Test extension canvas forwarding

nodejs/test/extension.test.ts

@@ -20,7 +20,7 @@
         process.env.SESSION_ID = "session-123";
         const resumeForExtension = vi
             .spyOn(CopilotClient.prototype, "resumeSessionForExtension")
             .mockResolvedValue({} as any);
 
         await joinSession({ tools: [] });
 
@@ -38,7 +38,7 @@
         process.env.SESSION_ID = "session-123";
         const resumeForExtension = vi
             .spyOn(CopilotClient.prototype, "resumeSessionForExtension")
             .mockResolvedValue({} as any);
 
         await joinSession({ onPermissionRequest: approveAll, suppressResumeEvent: false });
 
@@ -57,4 +57,25 @@
 
         expect(canvas.declaration.id).toBe("counter");
     });
+
+    it("forwards canvas providers when joining as an extension", async () => {
+        process.env.SESSION_ID = "session-123";
+        const resumeForExtension = vi
+            .spyOn(CopilotClient.prototype, "resumeSessionForExtension")
+            .mockResolvedValue({} as any);
+        const canvas = createCanvas({
+            id: "counter",
+            displayName: "Counter",
+            description: "A counter canvas",
+            open: () => ({ url: "https://example.test/counter" }),
+        });
+
+        await joinSession({ canvases: [canvas] });
+
+        expect(resumeForExtension).toHaveBeenCalledWith(
+            "session-123",
+            expect.objectContaining({ canvases: [canvas] }),
+            undefined
+        );
+    });
 });