Add multi-service tests for older API versions and shared models

.chronus/changes/add-multi-service-tests-2026-01-05-08-56-40.md

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+---
+changeKind: feature
+packages:
+  - "@azure-tools/azure-http-specs"
+---
+
+Add multi-service test scenarios for older API versions and shared models.

packages/azure-http-specs/specs/azure/resource-manager/multi-service-older-versions/client.tsp

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+import "./service1.tsp";
+import "./service2.tsp";
+import "@azure-tools/typespec-client-generator-core";
+
+using Versioning;
+using Azure.Core;
+using Azure.ResourceManager;
+using Azure.ClientGenerator.Core;
+
+@client({
+  service: [
+    Azure.ResourceManager.MultiServiceOlderVersions.Compute,
+    Azure.ResourceManager.MultiServiceOlderVersions.ComputeDisk
+  ],
+})
+@useDependency(
+  Azure.ResourceManager.MultiServiceOlderVersions.Compute.Versions.v2024_11_01,
+  Azure.ResourceManager.MultiServiceOlderVersions.ComputeDisk.Versions.v2024_03_02
+)
+namespace Azure.ResourceManager.MultiServiceOlderVersions.Combined;

packages/azure-http-specs/specs/azure/resource-manager/multi-service-older-versions/mockapi.ts

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+import { json, passOnSuccess, ScenarioMockApi } from "@typespec/spec-api";
+
+export const Scenarios: Record<string, ScenarioMockApi> = {};
+
+// Mock data for Compute (VirtualMachine)
+const SUBSCRIPTION_ID = "00000000-0000-0000-0000-000000000000";
+const RESOURCE_GROUP = "test-rg";
+const LOCATION = "eastus";
+
+const virtualMachine = {
+  id: `/subscriptions/${SUBSCRIPTION_ID}/resourceGroups/${RESOURCE_GROUP}/providers/Microsoft.Compute/virtualMachinesOld/vm-old1`,
+  name: "vm-old1",
+  type: "Microsoft.Compute/virtualMachinesOld",
+  location: LOCATION,
+  properties: {
+    provisioningState: "Succeeded",
+    size: "Standard_D2s_v3",
+  },
+};
+
+// Mock data for ComputeDisk (Disk)
+const disk = {
+  id: `/subscriptions/${SUBSCRIPTION_ID}/resourceGroups/${RESOURCE_GROUP}/providers/Microsoft.Compute/disksOld/disk-old1`,
+  name: "disk-old1",
+  type: "Microsoft.Compute/disksOld",
+  location: LOCATION,
+  properties: {
+    provisioningState: "Succeeded",
+    diskSizeGB: 128,
+  },
+};
+
+// Scenario: Get Virtual Machine
+Scenarios.Azure_ResourceManager_MultiServiceOlderVersions_Compute_VirtualMachines_get =
+  passOnSuccess([
+    {
+      uri: `/subscriptions/${SUBSCRIPTION_ID}/resourceGroups/${RESOURCE_GROUP}/providers/Microsoft.Compute/virtualMachinesOld/vm-old1`,
+      method: "get",
+      request: {
+        query: {
+          "api-version": "2024-11-01",
+        },
+      },
+      response: {
+        status: 200,
+        body: json(virtualMachine),
+      },
+      kind: "MockApiDefinition",
+    },
+  ]);
+
+// Scenario: Create or Update Virtual Machine
+Scenarios.Azure_ResourceManager_MultiServiceOlderVersions_Compute_VirtualMachines_createOrUpdate =
+  passOnSuccess([
+    {
+      uri: `/subscriptions/${SUBSCRIPTION_ID}/resourceGroups/${RESOURCE_GROUP}/providers/Microsoft.Compute/virtualMachinesOld/vm-old1`,
+      method: "put",
+      request: {
+        query: {
+          "api-version": "2024-11-01",
+        },
+        body: json({
+          location: LOCATION,
+          properties: {
+            size: "Standard_D2s_v3",
+          },
+        }),
+      },
+      response: {
+        status: 200,
+        body: json(virtualMachine),
+      },
+      kind: "MockApiDefinition",
+    },
+  ]);
+
+// Scenario: Get Disk
+Scenarios.Azure_ResourceManager_MultiServiceOlderVersions_ComputeDisk_Disks_get = passOnSuccess([
+  {
+    uri: `/subscriptions/${SUBSCRIPTION_ID}/resourceGroups/${RESOURCE_GROUP}/providers/Microsoft.Compute/disksOld/disk-old1`,
+    method: "get",
+    request: {
+      query: {
+        "api-version": "2024-03-02",
+      },
+    },
+    response: {
+      status: 200,
+      body: json(disk),
+    },
+    kind: "MockApiDefinition",
+  },
+]);
+
+// Scenario: Create or Update Disk
+Scenarios.Azure_ResourceManager_MultiServiceOlderVersions_ComputeDisk_Disks_createOrUpdate =
+  passOnSuccess([
+    {
+      uri: `/subscriptions/${SUBSCRIPTION_ID}/resourceGroups/${RESOURCE_GROUP}/providers/Microsoft.Compute/disksOld/disk-old1`,
+      method: "put",
+      request: {
+        query: {
+          "api-version": "2024-03-02",
+        },
+        body: json({
+          location: LOCATION,
+          properties: {
+            diskSizeGB: 128,
+          },
+        }),
+      },
+      response: {
+        status: 200,
+        body: json(disk),
+      },
+      kind: "MockApiDefinition",
+    },
+  ]);

