private static void test(String fs) {
Formatter f = new Formatter(new StringBuilder(), Locale.US);
f.format(fs, "fail");
ck(fs, "fail", f.toString());
}
private static void test(Locale l, String fs, String exp, Object... args) {
Formatter f = new Formatter(new StringBuilder(), l);
f.format(fs, args);
ck(fs, exp, f.toString());
}