diff --git a/App/tests/unit/history-filters.test.tsx b/App/tests/unit/history-filters.test.tsx
new file mode 100644
index 0000000..141e003
--- /dev/null
+++ b/App/tests/unit/history-filters.test.tsx
@@ -0,0 +1,36 @@
+import { describe, it, expect, vi } from "vitest";
+import { render, screen } from "@testing-library/react";
+
+// HistoryFilters reads the URL via next/navigation; mock both hooks it uses.
+vi.mock("next/navigation", () => ({
+  useRouter: () => ({ push: vi.fn(), refresh: vi.fn() }),
+  useSearchParams: () => new URLSearchParams(""),
+}));
+
+import { HistoryFilters } from "@/app/(portal)/history/history-filters";
+
+const props = {
+  vessels: [{ id: "v1", name: "Vessel One" }],
+  accounts: [],
+  perPageOptions: [25, 50, 100],
+  defaultPerPage: 25,
+};
+
+describe("HistoryFilters", () => {
+  // Regression guard for issue #136: the "Approved From" / "Approved To" date
+  // filters were removed from PO History. They must not reappear.
+  it("does not render the Approved From / Approved To filters", () => {
+    render(<HistoryFilters {...props} />);
+    expect(screen.queryByText("Approved From")).toBeNull();
+    expect(screen.queryByText("Approved To")).toBeNull();
+  });
+
+  it("still renders the remaining filters (created-date range, cost centre, accounting code, status)", () => {
+    render(<HistoryFilters {...props} />);
+    expect(screen.getByText("From")).toBeInTheDocument();
+    expect(screen.getByText("To")).toBeInTheDocument();
+    expect(screen.getByText("Cost Centre")).toBeInTheDocument();
+    expect(screen.getByText("Accounting Code")).toBeInTheDocument();
+    expect(screen.getByText("Status")).toBeInTheDocument();
+  });
+});