diff --git a/__tests__/lhisp-oauth-client.test.ts b/__tests__/lhisp-oauth-client.test.ts
index d0fbf7d..e452e46 100644
--- a/__tests__/lhisp-oauth-client.test.ts
+++ b/__tests__/lhisp-oauth-client.test.ts
@@ -12,6 +12,7 @@ const clientId = "testClientdId";
 const clientSecret = "testClientSecret";
 const baseClientParams = { apiUrl, authUrl, clientId, clientSecret };
 const basicAuth = `Basic ${Buffer.from(`${clientId}:${clientSecret}`).toString('base64')}`;
+const contentTypeApplicationJson = "application/json";
 
 describe("lhisp-oauth-client", ()=>{
     it("Shout Get Access Token with Standard Config", async ()=>{
@@ -34,7 +35,7 @@ describe("lhisp-oauth-client", ()=>{
             method: "POST",
             headers: {
                 Authorization: basicAuth,
-                'Content-Type': "application/json",
+                'Content-Type': contentTypeApplicationJson,
             }
         }));
     });
@@ -62,7 +63,7 @@ describe("lhisp-oauth-client", ()=>{
             method: "POST",
             headers: {
                 CustomAuthorizationHeader: basicAuth,
-                'Content-Type': "application/json",
+                'Content-Type': contentTypeApplicationJson,
             }
         }));
     });