Please Following code Junit testing and performance testing screenshot (ss) and code sent me. It can be tested any parameter.

The code :

package hr.miz.evidencijakontakata.Services; import hr.miz.evidencijakontakata.ErrorHandling.CustomError; import hr.miz.evidencijakontakata.Models.DiagnosisModel; import hr.miz.evidencijakontakata.Models.ExposureUrlModel; import hr.miz.evidencijakontakata.Services.CallBackInterface.IHttpCallback; import hr.miz.evidencijakontakata.Services.CallBackInterface.IResponseCallback; import hr.miz.evidencijakontakata.Services.Client.ApiClient; import hr.miz.evidencijakontakata.Services.Interface.IUserService; import hr.miz.evidencijakontakata.Utilities.HttpUtilities; import okhttp3.ResponseBody; import retrofit2.Call; public class UserService { public static void diagnosisKeys(String authCode, DiagnosisModel input, final IResponseCallback callback) { IUserService iservice = ApiClient.getClient().create(IUserService.class); final Call call = iservice.diagnosisKeys(authCode, input); HttpUtilities httpUtilities = new HttpUtilities(); httpUtilities.post(call, new IHttpCallback() { @Override public void onSuccess(Object object) { callback.onSuccess(object); } @Override public void onError(CustomError error) { callback.onError(error); } }); } public static void getExposure(String url, final IResponseCallback callback) { IUserService iservice = ApiClient.getClient().create(IUserService.class); final Call call = iservice.getExposure(url); HttpUtilities httpUtilities = new HttpUtilities(); httpUtilities.post(call, new IHttpCallback() { @Override public void onSuccess(Object object) { callback.onSuccess(object); } @Override public void onError(CustomError error) { callback.onError(error); } }); } public static void getUrls(final IResponseCallback callback) { IUserService iservice = ApiClient.getClient().create(IUserService.class); final Call call = iservice.getUrls(DiagnosisModel.consentToFederation()); HttpUtilities httpUtilities = new HttpUtilities(); httpUtilities.post(call, new IHttpCallback() { @Override public void onSuccess(Object object) { callback.onSuccess(object); } @Override public void onError(CustomError error) { callback.onError(error); } }); } public static void checkGooglePlay(String url, final IResponseCallback callback) { IUserService iservice = ApiClient.getClient().create(IUserService.class); final Call call = iservice.checkGooglePlay(url); HttpUtilities httpUtilities = new HttpUtilities(); httpUtilities.post(call, new IHttpCallback() { @Override public void onSuccess(Object object) { callback.onSuccess(object); } @Override public void onError(CustomError error) { callback.onError(error); } }); } }