feat(test): add jest test suite

tests/server/ecosystem.config.js

@@ -0,0 +1,18 @@
+const { name } = require('./package.json');
+const path = require('path');
+
+module.exports = {
+  apps: [
+    {
+      name,
+      script: path.resolve(__dirname, './dist/index.js'),
+      instances: require('os').cpus().length,
+      autorestart: true,
+      watch: true,
+      env_production: {
+        NODE_ENV: 'production',
+        PORT: 8080,
+      },
+    },
+  ],
+};