java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
    at org.robolectric.bytecode.RobolectricInternals.newInstanceOf(RobolectricInternals.java:33)
    at org.robolectric.Robolectric.newInstanceOf(Robolectric.java:345)
    at org.robolectric.shadows.ShadowBitmapFactory.create(ShadowBitmapFactory.java:120)
    at org.robolectric.shadows.ShadowBitmapFactory.decodeFile(ShadowBitmapFactory.java:72)
    at android.graphics.BitmapFactory.decodeFile(BitmapFactory.java)

@Implements(Bitmap.class)
class MyShadowBitmap extends org.robolectric.shadows.ShadowBitmap {

    public MyShadowBitmap() {
        // can also be some other config value
        setConfig(Bitmap.Config.ARGB_8888);
    }

}

public class CustomTestRunner extends RobolectricTestRunner {
    public CustomTestRunner(Class<?> testClass) throws InitializationError {
        super(testClass);
    }
    @Override
       public Setup createSetup() {
           return new MySetup();
       }
    @Override
    protected ShadowMap createShadowMap() {
        return super.createShadowMap()
                .newBuilder()
                .addShadowClass(MyShadowBitmap.class)

                .build();
    }
    }
}

@Test
    @Config(shadows = {
        MyShadowBitmap.class
    })