package main

import (
	"strings"
	"testing"
)

func TestLiveCaptionDisplayTextFitsOverlayBuffer(t *testing.T) {
	input := strings.Repeat("这是一句实时字幕", 12)
	got := liveCaptionDisplayText(input)
	if got == "" {
		t.Fatal("caption should not be empty")
	}
	if len([]byte(got)) > liveCaptionMaxBytes {
		t.Fatalf("caption bytes = %d, want <= %d", len([]byte(got)), liveCaptionMaxBytes)
	}
	if !strings.HasPrefix(got, "...") {
		t.Fatalf("caption = %q, want leading truncation marker", got)
	}
}