Fix gtest printing

Signed-off-by: Konrad Breitsprecher <Konrad.Breitsprecher@vector.com>

Author: KonradBreitsprecherBkd

SilKit/IntegrationTests/ITest_DynStepSizes.cpp

@@ -8,24 +8,14 @@
 #include <chrono>
 #include <iostream>
 
-#include "ITestFixture.hpp"
-
 using namespace std::chrono_literals;
 
-template <typename Rep, typename Period>
-inline std::ostream& operator<<(std::ostream& out, const std::chrono::duration <Rep, Period> timestamp)
-{
-    auto ns = std::chrono::duration_cast<std::chrono::nanoseconds>(timestamp);
-    out << ns.count() << "ns";
-    return out;
-}
-
+namespace std {
 template <typename Rep, typename Period>
 void PrintTo(const std::chrono::duration<Rep, Period>& d, std::ostream* os)
 {
     *os << std::chrono::duration_cast<std::chrono::nanoseconds>(d).count() << "ns";
 }
-
 template <typename R1, typename P1, typename R2, typename P2>
 inline void PrintTo(const std::pair<std::chrono::duration<R1, P1>, std::chrono::duration<R2, P2>>& p, std::ostream* os)
 {
@@ -35,6 +25,8 @@ inline void PrintTo(const std::pair<std::chrono::duration<R1, P1>, std::chrono::
     PrintTo(p.second, os);
     *os << ")";
 }
+} // namespace std
+
 inline std::string ToString(const std::chrono::nanoseconds& ns)
 {
     std::ostringstream os;
@@ -52,7 +44,7 @@ inline std::string ToString(const std::pair<std::chrono::nanoseconds, std::chron
     return os.str();
 }
 
-#include "gtest/gtest.h"
+#include "ITestFixture.hpp"
 
 namespace {