test(getNextEpisodeSchedule): add test case for /next-episode-schedule endpoint

test/nextEpisodeSchedule.test.ts

@@ -0,0 +1,14 @@
+import { expect, test } from "vitest";
+import { HiAnime } from "aniwatch";
+
+// npx vitest run nextEpisodeSchedule.test.ts
+test("returns anime next episode schedule", async () => {
+    const hianime = new HiAnime.Scraper();
+
+    const animeId = "one-piece-100";
+    const data = await hianime.getNextEpisodeSchedule(animeId);
+
+    expect(data.airingISOTimestamp).not.toEqual(null);
+    expect(data.airingTimestamp).not.toEqual(null);
+    expect(data.secondsUntilAiring).not.toEqual(null);
+});