class ExtremeStartup {

    public String answer(String question) {
        if (question == null)
            return teamName;
        Matcher sumMatcher = Pattern.compile(".*what is the sum of (\\d+) and (\\d+)").matcher(question);
        if (sumMatcher.matches()) {
            return String.valueOf(Integer.parseInt(sumMatcher.group(1)) + Integer.parseInt(sumMatcher.group(2)));
        }
        return teamName;
    }

}

class ExtremeStartupTest {

    private final ExtremeStartup server;

    @Test
    public void should_add_numbers() {

        assertEquals(server.answer("what is the sum of 4 and 12"), "16");
    }

}