diff --git a/packages/designer/jest.config.js b/packages/designer/jest.config.js
index c5f407a6a..d58fe368f 100644
--- a/packages/designer/jest.config.js
+++ b/packages/designer/jest.config.js
@@ -17,6 +17,7 @@ module.exports = {
   collectCoverageFrom: [
     'src/**/*.{ts,tsx}',
     '!src/**/*.d.ts',
+    '!src/icons',
     '!**/node_modules/**',
     '!**/vendor/**',
   ],
diff --git a/packages/designer/src/document/document-model.ts b/packages/designer/src/document/document-model.ts
index 2346ecf25..bd4702f07 100644
--- a/packages/designer/src/document/document-model.ts
+++ b/packages/designer/src/document/document-model.ts
@@ -584,14 +584,10 @@ export class DocumentModel {
     if (['id', 'params', 'layout'].indexOf(name) > -1) {
       throw new Error('addon name cannot be id, params, layout');
     }
-    const i = this._addons?.findIndex((item) => item.name === name);
-    if (i > -1) {
-      this._addons?.splice(i, 1);
+    if (this._addons[name]) {
+      throw new Error(`node addon ${name} exists`);
     }
-    this._addons?.push({
-      exportData,
-      name,
-    });
+    this._addons[name] = exportData;
   }