Add version preview spector case

packages/typespec-ts/test/azureModularIntegration/azureVersioningPreviewVersion.spec.ts

@@ -0,0 +1,48 @@
+import { assert } from "chai";
+import { PreviewVersionClient } from "./generated/azure/versioning/previewVersion/src/index.js";
+
+describe("PreviewVersionClient Rest Client", () => {
+  let client: PreviewVersionClient;
+
+  beforeEach(() => {
+    client = new PreviewVersionClient({
+      endpoint: "http://localhost:3002",
+      allowInsecureConnection: true
+    });
+  });
+
+  it("should get widget with preview version - includes color property", async () => {
+    // Test @previewVersion with stable operations - should work across all versions
+    // Color is expected in the response because we are using preview version client
+    const result = await client.getWidget("widget-123");
+
+    assert.strictEqual(result?.id, "widget-123");
+    assert.strictEqual(result?.name, "Sample Widget");
+    assert.strictEqual(result?.color, "blue");
+  });
+
+  it("should update widget color - preview-only operation", async () => {
+    // Test @previewVersion with preview-only operations - only available in preview version
+    // This operation can be called because the client uses preview api version
+    const result = await client.updateWidgetColor("widget-123", {
+      color: "red"
+    });
+
+    assert.strictEqual(result?.id, "widget-123");
+    assert.strictEqual(result?.name, "Sample Widget");
+    assert.strictEqual(result?.color, "red");
+  });
+
+  it("should list widgets with color filtering", async () => {
+    // Test @previewVersion with preview-specific parameters
+    // color parameter is only available in preview version
+    const result = await client.listWidgets({
+      name: "test",
+      color: "blue"
+    });
+
+    assert.strictEqual(result.widgets.length, 1);
+    assert.strictEqual(result.widgets[0]?.id, "widget-1");
+    assert.strictEqual(result.widgets[0]?.name, "test");
+  });
+});

packages/typespec-ts/test/azureModularIntegration/generated/azure/versioning/previewVersion/.gitignore

@@ -0,0 +1,6 @@
+/**
+!/src
+/src/**
+!/src/index.d.ts
+!/.gitignore
+!/tspconfig.yaml

packages/typespec-ts/test/azureModularIntegration/generated/azure/versioning/previewVersion/src/index.d.ts

@@ -0,0 +1,46 @@
+import { ClientOptions } from '@azure-rest/core-client';
+import { OperationOptions } from '@azure-rest/core-client';
+import { Pipeline } from '@azure/core-rest-pipeline';
+
+export declare interface GetWidgetOptionalParams extends OperationOptions {
+}
+
+export declare enum KnownApiVersions {
+    V20240101 = "2024-01-01",
+    V20240601 = "2024-06-01",
+    V20241201Preview = "2024-12-01-preview"
+}
+
+export declare interface ListWidgetsOptionalParams extends OperationOptions {
+    name?: string;
+    color?: string;
+}
+
+export declare class PreviewVersionClient {
+    private _client;
+    readonly pipeline: Pipeline;
+    constructor(options?: PreviewVersionClientOptionalParams);
+    listWidgets(options?: ListWidgetsOptionalParams): Promise<{
+        widgets: Widget[];
+    }>;
+    updateWidgetColor(id: string, colorUpdate: UpdateWidgetColorRequest, options?: UpdateWidgetColorOptionalParams): Promise<Widget | null>;
+    getWidget(id: string, options?: GetWidgetOptionalParams): Promise<Widget | null>;
+}
+
+export declare interface PreviewVersionClientOptionalParams extends ClientOptions {
+}
+
+export declare interface UpdateWidgetColorOptionalParams extends OperationOptions {
+}
+
+export declare interface UpdateWidgetColorRequest {
+    color: string;
+}
+
+export declare interface Widget {
+    id: string;
+    name: string;
+    color?: string;
+}
+
+export { }

packages/typespec-ts/test/azureModularIntegration/generated/azure/versioning/previewVersion/tspconfig.yaml

@@ -0,0 +1,11 @@
+emit:
+  - "@azure-tools/typespec-ts"
+options:
+  "@azure-tools/typespec-ts":
+    emitter-output-dir: "{project-root}"
+    add-credentials: false
+    azure-sdk-for-js: false
+    is-modular-library: true
+    package-details:
+      name: "@azure/versioning-preview"
+      version: "1.0.0"

packages/typespec-ts/test/commands/cadl-ranch-list.js

@@ -863,6 +863,10 @@ export const azureModularTsps = [
   {
     outputPath: "azure/client-generator-core/hierarchy-building",
     inputPath: "azure/client-generator-core/hierarchy-building"
+  },
+  {
+    outputPath: "azure/versioning/previewVersion",
+    inputPath: "azure/versioning/previewVersion"
   }
   // skip due to issue https://github.com/Azure/autorest.typescript/issues/3494
   // {