packages/azure-http-specs/specs/azure/resource-manager/multi-service-older-versions/service1.tsp

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+import "@typespec/versioning";
+import "@azure-tools/typespec-azure-resource-manager";
+import "@typespec/spector";
+
+using TypeSpec.Versioning;
+using Spector;
+
+/**
+ * Compute Client
+ */
+@armProviderNamespace("Microsoft.Compute")
+@service(#{ title: "Azure Compute resource management API." })
+@versioned(Versions)
+namespace Azure.ResourceManager.MultiServiceOlderVersions.Compute;
+
+/**
+ * The available API versions.
+ */
+enum Versions {
+  /**
+   * The 2024-11-01 API version.
+   */
+  @armCommonTypesVersion(Azure.ResourceManager.CommonTypes.Versions.v3)
+  v2024_11_01: "2024-11-01",
+
+  /**
+   * The 2025-04-01 API version.
+   */
+  @armCommonTypesVersion(Azure.ResourceManager.CommonTypes.Versions.v3)
+  v2025_04_01: "2025-04-01",
+}
+
+/**
+ * Describes a Virtual Machine.
+ */
+model VirtualMachine is Azure.ResourceManager.TrackedResource<VirtualMachineProperties> {
+  ...ResourceNameParameter<
+    Resource = VirtualMachine,
+    KeyName = "vmName",
+    SegmentName = "virtualMachinesOld",
+    NamePattern = ""
+  >;
+}
+
+model VirtualMachineProperties {
+  @visibility(Lifecycle.Read)
+  provisioningState?: ResourceProvisioningState;
+
+  /**
+   * Size of the virtual machine. Only available in version 2024-11-01.
+   */
+  @added(Versions.v2024_11_01)
+  @removed(Versions.v2025_04_01)
+  size?: string;
+}
+
+@armResourceOperations
+interface VirtualMachines {
+  /**
+   * Retrieves information about the model view or the instance view of a virtual machine.
+   */
+  @scenario
+  @scenarioDoc("""
+    Test that a client can expose operations from multiple services using older API versions. This operation should be called like this: `client.virtualMachines.get(...)`.
+
+    GET a Virtual Machine.
+    Expected path: /subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/test-rg/providers/Microsoft.Compute/virtualMachinesOld/vm-old1
+    Expected query parameter: api-version=2024-11-01
+
+    Expected response body:
+    ```json
+    {
+      "id": "/subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/test-rg/providers/Microsoft.Compute/virtualMachinesOld/vm-old1",
+      "name": "vm-old1",
+      "type": "Microsoft.Compute/virtualMachinesOld",
+      "location": "eastus",
+      "properties": {
+        "provisioningState": "Succeeded",
+        "size": "Standard_D2s_v3"
+      }
+    }
+    ```
+    """)
+  get is ArmResourceRead<VirtualMachine>;
+
+  /**
+   * The operation to create or update a virtual machine. Please note some properties can be set only during virtual machine creation.
+   */
+  @scenario
+  @scenarioDoc("""
+    Test that a client can expose operations from multiple services using older API versions. This operation should be called like this: `client.virtualMachines.createOrUpdate(...)`.
+
+    PUT (create or update) a Virtual Machine.
+    Expected path: /subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/test-rg/providers/Microsoft.Compute/virtualMachinesOld/vm-old1
+    Expected query parameter: api-version=2024-11-01
+    Expected request body:
+    ```json
+    {
+      "location": "eastus",
+      "properties": {
+        "size": "Standard_D2s_v3"
+      }
+    }
+    ```
+    Expected response body:
+    ```json
+    {
+      "id": "/subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/test-rg/providers/Microsoft.Compute/virtualMachinesOld/vm-old1",
+      "name": "vm-old1",
+      "type": "Microsoft.Compute/virtualMachinesOld",
+      "location": "eastus",
+      "properties": {
+        "provisioningState": "Succeeded",
+        "size": "Standard_D2s_v3"
+      }
+    }
+    ```
+    """)
+  createOrUpdate is ArmResourceCreateOrUpdateAsync<VirtualMachine>;
+}

