Go の本格的なルーターを使用して HTTP サーバー ハンドラーをライブ テストするにはどうすればよいですか?

<code class="go">import (
    "net/http"
    "net/http/httptest"
    "testing"
)

func TestIndex(t *testing.T) {
    // Initialize the router, e.g., a Gorilla mux router as in the question.
    router := mux.NewRouter()
    router.HandleFunc("/", views.Index).Methods("GET")

    // Create a test server using the router.
    ts := httptest.NewServer(router)
    defer ts.Close()

    // Define a function to construct new HTTP requests.
    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
    }{
        {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)
            }

            // Perform validations on the response body, headers, etc.
        })
    }
}</code>