test_rational("-.1", (struct sr_rational){-1, 10});
test_rational(" .1", (struct sr_rational){1, 10});
test_rational("+.1", (struct sr_rational){1, 10});
test_rational("-.1", (struct sr_rational){-1, 10});
test_rational(" .1", (struct sr_rational){1, 10});
test_rational("+.1", (struct sr_rational){1, 10});