Adds Espresso test for checking for a toast

Author: vogella

com.vogella.android.daggerjunitmockito/app/src/androidTest/java/com/vogella/android/daggerjunitmockito/ExampleInstrumentationTest.java

@@ -2,12 +2,20 @@
 
 import android.app.Activity;
 import android.os.Bundle;
+import android.widget.Toast;
+
+import javax.inject.Inject;
 
 public class MainActivity extends Activity {
 
+    @Inject
+    MainService service;
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
+
+        Toast.makeText(this, service.doSomething(), Toast.LENGTH_LONG).show();
     }
 }

com.vogella.android.daggerjunitmockito/app/src/main/java/com/vogella/android/daggerjunitmockito/MainActivity.java

@@ -0,0 +1,40 @@
+package com.vogella.android.test.juntexamples;
+
+import android.support.test.rule.ActivityTestRule;
+import android.support.test.runner.AndroidJUnit4;
+
+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.matches;
+import static android.support.test.espresso.matcher.RootMatchers.withDecorView;
+import static android.support.test.espresso.matcher.ViewMatchers.isDisplayed;
+import static android.support.test.espresso.matcher.ViewMatchers.withText;
+import static org.hamcrest.CoreMatchers.containsString;
+import static org.hamcrest.CoreMatchers.is;
+import static org.hamcrest.CoreMatchers.startsWith;
+import static org.hamcrest.Matchers.greaterThan;
+import static org.hamcrest.Matchers.hasToString;
+import static org.hamcrest.Matchers.instanceOf;
+import static org.hamcrest.Matchers.not;
+import static org.hamcrest.Matchers.notNullValue;
+import static org.junit.Assert.assertThat;
+
+@RunWith(AndroidJUnit4.class)
+public class MainActivityTestList {
+
+    @Rule
+   public ActivityTestRule<MainActivity> rule  = new  ActivityTestRule<>(MainActivity.class);
+
+    @Test
+    public void ensureToastIsDisplayedIfListItemIsClicked() throws Exception {
+        onData(hasToString(containsString("Frodo"))).perform(click());
+        onView(withText(startsWith("Clicked:")))
+                .inRoot(withDecorView(not(is(rule.getActivity().getWindow().getDecorView()))))
+                .check(matches(isDisplayed()));
+    }
+}