Getting Started with Android Programming - Day 57

Write unit test code today

ExampleUnitTest.java

import org.junit.Test;

import static org.junit.Assert.*;

public class ExampleUnitTest {
    @Test
    public void addition_isCorrect() throws Exception {
        assertEquals(4, 2 + 2);
    }
}

SoundViewModelTest.java

import org.junit.Before;
import org.junit.Test;

import static org.hamcrest.core.Is.is;
import static org.junit.Assert.*;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.verify;

public class SoundViewModelTest {
    private BeatBox mBeatBox;
    private Sound mSound;
    private SoundViewModel mSubject;

    @Before
    public void setUp() throws Exception {
        mBeatBox = mock(BeatBox.class);
        mSound = new Sound("assetPath");
        mSubject = new SoundViewModel(mBeatBox);
        mSubject.setSound (mSound);
    }

    @Test
    public void exposesSoundNameAsTitle() {
        assertThat(mSubject.getTitle(), is(mSound.getName()));
    }

    @Test
    public void callsBeatBoxPlayOnButtonClicked() {
        mSubject.onButtonClicked();
        verify(mBeatBox).play(mSound);
    }
}