Testing the HTTP handler

The testing of the HTTP server could be complicated. The Go standard library simplifies this with a handy package, net/http/httptest. This recipe describes how to utilize this package to test the HTTP handlers.

How to do it...

1. Open the console and create the folder chapter11/recipe05.
2. Navigate to the directory.
3. Create the file sample_test.go with the following content:

        package main

        import (
          "fmt"
          "io/ioutil"
          "net/http"
          "net/http/httptest"
          "testing"
          "time"
        )

        const cookieName = "X-Cookie"

        func HandlerUnderTest(w http.ResponseWriter, r *http.Request) {
          http.SetCookie(w, &http.Cookie{
            Domain: "localhost",
            Expires: time.Now().Add(3 * time.Hour),
            Name: cookieName,
          })
          r.ParseForm()
          username := r.FormValue("username")
          fmt.Fprintf(w, "Hello %s!", username)
        }

        func TestHttpRequest...