Espresso test for Sunshine. Demo for the Android Testing webcast in the Android Developer Nanodegree.

ForecastListToDetailTest.java

package com.example.android.sunshine.app.ui;

import android.support.test.rule.ActivityTestRule;
import android.support.test.runner.AndroidJUnit4;
import android.test.suitebuilder.annotation.LargeTest;

import com.example.android.sunshine.app.MainActivity;
import com.example.android.sunshine.app.R;

import org.junit.Rule;
import org.junit.Test;
import org.junit.runner.RunWith;

import static android.support.test.espresso.Espresso.onData;
import static android.support.test.espresso.Espresso.onView;
import static android.support.test.espresso.action.ViewActions.click;
import static android.support.test.espresso.assertion.ViewAssertions.doesNotExist;
import static android.support.test.espresso.assertion.ViewAssertions.matches;
import static android.support.test.espresso.matcher.ViewMatchers.isDisplayed;
import static android.support.test.espresso.matcher.ViewMatchers.withId;
import static org.hamcrest.Matchers.anything;


/**
 * For more information on how to use Espresso, check out the documentation and cheat sheet:
 * 
 * - https://google.github.io/android-testing-support-library/docs/espresso/index.html
 * - https://google.github.io/android-testing-support-library/docs/espresso/cheatsheet/index.html
 */
@RunWith(AndroidJUnit4.class)
@LargeTest
public class ForecastListToDetailTest {

    @Rule
    public ActivityTestRule<MainActivity> mActivityTestRule = new ActivityTestRule<>(MainActivity
            .class);

    @Test
    public void testSelectForecast() {
        // we're not displaying the detail view yet
        onView(withId(R.id.detail_day_textview))
                .check(doesNotExist());

        // we are displaying the forecast list
        onView(withId(R.id.listview_forecast))
                .check(matches(isDisplayed()));

        // click on today's forecast list item
        onData(anything())
                .inAdapterView(withId(R.id.listview_forecast))
                .atPosition(0)
                .perform(click());

        // we're displaying the detail view now!
        onView(withId(R.id.detail_day_textview))
                .check(matches(isDisplayed()));
    }


}