test(daemon-server): blocker must use Node's default listen host to match the daemon

Previous attempt bound the blocker to 0.0.0.0, but Node's default when no
host is passed to server.listen() is the IPv6 wildcard `::` with
IPV6_V6ONLY=true. On macOS and Windows, `::` (IPv6-only) and `0.0.0.0`
(IPv4) do not conflict, so the daemon's bind succeeded and the assertion
failed. Drop the explicit host on the blocker too so it lands on the same
default as express.listen(port) — `::` on dual-stack runners.

Author: Rinse12

test/webui/daemon-server.test.ts

@@ -11,11 +11,11 @@ import { startDaemonServer } from "../../dist/webui/daemon-server.js";
 // The contract we want: if the port can't be bound, startDaemonServer must reject.
 describe("startDaemonServer bind contract", () => {
     it("rejects when the RPC port is already taken (regression for issue #42)", async () => {
-        // Blocker must bind to 0.0.0.0 because express.listen(port) (no host arg) also
-        // binds to 0.0.0.0. On BSD-derived stacks (macOS, Windows) a wildcard bind and
-        // a 127.0.0.1 bind on the same port can coexist, so binding the blocker to
-        // 127.0.0.1 would let the daemon's wildcard bind succeed and the test wouldn't
-        // exercise the EADDRINUSE path.
+        // The blocker must bind the *same way* the daemon does — no host argument —
+        // so it lands on whatever default Node picks for this platform. On macOS and
+        // Windows that default is the IPv6 wildcard `::` with IPV6_V6ONLY=true, which
+        // does NOT conflict with a 0.0.0.0 bind. Binding the blocker to 127.0.0.1 or
+        // 0.0.0.0 would let the daemon's listen succeed there and never hit EADDRINUSE.
         const blocker = net.createServer();
         const port = await new Promise<number>((resolve, reject) => {
             blocker.once("listening", () => {
@@ -24,7 +24,7 @@ describe("startDaemonServer bind contract", () => {
                 else reject(new Error(`unexpected address ${JSON.stringify(addr)}`));
             });
             blocker.once("error", reject);
-            blocker.listen(0, "0.0.0.0");
+            blocker.listen(0);
         });
 
         // Swallow any stray uncaughtException emitted by an unguarded server.listen()