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test/pages/auth/youtube/callback.test.ts

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+import { vi, describe, it, expect, beforeEach } from "vitest";
+
+// Mock the youtube lib before importing the handler
+vi.mock("../../../../src/lib/youtube", () => {
+  return {
+    getYoutubeAccessToken: vi.fn().mockResolvedValue({
+      access_token: "access123",
+      refresh_token: "refresh123",
+      expires_in: 3600,
+      token_type: "Bearer",
+    }),
+    getYoutubeUser: vi.fn().mockResolvedValue({
+      userId: "user123",
+      displayName: "Test User",
+      profileImageUrl: "http://example.com/img.png",
+    }),
+  };
+});
+
+describe("YouTube callback route", () => {
+  beforeEach(() => {
+    vi.resetAllMocks();
+  });
+
+  it("sets cookies and returns session HTML", async () => {
+    const { GET } = await import("../../../../src/pages/auth/youtube/callback");
+
+    const cookies = { set: vi.fn() } as any;
+    const url = new URL("http://localhost/?code=abc123&state=test_state");
+
+    const res: Response = await GET({ url, cookies } as any);
+
+    expect(res).toBeDefined();
+    expect((res as any).status).toBe(200);
+    expect(res.headers.get("Content-Type")).toBe("text/html");
+
+    const body = await res.text();
+    expect(body).toContain("mixchat_sessions");
+    expect(body).toContain("user123");
+    expect(body).toContain("access123");
+
+    expect(cookies.set).toHaveBeenCalled();
+    expect(cookies.set).toHaveBeenCalledWith(
+      "youtube_token",
+      "access123",
+      expect.any(Object),
+    );
+
+    expect(cookies.set).toHaveBeenCalledWith(
+      "youtube_refresh_token",
+      "refresh123",
+      expect.any(Object),
+    );
+  });
+});