feat: schedule automatic form closure

lib/form-availability.test.ts

@@ -0,0 +1,37 @@
+import { describe, expect, test } from "bun:test";
+import { isFormAcceptingSubmissions } from "@/lib/form-availability";
+
+const now = new Date("2026-07-30T12:00:00.000Z");
+
+describe("isFormAcceptingSubmissions", () => {
+  test("keeps a manually open form without a deadline open", () => {
+    expect(isFormAcceptingSubmissions({ isOpen: true }, now)).toBe(true);
+  });
+
+  test("keeps a form open before its deadline", () => {
+    expect(
+      isFormAcceptingSubmissions(
+        { isOpen: true, closesAt: "2026-07-30T12:00:01.000Z" },
+        now,
+      ),
+    ).toBe(true);
+  });
+
+  test("closes a form when its deadline is reached", () => {
+    expect(
+      isFormAcceptingSubmissions(
+        { isOpen: true, closesAt: "2026-07-30T12:00:00.000Z" },
+        now,
+      ),
+    ).toBe(false);
+  });
+
+  test("manual closure overrides a future deadline", () => {
+    expect(
+      isFormAcceptingSubmissions(
+        { isOpen: false, closesAt: "2026-08-01T12:00:00.000Z" },
+        now,
+      ),
+    ).toBe(false);
+  });
+});