Support unit tests for federation

src/federation/collection.test.ts

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+import { expect, test } from "bun:test";
+import { Object as APObject, Collection } from "@fedify/fedify";
+import { iterateCollection } from './collection';
+
+test("iteration over empty Collection", async () => {
+  const result: APObject[] = [];
+  for await (const item of iterateCollection(new Collection({}))) {
+    result.push(item);
+  }
+  expect(result).toEqual([]);
+});

src/federation/date.test.ts

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+import { expect, test } from "bun:test";
+import { Temporal } from "@js-temporal/polyfill";
+import { toTemporalInstant, toDate } from "./date";
+
+const date = new Date("2024-08-31T10:00:00");
+const temporalInstant = Temporal.Instant.from(date.toISOString());
+
+test("toTemporalInstant call with null", ()=>{
+  expect(toTemporalInstant(null)).toEqual(null)
+});
+
+test("toTemporalInstant call with Date", ()=>{
+  expect(toTemporalInstant(date)).not.toEqual(null);
+});
+
+test("toDate call with null", ()=>{
+  expect(toDate(null)).toEqual(null);
+});
+
+test("toDate call with Temporal.Instant", ()=>{
+  expect(toDate(temporalInstant)).not.toEqual(null);
+});
+
+test("idempotency test", ()=>{
+  expect(toDate(toTemporalInstant(date))).not.toEqual(null);
+  expect(toTemporalInstant(toDate(temporalInstant))).not.toEqual(null);
+});