public void testFormatSuffixPlural3() {
        try {
            builder.appendSuffix(null, "");
            fail();
        } catch (IllegalArgumentException ex) {}
        try {
            builder.appendSuffix("", null);
            fail();
        } catch (IllegalArgumentException ex) {}
        try {
            builder.appendSuffix(null, null);
            fail();
        } catch (IllegalArgumentException ex) {}
    }