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";