src/test/java/org/robolectric/shadows/ViewAnimatorTest.java

package org.robolectric.shadows;

import android.app.Application;
import android.view.View;
import android.widget.ViewAnimator;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.robolectric.Robolectric;
import org.robolectric.TestRunners;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertSame;

@RunWith(TestRunners.WithDefaults.class)
public class ViewAnimatorTest {

    ViewAnimator viewAnimator;
    final Application application = Robolectric.application;

    @Before
    public void setUp() {
        viewAnimator = new ViewAnimator(application);
    }

    @Test
    public void getDisplayedChildWhenEmpty_shouldDefaultToZero() {
        assertEquals(0, viewAnimator.getDisplayedChild());
    }

    @Test
    public void getDisplayedChild_shouldDefaultToZero() {
        viewAnimator.addView(new View(application));
        assertEquals(0, viewAnimator.getDisplayedChild());
    }

    @Test
    public void setDisplayedChild_shouldUpdateDisplayedChildIndex() {
        viewAnimator.addView(new View(application));
        viewAnimator.addView(new View(application));
        viewAnimator.setDisplayedChild(2);
        assertEquals(2, viewAnimator.getDisplayedChild());
    }

    @Test
    public void getCurrentView_shouldWork() {
        View view0 = new View(application);
        View view1 = new View(application);
        viewAnimator.addView(view0);
        viewAnimator.addView(view1);
        assertSame(view0, viewAnimator.getCurrentView());
        viewAnimator.setDisplayedChild(1);
        assertSame(view1, viewAnimator.getCurrentView());
    }

    @Test
    public void showNext_shouldDisplayNextChild() {
        viewAnimator.addView(new View(application));
        viewAnimator.addView(new View(application));
        assertEquals(0, viewAnimator.getDisplayedChild());
        viewAnimator.showNext();
        assertEquals(1, viewAnimator.getDisplayedChild());
        viewAnimator.showNext();
        assertEquals(0, viewAnimator.getDisplayedChild());
    }

    @Test
    public void showPrevious_shouldDisplayPreviousChild() {
        viewAnimator.addView(new View(application));
        viewAnimator.addView(new View(application));
        assertEquals(0, viewAnimator.getDisplayedChild());
        viewAnimator.showPrevious();
        assertEquals(1, viewAnimator.getDisplayedChild());
        viewAnimator.showPrevious();
        assertEquals(0, viewAnimator.getDisplayedChild());
    }
}