[Android] Load resources from unit test

ResourceHelper.java

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.net.URL;

public class ResourceHelper {

  public String convertFileToString(File file) throws Exception {
    BufferedReader reader = new BufferedReader(new FileReader(file));
    StringBuilder sb = new StringBuilder();
    String line;
    while ((line = reader.readLine()) != null) {
      sb.append(line).append("\n");
    }
    reader.close();
    return sb.toString();
  }

  public String getContentFromFile(String filePath) throws Exception {

    ClassLoader classLoader = getClass().getClassLoader();
    URL resource = classLoader.getResource(filePath);
    File file = new File(resource.getPath());
    return convertFileToString(file);
  }
}