test: add HTTP response code tests (139)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: alexandre-mrt

tests/response-code.test.ts

@@ -0,0 +1,21 @@
+import { describe, expect, test } from "bun:test";
+import { Hono } from "hono";
+
+process.env.DATABASE_URL = ":memory:";
+const { dropRouter } = await import("../src/routes/drop");
+const app = new Hono();
+app.route("/api", dropRouter);
+
+describe("HTTP response codes", () => {
+	test("stats returns 200", async () => {
+		expect((await app.request("/api/stats")).status).toBe(200);
+	});
+
+	test("missing drop returns 404", async () => {
+		expect((await app.request("/api/missing/info")).status).toBe(404);
+	});
+
+	test("no file upload returns 400", async () => {
+		expect((await app.request("/api/upload", { method: "POST" })).status).toBe(400);
+	});
+});