Go에서 라이브 요청으로 HTTP 서버를 테스트하는 방법은 무엇입니까?

<code class="go">func TestIndex(t *testing.T) {
  // Create server using the router initialized elsewhere.
  ts := httptest.NewServer(router)
  defer ts.Close()

  newreq := func(method, url string, body io.Reader) *http.Request {
    r, err := http.NewRequest(method, url, body)
    if err != nil {
        t.Fatal(err)
    }
    return r
  }

  tests := []struct {
    name string
    r    *http.Request
  }{
    // Test GET and POST requests.
    {name: "1: testing get", r: newreq("GET", ts.URL+"/", nil)},
    {name: "2: testing post", r: newreq("POST", ts.URL+"/", nil)}, // reader argument required for POST
  }
  for _, tt := range tests {
    t.Run(tt.name, func(t *testing.T) {
        resp, err := http.DefaultClient.Do(tt.r)
        defer resp.Body.Close()
        if err != nil {
            t.Fatal(err)
        }
        // check for expected response here.
    })
  }
}</code>