unit testing - Mock Android Application class for tests using Robolectric in App with Dagger 2 -

i'm complete beginner when comes testing , current task fix issue stops existing tests running.

several tests using robolectric failing error message

java.util.serviceconfigurationerror: org.robolectric.internal.shadowprovider: provider org.robolectric.shadows not subtype     @ java.util.serviceloader.fail(serviceloader.java:239)     @ java.util.serviceloader.access$300(serviceloader.java:185)     @ java.util.serviceloader$lazyiterator.nextservice(serviceloader.java:376)     @ java.util.serviceloader$lazyiterator.next(serviceloader.java:404)     @ java.util.serviceloader$1.next(serviceloader.java:480) 

i read in this github post error can happen if there issues environment configuration. after testing narrow down problem 2 methods in application class, initpicasso , initjobdispatcher, initialize picasso , firebase job running ,

public class myapplication extends application {      private applicationcomponent applicationcomponent;      @override     public void oncreate() {         super.oncreate();          timber.plant(new timber.debugtree());         androidthreeten.init(this);          fabric.with(this, new crashlytics());         initpicasso();          applicationcomponent = daggerapplicationcomponent.builder().applicationmodule(new applicationmodule(this)).build();          initjobdispatcher();     }      void initpicasso() {         final string picasso_cache = "picasso-cache";          file cachedir = new file(getapplicationcontext().getcachedir(), picasso_cache);         if (!cachedir.exists()) {             //noinspection resultofmethodcallignored             cachedir.mkdirs();         }          cache cache = new cache(cachedir, 50 * 1024 * 1024);          httplogginginterceptor httplogginginterceptor = new httplogginginterceptor(new httplogginginterceptor.logger() {             @override             public void log(string message) {                 timber.d("xyz" + message);             }         });         httplogginginterceptor.setlevel(httplogginginterceptor.level.headers);          okhttpclient client = new okhttpclient.builder()                 .addnetworkinterceptor(httplogginginterceptor)                 .cache(cache)                 .build();          picasso.setsingletoninstance(                 new picasso.builder(this)                         .listener(new picasso.listener() {                             @override                             public void onimageloadfailed(picasso picasso, uri uri, exception exception) {                              }                         })                         .downloader(new okhttp3downloader(client))                         .build()         );     }      void initjobdispatcher() {         driver mydriver = new googleplaydriver(this);         firebasejobdispatcher dispatcher = new firebasejobdispatcher(mydriver);          timber.d("setting job at: %s", localdatetime.now().tostring());          job job = dispatcher.newjobbuilder()                 .setservice(syncjobservice.class)                 .settag("my-job-tag")                 .setconstraints(constraint.on_any_network)                 .settrigger(trigger.executionwindow(15, 25))                 .setlifetime(lifetime.until_next_boot)                 .setrecurring(false)                 .build();          int result = dispatcher.schedule(job);         if (result != firebasejobdispatcher.schedule_result_success) {             timber.e("job not scheduled: %d", result);         }     }      public applicationcomponent getapplicationcomponent() {         return applicationcomponent;     } } 

if comment out these 2 methods, tests run fine.

now question is: how can mock application class or @ least these 2 methods? tried create test application class overrides these methods, didn't help.

public class myapplicationtest extends application {      void initpicasso() {         //do nothing here         system.out.println("using myapplicationtest application");     }      void initjobdispatcher() {         //do nothing here     } } 

or project using dagger2, there ways using dagger mock application class? area absolutely new me, advices or suggestions appreciated.