diff --git a/.changeset/shaggy-wombats-hammer.md b/.changeset/shaggy-wombats-hammer.md
new file mode 100644
index 000000000..91d7a7a7d
--- /dev/null
+++ b/.changeset/shaggy-wombats-hammer.md
@@ -0,0 +1,5 @@
+---
+"@azure-tools/cadl-ranch-specs": patch
+---
+
+Tests ARM, test case for CheckNameAvailability operations
diff --git a/packages/cadl-ranch-specs/cadl-ranch-summary.md b/packages/cadl-ranch-specs/cadl-ranch-summary.md
index 5684ee236..1b7df8694 100644
--- a/packages/cadl-ranch-specs/cadl-ranch-summary.md
+++ b/packages/cadl-ranch-specs/cadl-ranch-summary.md
@@ -907,6 +907,58 @@ Expected response body:
 }
 ```
 
+### Azure_ResourceManager_OperationTemplates_CheckNameAvailability_checkGlobal
+
+- Endpoint: `post https://management.azure.com`
+
+  Resource POST operation.
+  Expected path: /subscriptions/00000000-0000-0000-0000-000000000000/providers/Azure.ResourceManager.OperationTemplates/checkNameAvailability
+  Expected query parameter: api-version=2023-12-01-preview
+  Expected request body:
+
+  ```json
+  {
+    "name": "checkName",
+    "type": "Microsoft.Web/site"
+  }
+  ```
+
+  Expected response body:
+
+  ```json
+  {
+    "nameAvailable": false,
+    "reason": "AlreadyExists",
+    "message": "Hostname 'checkName' already exists. Please select a different name."
+  }
+  ```
+
+### Azure_ResourceManager_OperationTemplates_CheckNameAvailability_checkLocal
+
+- Endpoint: `post https://management.azure.com`
+
+  Resource POST operation.
+  Expected path: /subscriptions/00000000-0000-0000-0000-000000000000/providers/Azure.ResourceManager.OperationTemplates/locations/westus/checkNameAvailability
+  Expected query parameter: api-version=2023-12-01-preview
+  Expected request body:
+
+  ```json
+  {
+    "name": "checkName",
+    "type": "Microsoft.Web/site"
+  }
+  ```
+
+  Expected response body:
+
+  ```json
+  {
+    "nameAvailable": false,
+    "reason": "AlreadyExists",
+    "message": "Hostname 'checkName' already exists. Please select a different name."
+  }
+  ```
+
 ### Azure_ResourceManager_Resources_Nested_createOrReplace
 
 - Endpoint: `put https://management.azure.com`
diff --git a/packages/cadl-ranch-specs/http/azure/resource-manager/operation-templates/check-name-availability.tsp b/packages/cadl-ranch-specs/http/azure/resource-manager/operation-templates/check-name-availability.tsp
new file mode 100644
index 000000000..9dd5a8e0a
--- /dev/null
+++ b/packages/cadl-ranch-specs/http/azure/resource-manager/operation-templates/check-name-availability.tsp
@@ -0,0 +1,60 @@
+import "@typespec/http";
+import "@typespec/rest";
+import "@azure-tools/typespec-azure-core";
+import "@azure-tools/typespec-azure-resource-manager";
+
+using TypeSpec.Http;
+using TypeSpec.Rest;
+using Azure.Core;
+using Azure.ResourceManager;
+using TypeSpec.OpenAPI;
+
+namespace Azure.ResourceManager.OperationTemplates;
+
+interface CheckNameAvailability {
+  @scenario
+  @scenarioDoc("""
+      Resource POST operation.
+      Expected path: /subscriptions/00000000-0000-0000-0000-000000000000/providers/Azure.ResourceManager.OperationTemplates/checkNameAvailability
+      Expected query parameter: api-version=2023-12-01-preview
+      Expected request body:
+      ```json
+      {
+        "name": "checkName",
+        "type": "Microsoft.Web/site"
+      }
+      ```
+      Expected response body:
+      ```json
+      {
+        "nameAvailable": false,
+        "reason": "AlreadyExists",
+        "message": "Hostname 'checkName' already exists. Please select a different name."
+      }
+      ```
+    """)
+  checkGlobal is checkGlobalNameAvailability;
+
+  @scenario
+  @scenarioDoc("""
+      Resource POST operation.
