Android Espresso matching root view

Question

I'm having trouble with matching toast message in one of my activities. In others it works without any problems but in this particular one it does not. I am not aware of any special layout changes that may cause this behavior.

I'm getting following exception:

java.lang.RuntimeException: Waited for the root of the view hierarchy to have window focus and not be requesting layout for over 10 seconds. If you specified a non default root matcher, it may be picking a root that never takes focus. Otherwise, something is seriously wrong. Selected Root:
Root{application-window-token=android.view.ViewRootImpl$W@40dcb2, window-token=android.view.ViewRootImpl$W@40dcb2, has-window-focus=false, layout-params-type=2, layout-params-string=WM.LayoutParams{(0,0)(wrapxwrap) gr=#11 sim=#20 ty=2 fl=#1820002 pfl=0x8 fmt=-3 wanim=0x7f0a0088 surfaceInsets=Rect(0, 0 - 0, 0) mwfl=0x10}, decor-view-string=DecorView{id=-1, visibility=GONE, width=1002, height=348, has-focus=false, has-focusable=false, has-window-focus=false, is-clickable=false, is-enabled=true, is-focused=false, is-focusable=false, is-layout-requested=false, is-selected=false, root-is-layout-requested=false, has-input-connection=false, x=0.0, y=0.0, child-count=1}}
. All Roots:
Root{application-window-token=android.view.ViewRootImpl$W@19481ebd, window-token=android.view.ViewRootImpl$W@19481ebd, has-window-focus=true, layout-params-type=1, layout-params-string=WM.LayoutParams{(0,0)(fillxfill) sim=#2 ty=1 fl=#81810500 pfl=0x8 wanim=0x1030461 surfaceInsets=Rect(0, 0 - 0, 0) mwfl=0x10}, decor-view-string=DecorView{id=-1, visibility=VISIBLE, width=1080, height=1920, has-focus=true, has-focusable=true, has-window-focus=true, is-clickable=false, is-enabled=true, is-focused=false, is-focusable=false, is-layout-requested=false, is-selected=false, root-is-layout-requested=false, has-input-connection=false, x=0.0, y=0.0, child-count=1}}
Root{application-window-token=android.view.ViewRootImpl$W@40dcb2, window-token=android.view.ViewRootImpl$W@40dcb2, has-window-focus=false, layout-params-type=2, layout-params-string=WM.LayoutParams{(0,0)(wrapxwrap) gr=#11 sim=#20 ty=2 fl=#1820002 pfl=0x8 fmt=-3 wanim=0x7f0a0088 surfaceInsets=Rect(0, 0 - 0, 0) mwfl=0x10}, decor-view-string=DecorView{id=-1, visibility=GONE, width=1002, height=348, has-focus=false, has-focusable=false, has-window-focus=false, is-clickable=false, is-enabled=true, is-focused=false, is-focusable=false, is-layout-requested=false, is-selected=false, root-is-layout-requested=false, has-input-connection=false, x=0.0, y=0.0, child-count=1}}
at android.support.test.espresso.base.RootViewPicker.get(RootViewPicker.java:99)
at android.support.test.espresso.ViewInteractionModule.provideRootView(ViewInteractionModule.java:69)
at android.support.test.espresso.ViewInteractionModule_ProvideRootViewFactory.get(ViewInteractionModule_ProvideRootViewFactory.java:23)
at android.support.test.espresso.ViewInteractionModule_ProvideRootViewFactory.get(ViewInteractionModule_ProvideRootViewFactory.java:9)
at android.support.test.espresso.base.ViewFinderImpl.getView(ViewFinderImpl.java:68)
at android.support.test.espresso.ViewInteraction$2.run(ViewInteraction.java:166)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:422)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:5951)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1400)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1195)

I am checking the toast message as following (which does NOT work):

onView(withText(R.string.act_preferences_context_empty))
        .inRoot(withDecorView(not(is(mActivityRule.getActivity().getWindow().getDecorView()))))
        .check(matches(isDisplayed()));

However, when I check the toast like this, it works:

onView(withText(R.string.act_preferences_context_empty))
        .inRoot(not(isFocusable()))
        .check(matches(isDisplayed()));

Could anyone explain this behavior? Thanks.