Refactor server stuff

server/testSetup.ts

@@ -0,0 +1,46 @@
+import { startServer } from "./server.ts";
+
+export const hostname = "0.0.0.0";
+export const port = 8042;
+export const href = `ws://${hostname}:${port}`;
+
+export function setup(
+	fn: (ctx: Deno.TestContext) => Promise<void>,
+	handler: Deno.ServeHandler,
+): (ctx: Deno.TestContext) => Promise<void> {
+	return async (ctx) => {
+		const shutdown = startServer(handler, hostname, port);
+		try {
+			await fn(ctx);
+		} finally {
+			await shutdown();
+		}
+	};
+}
+
+export function connect(url: string): Promise<[WebSocket, string[]]> {
+	return new Promise((resolve, reject) => {
+		const messages: string[] = [];
+		const socket = new WebSocket(url);
+
+		socket.onopen = () => resolve([socket, messages]);
+		socket.onerror = (error) => reject(error);
+		socket.onmessage = ({ data }) => {
+			messages.push(data);
+		};
+	});
+}
+
+export function close(socket: WebSocket): Promise<void> {
+	return new Promise((resolve) => {
+		if (socket.readyState === WebSocket.CLOSED) {
+			return resolve();
+		}
+		socket.onclose = () => resolve();
+		socket.close();
+	});
+}
+
+export function flush(): Promise<void> {
+	return new Promise((resolve) => setTimeout(resolve, 0));
+}