diff --git a/lib/cmd/start.js b/lib/cmd/start.js
index c5e2188..f55e060 100644
--- a/lib/cmd/start.js
+++ b/lib/cmd/start.js
@@ -156,7 +156,7 @@ class StartCommand extends Command {
           this.logger.info('%s started on %s', this.frameworkName, msg.data.address);
           child.unref();
           child.disconnect();
-          process.exit(0);
+          this.exit(0);
         }
       });
 
@@ -177,7 +177,7 @@ class StartCommand extends Command {
       [ 'SIGINT', 'SIGQUIT', 'SIGTERM' ].forEach(event => {
         process.once(event, () => {
           signal = event;
-          process.exit(0);
+          this.exit(0);
         });
       });
       process.once('exit', () => {
@@ -246,7 +246,7 @@ class StartCommand extends Command {
     if (!isSuccess) {
       this.child.kill('SIGTERM');
       yield sleep(1000);
-      process.exit(1);
+      this.exit(1);
     }
   }
 }
diff --git a/lib/command.js b/lib/command.js
index c484252..bd53436 100644
--- a/lib/command.js
+++ b/lib/command.js
@@ -59,6 +59,10 @@ class Command extends BaseCommand {
 
     return context;
   }
+
+  exit(code) {
+    process.exit(code);
+  }
 }
 
 module.exports = Command;