if got, want := sqDiff(x, y), orig(x, y); got != want {
				t.Fatalf("sqDiff(%#x, %#x): got %d, want %d", x, y, got, want)
			}
		}
	}
	if err := quick.CheckEqual(orig, sqDiff, &quick.Config{MaxCountScale: 10}); err != nil {
		t.Fatal(err)
	}

// given factor if the -short flag is not set.
func quickCheckConfig(slowScale int) *quick.Config {
	cfg := new(quick.Config)
	if !testing.Short() {
		cfg.MaxCountScale = float64(slowScale)
	}
	return cfg
}

var scOneBytes = [32]byte{1}
var scOne, _ = new(Scalar).SetCanonicalBytes(scOneBytes[:])
var scMinusOne, _ = new(Scalar).SetCanonicalBytes(scalarMinusOneBytes[:])

				scale /= 5
			case "Rand":
				scale /= 10
			case "Exp-XZ", "Exp-XY", "Exp-YZ":
				scale /= 50
			case "ModSqrt":
				scale /= 500
			}
			if err := quick.Check(f, &quick.Config{
				MaxCountScale: scale,
			}); err != nil {
				t.Error(err)
			}
		})
	}