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 in activity's XML-->
<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 AnimationTestRunner( Class<?> testClass ) throws InitializationError
    {
        super( testClass );
    }

    public static void startFragment( Fragment fragment )
    {
        FragmentManager fragmentManager = new FragmentActivity().getSupportFragmentManager();
        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
        fragmentTransaction.add( fragment, null );
        fragmentTransaction.commit();
    }

    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 ) ) );
}