How to do unit testing in the case of access log middleware - unit-testing

Question

I have a middleware to log this service access. But I'm confused to do the unit testing several times I surfed googling. I have not found the right way to solve this
package accesslog
import (
"net/http"
"time"
"github.com/go-chi/chi/middleware"
"transactionService/pkg/log"
)
func Handler(logger log.Logger) func(next http.Handler) http.Handler {
return func(next http.Handler) http.Handler {
fn := func(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
ctx = log.WithRequest(ctx, r)
ww := middleware.NewWrapResponseWriter(w, r.ProtoMajor)
start := time.Now()
defer func() {
logger.With(ctx, "duration", time.Since(start), "status", ww.Status()).
Infof("%s %s %s %d %d", r.Method, r.URL.Path, r.Proto, ww.Status(), ww.BytesWritten())
}()
next.ServeHTTP(ww, r.WithContext(ctx))
}
return http.HandlerFunc(fn)
}
}

Answer 1

solved, this is my code to solve it
package accesslog
import (
"io"
"io/ioutil"
"net/http"
"net/http/httptest"
"testing"
"github.com/go-chi/chi"
"transactionService/pkg/log"
)
func TestHandler(t *testing.T) {
logger, _ := log.NewForTest()
r := chi.NewRouter()
r.Use(Handler(logger))
r.Get("/", func(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(http.StatusOK)
_, _ = w.Write([]byte("test"))
})
ts := httptest.NewServer(r)
defer ts.Close()
if resp, body := testRequest(t, ts, "GET", "/", nil); body != "root" && resp.StatusCode != 200 {
t.Fatalf(body)
}
}
func testRequest(t *testing.T, ts *httptest.Server, method, path string, body io.Reader) (*http.Response, string) {
req, err := http.NewRequest(method, ts.URL+path, body)
if err != nil {
t.Fatal(err)
return nil, ""
}
resp, err := http.DefaultClient.Do(req)
if err != nil {
t.Fatal(err)
return nil, ""
}
respBody, err := ioutil.ReadAll(resp.Body)
if err != nil {
t.Fatal(err)
return nil, ""
}
defer resp.Body.Close()
return resp, string(respBody)
}