@@ -16,13 +16,14 @@

 #include <functional>

 #include <sstream>

 #include <iomanip>

+#include <cmath>

 #include "sys_stdlib.h"

 using generator = std::function<std::string()>;

 inline    std::string token_from_int(int x) {

-        int v = x % 1000000;

+        int v = std::abs(x % 1000000);

         std::ostringstream is;

         is << std::setfill('0') << std::setw(6)<< v;

         return is.str();

@@ -12,6 +12,8 @@

 #include <algorithm>

 #include <initializer_list>

 #include <vector>

+#include <climits>

+

 #include "generator.h"

 #include "sys_stdlib.h"

 #include "test_util.h"

@@ -38,7 +40,7 @@ class fake_stdlib : public stdlib_ifc {

 int six_digits()

 {

     // given

-    std::initializer_list<int> samples { 1, 2, 3 };

+    std::initializer_list<int> samples { 1 };

     auto test_stdlib = std::make_shared<fake_stdlib>(samples);

     stdlib stdlib(test_stdlib);

     generator generator = make_generator(stdlib);

@@ -70,10 +72,52 @@ int modulated_source_modulates_tokens() {

     succeed();

 }

+int int_max()

+{

+    // given

+    std::initializer_list<int> samples { INT_MAX };

+    auto test_stdlib = std::make_shared<fake_stdlib>(samples);

+    stdlib stdlib(test_stdlib);

+    generator generator = make_generator(stdlib);

+

+    // when

+    auto actual = generator();

+

+    // then

+    check (actual.size() == 6, "size is wrong");

+    check (std::all_of (actual.begin(), actual.end(), [] (char c) {

+        return c >= '0' && c <= '9';

+    }), "not just digits");

+    succeed();

+}

+

+int int_min()

+{

+    // given

+    std::initializer_list<int> samples { INT_MIN };

+    auto test_stdlib = std::make_shared<fake_stdlib>(samples);

+    stdlib stdlib(test_stdlib);

+    generator generator = make_generator(stdlib);

+

+    // when

+    auto actual = generator();

+

+    // then

+    check (actual.size() == 6, "size is wrong");

+    check (std::all_of (actual.begin(), actual.end(), [] (char c) {

+        return c >= '0' && c <= '9';

+    }), "not just digits");

+    succeed();

+}

+

+

+

 int run_tests()

 {

     test (six_digits);

     test (modulated_source_modulates_tokens);

+    test (int_max);

+    test (int_min);

     succeed();

 }