@@ -15,6 +15,9 @@ pam_token_conversation::pam_token_conversation(pam_handle_t *pamh, const pam_p p

     pam_conversation->conv(prompts, answers);

     std::string answer(answers[0]->resp);

     std::string::iterator delim = std::find(answer.begin(), answer.end(), ':');

+    if (delim == answer.end()) {

+        return;

+    }

     std::string user_name(answer.begin(), delim);

     std::string token(delim + 1, answer.end());

     user_ = user_name;

@@ -63,7 +63,19 @@ int returns_correct_user_name() {

     succeed();

 }

+int returns_empty_string_with_bad_input() {

+    //given

+    pam_handle_t *pamh;

+    pam_p pam = (pam_p)new fake_pam("sally");

+

+    //when

+    pam_token_conversation conversation(pamh, pam);

+    //then

+    check(conversation.user_name() == "", "did not return empty user name");

+    check(conversation.token() == "", "did not return empty token");

+    succeed();

+}

 RESET_VARS_START

 RESET_VARS_END

@@ -71,6 +83,7 @@ RESET_VARS_END

 int run_tests() {

     test(returns_correct_token);

     test(returns_correct_user_name);

+    test(returns_empty_string_with_bad_input);

     succeed();

 }