1 #define DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN
2 #include "doctest.h"
3 
fact(int n)4 int fact(int n) {
5     return n <= 1 ? n : fact(n - 1) * n;
6 }
7 
8 TEST_CASE("testing the factorial function") {
9     CHECK(fact(0) == 1); // should fail
10     CHECK(fact(1) == 1);
11     CHECK(fact(2) == 2);
12     CHECK(fact(3) == 6);
13     CHECK(fact(10) == 3628800);
14 }
15