Merge pull request #342 from microsoftgraph/copilot/fix-341

fix: Beta SDK default base URL to use beta endpoint instead of v1.0

Author: baywet

packages/msgraph-beta-sdk-tests/baseUrlTest.ts

@@ -0,0 +1,42 @@
+import { describe, it } from 'mocha';
+import { expect } from 'chai';
+import { createGraphBetaServiceClient } from '@microsoft/msgraph-beta-sdk';
+
+// Simple mock request adapter for testing
+class MockRequestAdapter {
+    public baseUrl: string | undefined = undefined;
+    
+    constructor(baseUrl?: string) {
+        this.baseUrl = baseUrl;
+    }
+}
+
+describe("GraphBetaServiceClient Base URL Tests", () => {
+    it("should set default base URL to beta endpoint when undefined", () => {
+        const mockAdapter = new MockRequestAdapter();
+        
+        // Call the function which should set the default base URL
+        createGraphBetaServiceClient(mockAdapter as any);
+        
+        expect(mockAdapter.baseUrl).to.equal("https://graph.microsoft.com/beta");
+    });
+
+    it("should set default base URL to beta endpoint when empty string", () => {
+        const mockAdapter = new MockRequestAdapter("");
+        
+        // Call the function which should set the default base URL
+        createGraphBetaServiceClient(mockAdapter as any);
+        
+        expect(mockAdapter.baseUrl).to.equal("https://graph.microsoft.com/beta");
+    });
+
+    it("should not override existing base URL", () => {
+        const customUrl = "https://custom.graph.endpoint.com/beta";
+        const mockAdapter = new MockRequestAdapter(customUrl);
+        
+        // Call the function which should NOT override the existing URL
+        createGraphBetaServiceClient(mockAdapter as any);
+        
+        expect(mockAdapter.baseUrl).to.equal(customUrl);
+    });
+});

packages/msgraph-beta-sdk/graphBetaServiceClient.ts

@@ -13,7 +13,7 @@ export interface GraphBetaServiceClient extends BaseRequestBuilder<GraphBetaServ
  */
 export function createGraphBetaServiceClient(requestAdapter: RequestAdapter) {
     if (requestAdapter.baseUrl === undefined || requestAdapter.baseUrl === "") {
-        requestAdapter.baseUrl = "https://graph.microsoft.com/v1.0";
+        requestAdapter.baseUrl = "https://graph.microsoft.com/beta";
     }
     const pathParameters: Record<string, unknown> = {
         "baseurl": requestAdapter.baseUrl,