package httpx

import (
	"bytes"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"
)

func TestDecodeJSONRejectsOversizeBody(t *testing.T) {
	t.Parallel()
	payload := `{"password":"` + strings.Repeat("a", 2<<20) + `"}`
	req := httptest.NewRequest(http.MethodPost, "/x", strings.NewReader(payload))
	var dst struct {
		Password string `json:"password"`
	}
	err := DecodeJSON(req, &dst)
	if err == nil {
		t.Fatal("want error for 2 MiB JSON body")
	}
	if !IsBodyTooLarge(err) {
		t.Fatalf("want IsBodyTooLarge, got %v", err)
	}
}

func TestDecodeJSONAcceptsSmallBody(t *testing.T) {
	t.Parallel()
	req := httptest.NewRequest(http.MethodPost, "/x", bytes.NewReader([]byte(`{"password":"ok"}`)))
	var dst struct {
		Password string `json:"password"`
	}
	if err := DecodeJSON(req, &dst); err != nil {
		t.Fatal(err)
	}
	if dst.Password != "ok" {
		t.Fatalf("password=%q", dst.Password)
	}
}