Answer Happy

The following code snippet shows an example of an Espresso test:

A. @Rule fun greeterSaysHello() { onView(withId(R.id.name_field)).do(typeText("Steve")) onView(withId(R.id.greet_button)).do(click()) onView(withText("Hello Steve!")).check(matches(isDisplayed())) }
B. @Test fun greeterSaysHello() { onView(withId(R.id.name_field)).perform(typeText("Steve")) onView(withId(R.id.greet_button)).perform(click()) onView(withText("Hello Steve!")).check(matches(isDisplayed())) }
C. @Test fun greeterSaysHello() { onView(withId(R.id.name_field)).do(typeText("Steve")) onView(withId(R.id.greet_button)).do(click()) onView(withText("Hello Steve!")).compare(matches(isDisplayed())) }