Errors: Add HTTP writer for errutil.Error (#57661)

pkg/util/errutil/errhttp/writer_test.go

@@ -0,0 +1,29 @@
+package errhttp
+
+import (
+	"context"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"github.com/grafana/grafana/pkg/util/errutil"
+)
+
+func TestWrite(t *testing.T) {
+	ctx := context.Background()
+	const msgID = "test.thisIsExpected"
+	base := errutil.NewBase(errutil.StatusTimeout, msgID)
+	handler := func(writer http.ResponseWriter, request *http.Request) {
+		Write(ctx, base.Errorf("got expected error"), writer)
+	}
+
+	req := httptest.NewRequest("GET", "http://localhost:3000/fake", nil)
+	recorder := httptest.NewRecorder()
+
+	handler(recorder, req)
+
+	assert.Equal(t, http.StatusGatewayTimeout, recorder.Code)
+	assert.JSONEq(t, `{"message": "Timeout", "messageId": "test.thisIsExpected", "statusCode": 504}`, recorder.Body.String())
+}