Testing HTTP servers
The net/http/httptest package complements the testing package by providing HTTP server testing facilities that allow you to create test HTTP servers quickly.
For this section, suppose we extend our sorting function by converting it to an HTTP service, as given here:
package service
import (
    "encoding/json"
    "io"
    "net/http"
    "time"
    "github.com/PacktPublishing/Go-Recipes-for-Developers/src/chp17/
    sorting/sort"
)
// Common handler function for parsing the input, sorting, and
// preparing the output
func HandleSort(w http.ResponseWriter, req *http.Request, ascending bool) {
    var input []time.Time
    data, err := io.ReadAll(req.Body)
    if err != nil {
        http.Error...
