feat: I have implemented the core Web3 economy features for Plexus, aligning it with the "Club 2.0" vision.

server/tests/token.test.js

@@ -0,0 +1,67 @@
+const { expect } = require('chai');
+const io = require('socket.io-client');
+
+const SERVER_URL = 'http://localhost:3000';
+
+describe('Token Economy', function () {
+    this.timeout(5000);
+    let socket;
+    const walletAddress = 'TokenTestWallet_' + Date.now();
+    const username = 'TokenUser_' + Date.now();
+
+    before((done) => {
+        // Ensure server is running (assuming it's started externally or we rely on it)
+        // For this test, we assume the server is running on port 3000 as per package.json start script
+        // If not, we might need to start it here, but usually integration tests assume environment
+
+        socket = io(SERVER_URL);
+        socket.on('connect', done);
+    });
+
+    after((done) => {
+        if (socket.connected) {
+            socket.disconnect();
+        }
+        done();
+    });
+
+    it('should initialize user with 100 PLEXUS', (done) => {
+        socket.emit('join', { walletAddress, username });
+
+        socket.once('balanceUpdated', (data) => {
+            expect(data.balance).to.equal(100);
+            done();
+        });
+    });
+
+    it('should deduct 1 PLEXUS when sending a message', (done) => {
+        // Wait for join to complete if not already
+        // We can just emit sendMessage, but we need to be sure we are joined?
+        // The previous test joined, so we should be good.
+
+        const channelId = 'nebula';
+        const content = 'Hello World';
+        const txId = 'TX_TEST_' + Date.now();
+
+        // Listen for balance update
+        socket.once('balanceUpdated', (data) => {
+            expect(data.balance).to.equal(99);
+            done();
+        });
+
+        socket.emit('sendMessage', { channelId, walletAddress, content, txId });
+    });
+
+    it('should deduct 30 PLEXUS when changing username', (done) => {
+        const newUsername = 'RichUser_' + Date.now();
+        const txId = 'TX_NAME_' + Date.now();
+
+        socket.once('balanceUpdated', (data) => {
+            // 99 - 30 = 69
+            expect(data.balance).to.equal(69);
+            done();
+        });
+
+        socket.emit('updateUsername', { walletAddress, newUsername, txId });
+    });
+});