Get asset on test package with ServiceTestCase. (Android)

asset_on_servicetest.java

import android.content.Context;
import android.content.res.AssetManager;
import android.test.ServiceTestCase;

import com.example.android.HogeService;

public class HogeTest extends ServiceTestCase<HogeService>
{
  private Context getTestContext() throws Exception
  {
    return (Context)getClass().getMethod("getTestContext").invoke(this);
  }

  public void testHoge() throws Exception
  {
    AssetManager am = getTestContext().getResources().getAssets();
    java.io.InputStream is = am.open("hoge.txt");
    try {
      // hogehoge
    }
    finally {
      is.close();
    }
  }
}