package encoder

import (
	"strings"
	"testing"
)

func TestSvtav1Params(t *testing.T) {
	const base = "film-grain=10:film-grain-denoise=1:scd=1:qm-min=4:qm-max=15:keyint=10s"

	if got := svtav1Params(0); got != base {
		t.Errorf("lp=0 should not append lp:\n got %q\nwant %q", got, base)
	}
	if got := svtav1Params(-1); got != base {
		t.Errorf("lp<0 should not append lp: got %q", got)
	}
	if got := svtav1Params(4); got != base+":lp=4" {
		t.Errorf("lp=4: got %q, want suffix :lp=4", got)
	}
	if got := svtav1Params(4); !strings.HasPrefix(got, base) {
		t.Errorf("lp set should keep the base params intact: got %q", got)
	}
}