Handle malformed CommandBoard paths (#76)

apps/commandboard-web/server.test.js

@@ -0,0 +1,31 @@
+import { afterAll, beforeAll, describe, expect, it } from "vitest";
+import { createCommandBoardWebServer } from "./server.js";
+
+let server;
+let baseUrl;
+
+beforeAll(async () => {
+  server = createCommandBoardWebServer();
+  await new Promise((resolve) => server.listen(0, resolve));
+  const address = server.address();
+  if (!address || typeof address === "string") {
+    throw new Error("Expected web server to bind to a local port");
+  }
+  baseUrl = `http://127.0.0.1:${address.port}`;
+});
+
+afterAll(async () => {
+  await new Promise((resolve, reject) => {
+    server.close((error) => (error ? reject(error) : resolve()));
+  });
+});
+
+describe("CommandBoard web server", () => {
+  it("rejects malformed path encoding as a client error", async () => {
+    const response = await fetch(`${baseUrl}/%E0%A4%A`);
+    const body = await response.text();
+
+    expect(response.status).toBe(400);
+    expect(body).toBe("Invalid path encoding");
+  });
+});