Add runtime version reporting and display

test/server/dataplane-client.test.js

@@ -6,11 +6,19 @@ test('control uses the dataplane socket protocol', async () => {
   const requests = [];
   const send = async (socketPath, pathname, method) => {
     requests.push(`${method} ${pathname} ${socketPath}`);
-    return { running: pathname !== '/stop', startedAt: 'now' };
+    return {
+      running: pathname !== '/stop',
+      startedAt: 'now',
+      gatewayBackendVersion: '0.1.0',
+      singBoxVersion: '1.12.13',
+    };
   };
 
   const client = createDataplaneClient('/run/dataplane.sock', send);
-  assert.equal((await client.refresh()).running, true);
+  const status = await client.refresh();
+  assert.equal(status.running, true);
+  assert.equal(status.gatewayBackendVersion, '0.1.0');
+  assert.equal(status.singBoxVersion, '1.12.13');
   await client.apply();
   await client.restart();
   assert.equal((await client.stop()).running, false);