TestAssetsUtils.java

package com.khmelenko.lab.varis;

import android.content.Context;
import android.content.res.AssetManager;
import android.content.res.Resources;

import com.khmelenko.lab.varis.util.AssetsUtils;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.robolectric.RobolectricGradleTestRunner;
import org.robolectric.annotation.Config;

import java.io.IOException;
import java.io.InputStream;

import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;

/**
 * Testing AssetsUtils class
 *
 * @author Dmytro Khmelenko (d.khmelenko@gmail.com)
 */
@RunWith(RobolectricGradleTestRunner.class)
@Config(constants = BuildConfig.class, sdk = 21)
public class TestAssetsUtils {

    @Test
    public void testGetProperties() throws IOException {
        final String property = "test";

        Context context = mock(Context.class);
        Resources resources = mock(Resources.class);
        AssetManager assetManager = mock(AssetManager.class);
        InputStream is = mock(InputStream.class);
        when(context.getResources()).thenReturn(resources);
        when(resources.getAssets()).thenReturn(assetManager);
        when(assetManager.open(property)).thenReturn(is);

        AssetsUtils.getProperties(property, context);

        verify(context).getResources();
        verify(resources).getAssets();
        verify(assetManager).open(property);
    }
}