feat(http/mw): recover middleware with structured panic log

internal/transport/http/middleware/recover_test.go

@@ -0,0 +1,35 @@
+package middleware
+
+import (
+	"bytes"
+	"log/slog"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestRecover_PanicReturns500(t *testing.T) {
+	var buf bytes.Buffer
+	log := slog.New(slog.NewJSONHandler(&buf, nil))
+
+	h := Recover(log)(http.HandlerFunc(func(_ http.ResponseWriter, _ *http.Request) {
+		panic("boom")
+	}))
+
+	rec := httptest.NewRecorder()
+	h.ServeHTTP(rec, httptest.NewRequest("GET", "/", nil))
+	require.Equal(t, http.StatusInternalServerError, rec.Code)
+	require.Contains(t, buf.String(), "boom")
+}
+
+func TestRecover_NoPanic_PassThrough(t *testing.T) {
+	log := slog.New(slog.NewJSONHandler(&bytes.Buffer{}, nil))
+	h := Recover(log)(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
+		w.WriteHeader(http.StatusNoContent)
+	}))
+	rec := httptest.NewRecorder()
+	h.ServeHTTP(rec, httptest.NewRequest("GET", "/", nil))
+	require.Equal(t, http.StatusNoContent, rec.Code)
+}