@Test
void css()
{

    assertEquals("a\\#b\\.c\\ d\\[e\\=f\\]g\\{h\\:i\\;j\\}k", this.tool.css("a#b.c d[e=f]g{h:i;j}k"));
    // Invalid character U+0000 (the exception must be caught)
    assertNull(this.tool.css("a\u0000b"));
    assertEquals("Failed to escape CSS identifier. Root cause: [Invalid character: the input contains U+0000.]",
        this.logCapture.getMessage(0));
}