) {
    const char = String.fromCodePoint(codepoint);
    const codepointName = "U+" + codepoint.toString(16).padStart(4, "0");
    test(()=>{
        const withSpace = document.querySelector(".a b");
        document.querySelector("#foo").setAttribute("class", `.a${char}b`);
        try {
            var withChar = document.querySelector(`.a${char}b`);
        } catch(e) {
            assert_true(true, `${codepointName} isn't valid in a selector at all`);
            return;
        }
        assert_not_eq