android - Activity replace object with mock -

does has solution, how replace objects in activities mocks? test logic in ondestroy(), hard, since can't inject mocks activity.

i came following solution, it's code smell:

activity's code

 public handler gethandler() {  if (istestcalling()) {      return logouthandler;  }     return null;  }  public void sethandler(handler logouthandler) {   if (istestcalling()) {      this.logouthandler = logouthandler;   } }  private boolean istestcalling() {  return util.istestcalling(); } 

(util class' code somewhere else:)

public static boolean istestcalling() { stacktraceelement[] stacktrace = new exception().getstacktrace(); if (stacktrace.length >= 4) {     return (stacktrace[3].getclassname()).equalsignorecase("com.mypackage.activittestclass"); } return false; } 

test code:

    @mock private handler handler;  private myactivity activity;  @before public void init() {     mockitoannotations.initmocks(this);     activity = activitycontroller.of(robolectric.getshadowsadapter(), new myactivity()).get(); }      @test public void testondestroy() {      activity.oncreate(null);     activity.sethandler(handler);     activity.ondestroy();      verify(handler).removecallbacks(anyobject()); } 

so, can see able replace object (which initialized in oncreate() ) doing workaround, don't solution, since violating encapsulation , code smell.

any solution this?