### Question:
HashTagStrategy implements OutputStrategy { @Override public void build(String tag, OutputStream os) throws IOException { String url = "<a href=\"https: os.write(url.getBytes()); }  @Override void build(String tag, OutputStream os);  }### Answer:
@Test public void testURLConstruction() throws IOException { instance.build("hashTag", out); String result = out.toString(); assertEquals( "<a href=\"https: result); }