Simple Go Webserver

main.go

package main

import (
	"io"
	"log"
	"net/http"

	"github.com/go-chi/chi"
)

func main() {
	log.Fatal(http.ListenAndServe(":8080", handler()))
}

func handler() http.Handler {
	r := chi.NewRouter()

	r.Get("/", func(w http.ResponseWriter, r *http.Request) {
		io.WriteString(w, "🚀")
	})

	return r
}

main_test.go

package main

import (
	"io/ioutil"
	"net/http"
	"net/http/httptest"
	"testing"

	"github.com/google/go-cmp/cmp"
)

func TestHandler(t *testing.T) {
	ts := httptest.NewServer(handler())
	defer ts.Close()

	res, err := http.Get(ts.URL)
	if err != nil {
		t.Fatal(err)
	}

	have, err := ioutil.ReadAll(res.Body)
	res.Body.Close()
	if err != nil {
		t.Fatal(err)
	}

	want := []byte("🚀")

	if !cmp.Equal(have, want) {
		t.Errorf("%v", cmp.Diff(have, want))
	}
}