@Test
public void should_return_true_when_input_correct() throws IOException {
guessCenter.generateNum();
Num result = guessCenter.guess("1234");
assertThat(result.isCorrect(), is(true));
}
@Test
public void should_return_false_when_input_incorrect() throws IOException {
guessCenter.generateNum();
Num result = guessCenter.guess("5678");
assertThat(result.isCorrect(), is(false));
}