diff --git a/test/utils/testHelper.ts b/test/utils/testHelper.ts
index 6db4bf62..679069c4 100644
--- a/test/utils/testHelper.ts
+++ b/test/utils/testHelper.ts
@@ -2,7 +2,7 @@
 // Licensed under the MIT license.
 
 import * as sinon from "sinon";
-import { AppConfigurationClient } from "@azure/app-configuration";
+import { AppConfigurationClient, ConfigurationSetting } from "@azure/app-configuration";
 import { ClientSecretCredential } from "@azure/identity";
 import { KeyVaultSecret, SecretClient } from "@azure/keyvault-secrets";
 import * as uuid from "uuid";
@@ -11,7 +11,7 @@ const TEST_CLIENT_ID = "00000000-0000-0000-0000-000000000000";
 const TEST_TENANT_ID = "00000000-0000-0000-0000-000000000000";
 const TEST_CLIENT_SECRET = "0000000000000000000000000000000000000000";
 
-function mockAppConfigurationClientListConfigurationSettings(kvList: any[]) {
+function mockAppConfigurationClientListConfigurationSettings(kvList: ConfigurationSetting[]) {
     function* testKvSetGnerator(kvs: any[]) {
         yield* kvs;
     }
@@ -19,9 +19,18 @@ function mockAppConfigurationClientListConfigurationSettings(kvList: any[]) {
         const keyFilter = listOptions?.keyFilter ?? "*";
         const labelFilter = listOptions?.labelFilter ?? "*";
         const kvs = kvList.filter(kv => {
-            const keyMatched = keyFilter.endsWith("*") ? kv.key.startsWith(keyFilter.slice(0, keyFilter.length - 1)) : kv.key === keyFilter;
-            const labelMatched = labelFilter.endsWith("*") ? kv.label.startsWith(labelFilter.slice(0, labelFilter.length - 1))
-                : (labelFilter === "\0" ? kv.label === null : kv.label === labelFilter); // '\0' in labelFilter, null in config setting.
+            const keyMatched = keyFilter.endsWith("*") ? kv.key.startsWith(keyFilter.slice(0, -1)) : kv.key === keyFilter;
+
+            let labelMatched = false;
+            if (labelFilter === "*") {
+                labelMatched = true;
+            } else if (labelFilter === "\0") {
+                labelMatched = kv.label === undefined;
+            } else if (labelFilter.endsWith("*")) {
+                labelMatched = kv.label !== undefined && kv.label.startsWith(labelFilter.slice(0, -1));
+            } else {
+                labelMatched = kv.label === labelFilter;
+            }
             return keyMatched && labelMatched;
         })
         return testKvSetGnerator(kvs) as any;
@@ -64,36 +73,33 @@ const createMockedTokenCredential = (tenantId = TEST_TENANT_ID, clientId = TEST_
     return new ClientSecretCredential(tenantId, clientId, clientSecret);
 }
 
-const createMockedKeyVaultReference = (key: string, vaultUri: string) => ({
+const createMockedKeyVaultReference = (key: string, vaultUri: string): ConfigurationSetting => ({
     // https://${vaultName}.vault.azure.net/secrets/${secretName}
     value: `{"uri":"${vaultUri}"}`,
     key,
-    label: null,
     contentType: "application/vnd.microsoft.appconfig.keyvaultref+json;charset=utf-8",
-    lastModified: "2023-05-09T08:51:11.000Z",
+    lastModified: new Date(),
     tags: {
     },
     etag: "SPJSMnJ2ph4BAjftWfdIctV2VIyQxtcIzRbh1oxTBkM",
     isReadOnly: false,
 });
 
-const createMockedJsonKeyValue = (key: string, value: any) => ({
+const createMockedJsonKeyValue = (key: string, value: any): ConfigurationSetting => ({
     value: value,
     key: key,
-    label: null,
     contentType: "application/json",
-    lastModified: "2023-05-04T04:32:56.000Z",
+    lastModified: new Date(),
     tags: {},
     etag: "GdmsLWq3mFjFodVEXUYRmvFr3l_qRiKAW_KdpFbxZKk",
     isReadOnly: false
 });
 
-const createMockedKeyValue = (props: {[key: string]: any}) => (Object.assign({
+const createMockedKeyValue = (props: {[key: string]: any}): ConfigurationSetting => (Object.assign({
     value: "TestValue",
     key: "TestKey",
-    label: null,
     contentType: "",
-    lastModified: new Date().toISOString(),
+    lastModified: new Date(),
     tags: {},
     etag: uuid.v4(),
     isReadOnly: false