Android: checking a button is enabled

I am having problems with testing my app. I created an espresso test which is supposed to fail, since whenever I launch my app in the emulator, I get the expected behavior. There is my test:

 onView(withText("wrong answer")).perform(click());
 onView(withId(R.id.nextQuestionButton)).check(matches(isEnabled()));

When launching the test, nothing is reported, whereas nextQuestionButton should not be enabled upon clicking the radioButton whose text is "wrong answer".