diff --git a/.changeset/funny-toes-hunt.md b/.changeset/funny-toes-hunt.md
new file mode 100644
index 000000000..4227bf1ea
--- /dev/null
+++ b/.changeset/funny-toes-hunt.md
@@ -0,0 +1,5 @@
+---
+"@azure-tools/cadl-ranch-specs": patch
+---
+
+Added tests for ARM, test case for resource action.
diff --git a/packages/cadl-ranch-specs/cadl-ranch-summary.md b/packages/cadl-ranch-specs/cadl-ranch-summary.md
index 0c0bc93bf..e9aa6ca39 100644
--- a/packages/cadl-ranch-specs/cadl-ranch-summary.md
+++ b/packages/cadl-ranch-specs/cadl-ranch-summary.md
@@ -964,6 +964,22 @@ Expected response body:
 }
 ```
 
+### Azure_ResourceManager_Models_Resources_TopLevelTrackedResources_actionSync
+
+- Endpoint: `post https://management.azure.com`
+
+  Resource sync action.
+  Expected path: /subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/test-rg/providers/Azure.ResourceManager.Models.Resources/topLevelTrackedResources/top/actionSync
+  Expected query parameter: api-version=2023-12-01-preview
+  Expected request body:
+
+  ```json
+  {
+    "message": "Resource action at top level.",
+    "urgent": true
+  }
+  ```
+
 ### Azure_ResourceManager_Models_Resources_TopLevelTrackedResources_createOrReplace
 
 - Endpoint: `put https://management.azure.com`
diff --git a/packages/cadl-ranch-specs/http/azure/resource-manager/models/resources/mockapi.ts b/packages/cadl-ranch-specs/http/azure/resource-manager/models/resources/mockapi.ts
index ac99dd930..25d2d6fb6 100644
--- a/packages/cadl-ranch-specs/http/azure/resource-manager/models/resources/mockapi.ts
+++ b/packages/cadl-ranch-specs/http/azure/resource-manager/models/resources/mockapi.ts
@@ -42,6 +42,31 @@ const validNestedResource = {
   },
 };
 
+Scenarios.Azure_ResourceManager_Models_Resources_TopLevelTrackedResources_actionSync = passOnSuccess([
+  mockapi.post(
+    "/subscriptions/:subscriptionId/resourceGroups/:resourceGroup/providers/Azure.ResourceManager.Models.Resources/topLevelTrackedResources/:topLevelResourceName/actionSync",
+    (req) => {
+      req.expect.containsQueryParam("api-version", "2023-12-01-preview");
+      if (req.params.subscriptionId !== SUBSCRIPTION_ID_EXPECTED) {
+        throw new ValidationError("Unexpected subscriptionId", SUBSCRIPTION_ID_EXPECTED, req.params.subscriptionId);
+      }
+      if (req.params.resourceGroup.toLowerCase() !== RESOURCE_GROUP_EXPECTED) {
+        throw new ValidationError("Unexpected resourceGroup", RESOURCE_GROUP_EXPECTED, req.params.resourceGroup);
+      }
+      if (req.params.topLevelResourceName.toLowerCase() !== "top") {
+        throw new ValidationError("Unexpected top level resource name", "top", req.params.topLevelResourceName);
+      }
+      req.expect.bodyEquals({
+        message: "Resource action at top level.",
+        urgent: true,
+      });
+      return {
+        status: 204,
+      };
+    },
+  ),
+]);
+
 // top level tracked resource
 Scenarios.Azure_ResourceManager_Models_Resources_TopLevelTrackedResources_get = passOnSuccess([
   mockapi.get(
diff --git a/packages/cadl-ranch-specs/http/azure/resource-manager/models/resources/toplevel.tsp b/packages/cadl-ranch-specs/http/azure/resource-manager/models/resources/toplevel.tsp
index 821de27d6..471b04ecf 100644
--- a/packages/cadl-ranch-specs/http/azure/resource-manager/models/resources/toplevel.tsp
+++ b/packages/cadl-ranch-specs/http/azure/resource-manager/models/resources/toplevel.tsp
@@ -31,6 +31,15 @@ model TopLevelTrackedResourceProperties {
   description?: string;
 }
 
+@doc("The details of a user notification.")
+model NotificationDetails {
+  @doc("The notification message.")
+  message: string;
+
+  @doc("If true, the notification is urgent.")
+  urgent: boolean;
+}
+
 @armResourceOperations
 interface TopLevelTrackedResources {
   @scenario
@@ -211,4 +220,19 @@ interface TopLevelTrackedResources {
     ```
     """)
   listBySubscription is ArmListBySubscription<TopLevelTrackedResource>;
+
+  @scenario
+  @scenarioDoc("""
+      Resource sync action.
+      Expected path: /subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/test-rg/providers/Azure.ResourceManager.Models.Resources/topLevelTrackedResources/top/actionSync
+      Expected query parameter: api-version=2023-12-01-preview
+      Expected request body:
+      ```json
+      {
+        "message": "Resource action at top level.",
+        "urgent": true
+      }
+      ```
+    """)
+  actionSync is ArmResourceActionNoContentSync<TopLevelTrackedResource, NotificationDetails>;
 }