feat(http/mw): structured request logger middleware

internal/transport/http/middleware/logger_test.go

@@ -0,0 +1,48 @@
+package middleware
+
+import (
+	"bytes"
+	"encoding/json"
+	"log/slog"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestLogger_LogsRequest(t *testing.T) {
+	var buf bytes.Buffer
+	log := slog.New(slog.NewJSONHandler(&buf, nil))
+
+	chain := RequestID(Logger(log)(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
+		w.WriteHeader(http.StatusNoContent)
+	})))
+
+	rec := httptest.NewRecorder()
+	chain.ServeHTTP(rec, httptest.NewRequest("GET", "/x", nil))
+
+	var line map[string]any
+	require.NoError(t, json.Unmarshal(buf.Bytes(), &line))
+	require.Equal(t, "http", line["msg"])
+	require.Equal(t, "/x", line["path"])
+	require.Equal(t, "GET", line["method"])
+	require.EqualValues(t, http.StatusNoContent, line["status"])
+	require.NotEmpty(t, line["request_id"])
+}
+
+func TestLogger_DefaultStatus200(t *testing.T) {
+	var buf bytes.Buffer
+	log := slog.New(slog.NewJSONHandler(&buf, nil))
+
+	h := Logger(log)(http.HandlerFunc(func(_ http.ResponseWriter, _ *http.Request) {
+		// Handler writes nothing — status should default to 200.
+	}))
+
+	rec := httptest.NewRecorder()
+	h.ServeHTTP(rec, httptest.NewRequest("GET", "/y", nil))
+
+	var line map[string]any
+	require.NoError(t, json.Unmarshal(buf.Bytes(), &line))
+	require.EqualValues(t, http.StatusOK, line["status"])
+}