diff --git a/canvas/src/components/__tests__/PurchaseSuccessModal.test.tsx b/canvas/src/components/__tests__/PurchaseSuccessModal.test.tsx
index 4abdb36c..519942dc 100644
--- a/canvas/src/components/__tests__/PurchaseSuccessModal.test.tsx
+++ b/canvas/src/components/__tests__/PurchaseSuccessModal.test.tsx
@@ -13,7 +13,7 @@
  */
 import React from "react";
 import { render, screen, fireEvent, cleanup, act } from "@testing-library/react";
-import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+import { afterEach, afterAll, beforeEach, beforeAll, describe, expect, it, vi } from "vitest";
 import { PurchaseSuccessModal } from "../PurchaseSuccessModal";
 
 // ─── URL stub helper ───────────────────────────────────────────────────────────
@@ -35,6 +35,40 @@ async function waitForDialog() {
   await act(async () => { await new Promise((r) => setTimeout(r, 50)); });
 }
 
+// ─── Global mocks ─────────────────────────────────────────────────────────────
+
+let replaceStateMock: ReturnType<typeof vi.spyOn>;
+let pushStateMock: ReturnType<typeof vi.spyOn>;
+
+beforeAll(() => {
+  replaceStateMock = vi.spyOn(window.history, "replaceState").mockImplementation(
+    (_s, _u, url) => { if (url) currentUrl = String(url); }
+  );
+  pushStateMock = vi.spyOn(window.history, "pushState").mockImplementation(
+    (_s, _u, url) => { if (url) currentUrl = String(url); }
+  );
+  // Mock window.location as a getter so `new URL(window.location.href)` always
+  // reads the live currentUrl value, not a snapshot made at setup time.
+  Object.defineProperty(window, "location", {
+    get() { return new URL(currentUrl); },
+    configurable: true,
+  });
+});
+
+afterAll(() => {
+  replaceStateMock?.mockRestore();
+  pushStateMock?.mockRestore();
+});
+
+beforeEach(() => {
+  currentUrl = "http://localhost/";
+});
+
+afterEach(() => {
+  cleanup();
+  vi.useRealTimers();
+});
+
 // ─── Tests ────────────────────────────────────────────────────────────────────
 
 describe("PurchaseSuccessModal — render conditions", () => {
@@ -233,4 +267,4 @@ describe("PurchaseSuccessModal — accessibility", () => {
     // Use getByRole which is more reliable than querySelector
     expect(screen.getByRole("button", { name: "Close" })).toBeTruthy();
   });
-});
+});
\ No newline at end of file