Fix colors in output of TestSamples (#3332)

test/testsamples.cpp

@@ -101,6 +101,11 @@ private:
             setSettings(set);
         }
 
+#ifndef _WIN32
+        virtual void reportOut(const std::string &outmsg, Color = Color::Reset) override {
+            std::cout << outmsg << std::endl;
+        }
+#endif
     };
 
     void runConsoleCodePageTranslationOnWindows() const {

test/testsuite.cpp

@@ -23,6 +23,7 @@
 #include "redirect.h"
 
 #include <cstdio>
+#include <cctype>
 #include <iostream>
 #include <string>
 
@@ -124,8 +125,10 @@ static std::string writestr(const std::string &str, bool gccStyle = false)
             ostr << "\\t";
         else if (*i == '\"')
             ostr << "\\\"";
-        else
+        else if (std::isprint(static_cast<unsigned char>(*i)))
             ostr << *i;
+        else
+            ostr << "\\x" << std::hex << short{*i};
     }
     if (!str.empty() && !gccStyle)
         ostr << std::endl;