Address comment

Author: opieter-aws

packages/core/src/test/testAuthUtil.ts

@@ -10,9 +10,6 @@ import { LanguageClientAuth } from '../auth/auth2'
 import { AuthUtil } from '../codewhisperer/util/authUtil'
 
 export async function createTestAuthUtil() {
-    sinon.restore()
-    AuthUtil.destroy()
-
     const encryptionKey = crypto.randomBytes(32)
 
     const jwe = await new jose.CompactEncrypt(new TextEncoder().encode(JSON.stringify({ your: 'mock data' })))
@@ -42,5 +39,8 @@ export async function createTestAuthUtil() {
         encryptionKey,
     }
 
+    // Since AuthUtil is a singleton, we want to remove an existing instance before setting up a new one
+    AuthUtil.destroy()
+
     AuthUtil.create(mockLspAuth as LanguageClientAuth)
 }