mongo/jstests/replsets/localhost3.js

// Test ReplSet default initiate with localhost-only binding
// @tags: [multiversion_incompatible]

import {ReplSetTest} from "jstests/libs/replsettest.js";

// Select localhost when binding to localhost
const rt = new ReplSetTest({name: "rsLocal", nodes: 1});
const primary = rt.startSet({bind_ip: undefined})[0];
const db = primary.getDB("admin");
const resp = assert.commandWorked(db.adminCommand({replSetInitiate: undefined}));
assert(resp.me.startsWith("localhost:"), tojson(resp.me) + " should start with localhost:");

// Wait for the primary to complete its election before shutting down the set.
assert.soon(() => db.runCommand({hello: 1}).isWritablePrimary);
rt.stopSet();