RecyclerViewActions.scrollTo is not working if we use android binding

I tried to use this in espresso but it does not work and it does not scroll at all:
`onView(withId(R.id.my_test_list)).perform(RecyclerViewActions.scrollTo(hasDescendant(withText(testText))));`

the error is:

```
android.support.test.espresso.PerformException: Error performing 'scroll RecyclerView to: holder with view: has descendant: with text: is "test text"' on view 'with id: com.x.x.x/my_test_list'.
at android.support.test.espresso.PerformException$Builder.build(PerformException.java:83)
at android.support.test.espresso.base.DefaultFailureHandler.getUserFriendlyError(DefaultFailureHandler.java:80)
at android.support.test.espresso.base.DefaultFailureHandler.handle(DefaultFailureHandler.java:56)
at android.support.test.espresso.ViewInteraction.runSynchronouslyOnUiThread(ViewInteraction.java:184)
at android.support.test.espresso.ViewInteraction.doPerform(ViewInteraction.java:115)
at android.support.test.espresso.ViewInteraction.perform(ViewInteraction.java:87)
at com.x.x.x.MyTest.myMethod(MyTest.java:147)
at java.lang.reflect.Method.invoke(Native Method)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at android.support.test.internal.statement.UiThreadStatement.evaluate(UiThreadStatement.java:55)
at android.support.test.rule.ActivityTestRule$ActivityStatement.evaluate(ActivityTestRule.java:270)
at org.junit.rules.RunRules.evaluate(RunRules.java:20)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.junit.runners.Suite.runChild(Suite.java:128)
at org.junit.runners.Suite.runChild(Suite.java:27)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at org.junit.runner.JUnitCore.run(JUnitCore.java:115)
at android.support.test.internal.runner.TestExecutor.execute(TestExecutor.java:59)
at android.support.test.runner.AndroidJUnitRunner.onStart(AndroidJUnitRunner.java:262)
at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:2074)
Caused by: java.lang.RuntimeException: Found 0 items matching holder with view: has descendant: with text: is "test text", but position -1 was requested.
at android.support.test.espresso.contrib.RecyclerViewActions$ScrollToViewAction.perform(RecyclerViewActions.java:357)
at android.support.test.espresso.ViewInteraction$1.run(ViewInteraction.java:144)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:457)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at android.os.Handler.handleCallback(Handler.java:789)
at android.os.Handler.dispatchMessage(Handler.java:98)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6541)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)

Tests ran to completion.
```

so I wrote this and this one works for me:

`scrollToFind(activityRule.getActivity(),onView(withText(testText)),R.id.test_list);`

```
public static int getCountFromRecyclerView(@IdRes int RecyclerViewId) {
final int[] COUNT = {0};
Matcher matcher = new TypeSafeMatcher() {
@Override
protected boolean matchesSafely(View item) {
COUNT[0] = ((RecyclerView) item).getAdapter().getItemCount();
return true;
}
@Override
public void describeTo(Description description) {
}
};
onView(allOf(withId(RecyclerViewId),isDisplayed())).check(matches(matcher));
int result = COUNT[0];
COUNT[0] = 0;
return result;
}

public static void scrollToFind(final Activity activity, final ViewInteraction viewInteraction, final int recyclerViewId){

final int result = TestUtils.getCountFromRecyclerView(recyclerViewId) -1;

viewInteraction.withFailureHandler(new FailureHandler() {
@Override
public void handle(Throwable error, Matcher viewMatcher) {
RecyclerView recyclerView = (RecyclerView) activity.findViewById(recyclerViewId);
int last = ((LinearLayoutManager) recyclerView.getLayoutManager()).findLastCompletelyVisibleItemPosition();
if(last == result) {
fail(error.getMessage());
}
onView(ViewMatchers.withId(recyclerViewId)).perform(ViewActions.swipeUp());
scrollToFind(activity,viewInteraction, recyclerViewId);

}
}).perform(click());

}
```

Beginne mit RecyclerViewActions$ScrollToViewAction an der Position im Stacktrace und vergleiche sie mit der gemeldeten android-Binding-Verwendung in MyTest.java:147. Reproduziere den Fehler mit dem gezeigten Matcher und RecyclerView und vergleiche ihn anschließend mit dem benutzerdefinierten scrollToFind-Workaround. Erledigt bedeutet, eine zuverlässige Korrektur für die fehlgeschlagene Scroll-Operation zu identifizieren und zu testen.

Vom Indexierungsmodell aus dem Issue-Text verfasst.