Fixed incorrect variable name

changelogs/fragments/win_route.yaml

@@ -0,0 +1,2 @@
+bugfixes:
+- win_route - Corrected issue where the wrong network interface was used for new static routes. - https://github.com/ansible/ansible/issues/28051

lib/ansible/modules/windows/win_route.ps1

@@ -39,7 +39,7 @@ Function Add-Route {
   if (!($Route)){
     try {
       # Find Interface Index
-      $InterfaceIndex = Find-NetRoute -RemoteIPAddress $IpAddress | Select -First 1 -ExpandProperty InterfaceIndex
+      $InterfaceIndex = Find-NetRoute -RemoteIPAddress $Gateway | Select -First 1 -ExpandProperty InterfaceIndex
 
       # Add network route
       New-NetRoute -DestinationPrefix $Destination -NextHop $Gateway -InterfaceIndex $InterfaceIndex -RouteMetric $Metric -ErrorAction Stop -WhatIf:$CheckMode|out-null 

test/integration/targets/win_route/tasks/tests.yml

@@ -7,15 +7,20 @@
     state: present
   register: route
 
-- name: check if route successfully addedd
+- name: check if route successfully added
   win_shell: (Get-CimInstance win32_ip4PersistedrouteTable -Filter "Destination = '{{ destination_ip_address }}'").Caption
   register: route_added
 
-- name: test if route successfully addedd
+- name: check route default gateway
+  win_shell: (Get-CimInstance win32_ip4PersistedrouteTable -Filter "Destination = '{{ destination_ip_address }}'").NextHop
+  register: route_gateway
+
+- name: test if route successfully added
   assert:
     that:
       - route is changed
       - route_added.stdout_lines[0] == "{{ destination_ip_address }}"
+      - route_gateway.stdout_lines[0] == "{{ default_gateway }}"
 
 - name: add a static route to test idempotency
   win_route: