public void testGetInstantMillisInvalid() {
        try {
            StringConverter.INSTANCE.getInstantMillis("", (Chronology) null);
            fail();
        } catch (IllegalArgumentException ex) {}
        try {
            StringConverter.INSTANCE.getInstantMillis("X", (Chronology) null);
            fail();
        } catch (IllegalArgumentException ex) {}
    }