### Question:
FileConfigSource extends AbstractConfigSource { @Override public Reader getReader() throws IOException { return location.getReader(); } FileConfigSource(final File file);   FileConfigSource(final FileLocation location); @Override Reader getReader(); @Override VisitableLocation getLocation();  }### Answer:
@Test public void testGetReader() throws IOException { final Reader reader = source.getReader(); assertNotNull(reader); assertTrue((reader instanceof FileReader)); }