Chariot Blog Android Unit Testing With Robolectric

ActivityStart.java

@Test
public void buttonClickShouldStartNewActivity() throws Exception {
    Button button = activity.findViewById(R.id.next_screen_button);
    button.performClick();
    Intent intent = NewActivity.createIntent(activity);
    assertThat(activity, new StartedMatcher(intent));
}

DrawableResource.java

@Test
public void imageShouldEqualResourceDrawable() throws Exception {
    ImageView image = (ImageView) activity.findViewById(R.id.sun_earth_image);
    assertThat(image.getDrawable(),
               equalTo(getResourceDrawable(R.drawable.sun_earth)));
}

FragmentPresence.java

@Test
public void shouldHaveNewFragment() throws Exception
{
    NewActivity newActivity = new NewActivity();
    assertNotNull( newActivity.getSupportFragmentManager().findFragmentById( R.id.new_fragment ) );
}

<!--Fragment XML declaration-->
<fragment
    android:id="@+id/new_fragment"
    android:name="com.colabug.NewFragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent"/>

MockFunctionality.java

// Test that certain functionality was called
@Test
public void buttonShouldDoSomethingCrazy() throws Exception {
    button.performClick();
    assertTrue(activity.conditionWasMet);
}

// Mock class
class TestNewActivity extends NewActivity {
    protected boolean conditionWasMet = false;

     @Override
     protected void doSomethingCrazy() {
        conditionWasMet = true;
    }
}

// Original class
public class NewActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.new_activity);

        View button = findViewById(R.id.crazy_button);
        button.setOnClickListener(new View.OnClickListener() {
            public void onClick(View view) {
                doSomethingCrazy();
            }
        });
    }

    protected void doSomethingCrazy() {}
}

Nullness.java

@Test
public void shouldNotBeNull() throws Exception {
    MyActivity activity = new MyActivity();
    assertNotNull(activity);
}

Presence.java

@Test
public void shouldHaveWelcomeText() throws Exception {
    TextView welcomeText = (TextView) activity.findViewById(R.id.welcome_text_view);    
    assertViewIsVisible(welcomeText);
}

ProjectTestRunner.java

public class ProjectTestRunner extends RobolectricTestRunner {

    public ProjectTestRunner(Class<?> testClass) throws InitializationError {
        super(testClass);
    }

    public static String getResourceString(int resourceId) {
        return Robolectric.application.getApplicationContext().getString(resourceId);
    }

    public static Drawable getResourceDrawable(int resourceId) {
        return Robolectric.application.getApplicationContext().getResources().getDrawable(resourceId);
    }

    public static void assertViewIsVisible(View view) {
        assertNotNull(view);
        assertThat(view.getVisibility(), equalTo(View.VISIBLE));
    }

    public static void assertViewIsHidden(View view) {
        assertNotNull(view);
        assertThat(view.getVisibility(), equalTo(View.GONE));
    }
}

RevealFunctionality.java

@Before
public void setUp() throws Exception {
    MyActivity activity = new MyActivity();
    activity.onCreate(null);

    ImageView image = (ImageView) activity.findViewById(R.id.sun_earth_image);
    Button button = (Button) activity.findViewById(R.id.next_screen_button);
}

@Test
public void shouldHaveHiddenButton() throws Exception {
    assertViewIsHidden(button);
}

@Test
public void shouldShowButtonAfterImageClick() throws Exception {
    image.performClick();
    assertViewIsVisible(button);
}

StringResource.java

@Test
public void welcomeTextShouldEqualResource() throws Exception {
    TextView welcomeText = (TextView) activity.findViewById(R.id.welcome_text_view);    
    assertThat(welcomeText.getText().toString(),
               equalTo(getResourceString(R.string.WELCOME_STRING)));
}

Toasting.java

@Test
public void welcomeTextClickShouldToastUser() throws Exception {
    TextView welcomeText = (TextView) activity.findViewById(R.id.welcome_text_view);    
    welcomeText.performClick();
    assertThat(getTextOfLatestToast(),
               equalTo(getResourceString(R.string.WELCOME_TOAST)));
}