Add JSON definition subscriptions

tests/subscriptions.test.ts

@@ -0,0 +1,25 @@
+import { describe, expect, it } from "vitest";
+import { subscriptionIsDue } from "../src/shared/subscriptions";
+import { validateDefinitionCollection } from "../src/shared/site-definitions";
+
+const definition = {
+  id: "example",
+  name: "Example",
+  urlPatterns: ["https://example.test/*"],
+  requiredSelectors: ["main"],
+  post: { rootSelectors: ["article"], textSelectors: [".content"] }
+};
+
+describe("definition subscriptions", () => {
+  it("validates versioned collections and rejects duplicate IDs", () => {
+    const result = validateDefinitionCollection({ schemaVersion: 1, collectionId: "example-source", name: "Example", definitions: [definition, definition] });
+    expect(result.valid).toBe(false);
+  });
+
+  it("is due when never updated or at least seven days old", () => {
+    const now = Date.parse("2026-08-25T00:00:00Z");
+    expect(subscriptionIsDue({ id: "x", name: "X", url: "https://example.test/x.json", enabled: true, priority: 0 }, now)).toBe(true);
+    expect(subscriptionIsDue({ id: "x", name: "X", url: "https://example.test/x.json", enabled: true, priority: 0, lastSuccessfulUpdate: "2026-08-18T00:00:00Z" }, now)).toBe(true);
+    expect(subscriptionIsDue({ id: "x", name: "X", url: "https://example.test/x.json", enabled: true, priority: 0, lastSuccessfulUpdate: "2026-08-24T00:00:00Z" }, now)).toBe(false);
+  });
+});