espresso.md

Espresso

How to interact with an Activity

activityScenario.onActivity {
    // Do something with an Activity.
}

How to interact with a Fragment

fragmentScenario.onFragment {
    // Do something with a Fragment.
}

How to move to a state

Unless specified, it moves to RESUMED.

// scenario is ActivityScenario or FragmentScenario.
scenario.moveToState(State.STARTED)

How to recreate an Activity or a Fragment

// scenario is ActivityScenario or FragmentScenario.
scenario.recreate()

How to click a button

onView(withId(R.id.my_button)).perform(click())

// scrollTo() is necessary only if the view is not displayed without scrolling.
onView(withId(R.id.my_button)).perform(scrollTo(), click())

How to check the visibility or existence of a view

onView(withId(R.id.my_view)).check(matches(isDisplayed())) // VISIBLE
onView(withId(R.id.my_view)).check(matches(not(isDisplayed()))) // INVISIBLE
onView(withId(R.id.my_view)).check(doesNotExist()) // GONE or does not exist.

How to check if a view has exactly the same string

onView(withId(R.id.my_view))
.perform(scrollTo()) // Necessary only if the view is not displayed without scrolling.
.check(matches(withText("foo")))

How to check if a view contains a string

onView(withId(R.id.my_view))
.perform(scrollTo()) // Necessary only if the view is not displayed without scrolling.
.check(matches(withText(containsString("foo"))))

How to troubleshoot

• If you see the following error when trying to run an instrumented unit test:
  • java.lang.TypeNotPresentException: Type http://android.support.test.runner.AndroidJUnit4 not present
• Solution
  • Go to Android Studio's menu bar > Run > Edit Configurations > delete all the tests.