text = "あああ。いいい" + viewHelper.originalHighlightTagPre + "aaa" + viewHelper.originalHighlightTagPost;
        assertEquals("いいい" + viewHelper.highlightTagPre + "aaa" + viewHelper.highlightTagPost, viewHelper.escapeHighlight(text));

        text = "";
        assertEquals("", viewHelper.escapeHighlight(text));

        text = "aaa";

        for (final String field : highlightedFields) {
            final String text = DocumentUtil.getValue(document, field, String.class);
            if (StringUtil.isNotBlank(text)) {
                return escapeHighlight(text);
            }
        }

        return StringUtil.EMPTY;
    }

    /**
     * Escapes HTML and applies highlighting to text.
     * Handles boundary position detection if enabled.