diff --git a/components/test/testPolyfills.ts b/components/test/testPolyfills.ts
index d5317f6dd01f..1d0077ee8f15 100644
--- a/components/test/testPolyfills.ts
+++ b/components/test/testPolyfills.ts
@@ -7,7 +7,8 @@ import { getMockChrome } from './testData'
 (global as any).window = {} as any
 
 (window as any).localStorage = {
-  getItem: jest.fn()
+  getItem: jest.fn(),
+  setItem: jest.fn()
 } as any
 
 (window as any).location = {