packages/azure-http-specs/specs/azure/resource-manager/multi-service-older-versions/service2.tsp

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+import "@typespec/versioning";
+import "@azure-tools/typespec-azure-resource-manager";
+import "@typespec/spector";
+
+using TypeSpec.Versioning;
+using Spector;
+
+/**
+ * Compute Disk Client
+ */
+@armProviderNamespace("Microsoft.Compute")
+@service(#{ title: "Azure Compute Disk resource management API." })
+@versioned(Versions)
+namespace Azure.ResourceManager.MultiServiceOlderVersions.ComputeDisk;
+
+/**
+ * The available API versions.
+ */
+enum Versions {
+  /**
+   * The 2024-03-02 API version.
+   */
+  @armCommonTypesVersion(Azure.ResourceManager.CommonTypes.Versions.v3)
+  v2024_03_02: "2024-03-02",
+
+  /**
+   * The 2025-01-02 API version.
+   */
+  @armCommonTypesVersion(Azure.ResourceManager.CommonTypes.Versions.v3)
+  v2025_01_02: "2025-01-02",
+}
+
+/**
+ * Disk resource.
+ */
+model Disk is Azure.ResourceManager.TrackedResource<DiskProperties> {
+  ...ResourceNameParameter<
+    Resource = Disk,
+    KeyName = "diskName",
+    SegmentName = "disksOld",
+    NamePattern = ""
+  >;
+}
+
+/**
+ * Disk resource properties.
+ */
+model DiskProperties {
+  @visibility(Lifecycle.Read)
+  provisioningState?: ResourceProvisioningState;
+
+  /**
+   * Size of the disk in GB. Only available in version 2024-03-02.
+   */
+  @added(Versions.v2024_03_02)
+  @removed(Versions.v2025_01_02)
+  diskSizeGB?: int32;
+}
+
+@armResourceOperations
+interface Disks {
+  /**
+   * Gets information about a disk.
+   */
+  @scenario
+  @scenarioDoc("""
+    Test that a client can expose operations from multiple services using older API versions. This operation should be called like this: `client.disks.get(...)`.
+
+    GET a Disk resource.
+    Expected path: /subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/test-rg/providers/Microsoft.Compute/disksOld/disk-old1
+    Expected query parameter: api-version=2024-03-02
+
+    Expected response body:
+    ```json
+    {
+      "id": "/subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/test-rg/providers/Microsoft.Compute/disksOld/disk-old1",
+      "name": "disk-old1",
+      "type": "Microsoft.Compute/disksOld",
+      "location": "eastus",
+      "properties": {
+        "provisioningState": "Succeeded",
+        "diskSizeGB": 128
+      }
+    }
+    ```
+    """)
+  get is ArmResourceRead<Disk>;
+
+  /**
+   * Creates or updates a disk.
+   */
+  @scenario
+  @scenarioDoc("""
+    Test that a client can expose operations from multiple services using older API versions. This operation should be called like this: `client.disks.createOrUpdate(...)`.
+
+    PUT (create or update) a Disk resource.
+    Expected path: /subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/test-rg/providers/Microsoft.Compute/disksOld/disk-old1
+    Expected query parameter: api-version=2024-03-02
+    Expected request body:
+    ```json
+    {
+      "location": "eastus",
+      "properties": {
+        "diskSizeGB": 128
+      }
+    }
+    ```
+    Expected response body:
+    ```json
+    {
+      "id": "/subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/test-rg/providers/Microsoft.Compute/disksOld/disk-old1",
+      "name": "disk-old1",
+      "type": "Microsoft.Compute/disksOld",
+      "location": "eastus",
+      "properties": {
+        "provisioningState": "Succeeded",
+        "diskSizeGB": 128
+      }
+    }
+    ```
+    """)
+  createOrUpdate is ArmResourceCreateOrUpdateAsync<Disk>;
+}