diff --git a/tests/fast_int.cpp b/tests/fast_int.cpp
index 2304918..3f1ef72 100644
--- a/tests/fast_int.cpp
+++ b/tests/fast_int.cpp
@@ -38,7 +38,15 @@ int main()
     auto answer = fast_float::from_chars(f.data(), f.data() + f.size(), result);
 
     if (answer.ec != std::errc()) {
-      std::cerr << "1. could not convert to int for input: " << std::quoted(f) << " " << result << " " << answer.ptr << std::endl;
+      if (answer.ec == std::errc::invalid_argument) {
+        std::cerr << "could not convert to int for input: " << std::quoted(f) << "because of invalid arguement, output: " << result << " , ptr: " << answer.ptr << std::endl;
+      }
+      else if (answer.ec == std::errc::result_out_of_range) {
+        std::cerr << "could not convert to int for input: " << std::quoted(f) << "because it's out of range, output: " << result << " , ptr: " << answer.ptr << std::endl;
+      }
+      else {
+        std::cerr << "could not convert to int for input: " << std::quoted(f) << "because of an unknown error, output: " << result << " , ptr: " << answer.ptr << std::endl;
+      }
       return EXIT_FAILURE;
     }
     else if (result != int_basic_test_expected[i]) {