diff --git a/index.ts b/index.ts
index 1ec1fc6..bdc8341 100644
--- a/index.ts
+++ b/index.ts
@@ -47,7 +47,7 @@ export default class WSReqonet extends EventEmitter {
     this.ws = new window.WebSocket(url, protocols);
     this.connect();
   }
-  private onOpen = () => {
+  private onopen = () => {
     this.emit("open");
     this.forcedClose = false;
   };
@@ -80,7 +80,7 @@ export default class WSReqonet extends EventEmitter {
   private connect = () => {
     this.ws.onclose = this.onclose;
     this.ws.onerror = this.onError;
-    this.ws.onopen = this.onOpen;
+    this.ws.onopen = this.onopen;
     this.ws.onmessage = this.onmessage;
 
     if (this.queueMessage) {
diff --git a/package.json b/package.json
index 37c8494..15f25dc 100644
--- a/package.json
+++ b/package.json
@@ -21,7 +21,7 @@
     "prepare": "husky install",
     "tsc": "tsc",
     "build": "tsup",
-    "test": "tsd && ava",
+    "test": "tsc && tsd && ava",
     "pretty-quick": "pretty-quick --staged"
   },
   "sideEffects": false,