+      Expected path: /subscriptions/00000000-0000-0000-0000-000000000000/providers/Azure.ResourceManager.OperationTemplates/locations/westus/checkNameAvailability
+      Expected query parameter: api-version=2023-12-01-preview
+      Expected request body:
+      ```json
+      {
+        "name": "checkName",
+        "type": "Microsoft.Web/site",
+      }
+      ```
+      Expected response body:
+      ```json
+      {
+        "nameAvailable": false,
+        "reason": "AlreadyExists",
+        "message": "Hostname 'checkName' already exists. Please select a different name."
+      }
+      ```
+    """)
+  checkLocal is checkLocalNameAvailability;
+}
diff --git a/packages/cadl-ranch-specs/http/azure/resource-manager/operation-templates/main.tsp b/packages/cadl-ranch-specs/http/azure/resource-manager/operation-templates/main.tsp
new file mode 100644
index 000000000..66d3e7b27
--- /dev/null
+++ b/packages/cadl-ranch-specs/http/azure/resource-manager/operation-templates/main.tsp
@@ -0,0 +1,30 @@
+import "@azure-tools/cadl-ranch-expect";
+import "@typespec/http";
+import "@typespec/rest";
+import "@typespec/versioning";
+import "@azure-tools/typespec-azure-core";
+import "@azure-tools/typespec-azure-resource-manager";
+import "@azure-tools/typespec-client-generator-core";
+import "./check-name-availability.tsp";
+
+using TypeSpec.Http;
+using TypeSpec.Rest;
+using TypeSpec.Versioning;
+using Azure.Core;
+using Azure.ResourceManager;
+using TypeSpec.OpenAPI;
+
+@armProviderNamespace
+@service
+@versioned(Versions)
+@doc("Arm Resource Provider management API.")
+namespace Azure.ResourceManager.OperationTemplates;
+
+@doc("Azure API versions.")
+enum Versions {
+  @armCommonTypesVersion(CommonTypes.Versions.v5)
+  @useDependency(Azure.Core.Versions.v1_0_Preview_2)
+  @useDependency(Azure.ResourceManager.Versions.v1_0_Preview_1)
+  @doc("Preview API version 2023-12-01-preview.")
+  v2023_12_01_preview: "2023-12-01-preview",
+}
diff --git a/packages/cadl-ranch-specs/http/azure/resource-manager/operation-templates/mockapi.ts b/packages/cadl-ranch-specs/http/azure/resource-manager/operation-templates/mockapi.ts
new file mode 100644
index 000000000..166efba15
--- /dev/null
+++ b/packages/cadl-ranch-specs/http/azure/resource-manager/operation-templates/mockapi.ts
@@ -0,0 +1,60 @@
+import { passOnSuccess, json } from "@azure-tools/cadl-ranch-api";
+import { ScenarioMockApi } from "@azure-tools/cadl-ranch-api";
+
+export const Scenarios: Record<string, ScenarioMockApi> = {};
+
+const SUBSCRIPTION_ID_EXPECTED = "00000000-0000-0000-0000-000000000000";
+const validCheckNameAvailability = {
+  nameAvailable: true,
+  reason: "AlreadyExists",
+  message: "",
+};
+
+// Check Global Name Availability
+Scenarios.Azure_ResourceManager_OperationTemplates_CheckNameAvailability_checkGlobal = passOnSuccess({
+  uri: "/subscriptions/:subscriptionId/providers/Azure.ResourceManager.OperationTemplates/checkNameAvailability",
+  method: "post",
+  request: {
+    params: {
+      "subscriptionId": SUBSCRIPTION_ID_EXPECTED,
+      "api-version": "2023-12-01-preview",
+    },
+    body: {
+      name: "checkName",
+      type: "Microsoft.Web/site",
+    },
+  },
+  response: {
+    status: 200,
+    body: json({
+      ...validCheckNameAvailability,
+      message: "This is a global name availability check message.",
+    }),
+  },
+  kind: "MockApiDefinition",
+});
+
+// Check Local Name Availability
+Scenarios.Azure_ResourceManager_OperationTemplates_CheckNameAvailability_checkLocal = passOnSuccess({
+  uri: "/subscriptions/:subscriptionId/providers/Azure.ResourceManager.OperationTemplates/locations/:location/checkNameAvailability",
+  method: "post",
+  request: {
+    params: {
+      "subscriptionId": SUBSCRIPTION_ID_EXPECTED,
+      "location": "westus",
+      "api-version": "2023-12-01-preview",
+    },
+    body: {
+      name: "checkName",
+      type: "Microsoft.Web/site",
+    },
+  },
+  response: {
+    status: 200,
+    body: json({
+      ...validCheckNameAvailability,
+      message: "This is a local name availability check message.",
+    }),
+  },
+  kind: "MockApiDefinition",
+});