Add test for fetch

library/helpers/fetch.test.ts

@@ -0,0 +1,48 @@
+import * as t from "tap";
+import { createServer, Server } from "http";
+import { fetch } from "./fetch";
+
+let server: Server;
+
+// Start an HTTP server before running tests
+t.beforeEach(async () => {
+  server = createServer((req, res) => {
+    const chunks: Buffer[] = [];
+    req.on("data", (chunk: Buffer) => chunks.push(chunk));
+    req.on("end", () => {
+      const body = Buffer.concat(chunks).toString();
+      res.writeHead(200, { "Content-Type": "application/json" });
+      res.end(JSON.stringify({ method: req.method, body }));
+    });
+  });
+  await new Promise((resolve) => server.listen(0, resolve)); // Start the server asynchronously
+});
+
+// Stop the server after running tests
+t.afterEach(async () => {
+  await new Promise((resolve) => server.close(resolve)); // Stop the server asynchronously
+});
+
+t.test("should make a GET request", async (t) => {
+  const url = new URL(`http://localhost:${(server.address() as any).port}`);
+  const response = await fetch({ url });
+
+  t.equal(response.statusCode, 200);
+  t.same(JSON.parse(response.body), { method: "GET", body: "" });
+});
+
+t.test("should make a POST request with body", async (t) => {
+  const url = new URL(`http://localhost:${(server.address() as any).port}`);
+  const response = await fetch({
+    url,
+    method: "POST",
+    headers: { "Content-Type": "application/json" },
+    body: JSON.stringify({ key: "value" }),
+  });
+
+  t.equal(response.statusCode, 200);
+  t.same(JSON.parse(response.body), {
+    method: "POST",
+    body: '{"key":"value"}',
+  });
+});