diff --git a/autotest/StdString/Etalon.log b/autotest/StdString/Etalon.log
new file mode 100644
index 000000000..0f9547c5e
--- /dev/null
+++ b/autotest/StdString/Etalon.log
@@ -0,0 +1,10 @@
+* C:\upp\out\autotest\MSBT19.Debug.Debug_Full\StdString.exe 03.02.2021 17:43:07, user: cxl
+
+sh = Hello world
+h = Hello world
+v = Hello world
+sh = Hello world
+sh = Hello world
+h = Hello world
+v = Hello world
+sh = Hello world
diff --git a/autotest/StdString/StdString.cpp b/autotest/StdString/StdString.cpp
new file mode 100644
index 000000000..fe4498806
--- /dev/null
+++ b/autotest/StdString/StdString.cpp
@@ -0,0 +1,32 @@
+#include <Core/Core.h>
+
+using namespace Upp;
+
+CONSOLE_APP_MAIN
+{
+	StdLogSetup(LOG_COUT|LOG_FILE);
+	{
+		String h = "Hello world";
+		std::string sh = h;
+		DDUMP(sh);
+		h = sh;
+		DDUMP(h);
+		Value v = sh;
+		DDUMP(v);
+		sh = v;
+		DDUMP(sh);
+	}
+
+	{
+		WString h = "Hello world";
+		std::wstring sh = h;
+		DDUMP(sh);
+		h = sh;
+		DDUMP(h);
+		Value v = sh;
+		DDUMP(v);
+		sh = v;
+		DDUMP(sh);
+	}
+	CheckLogEtalon();
+}
diff --git a/autotest/StdString/StdString.upp b/autotest/StdString/StdString.upp
new file mode 100644
index 000000000..b9fdfb3f8
--- /dev/null
+++ b/autotest/StdString/StdString.upp
@@ -0,0 +1,10 @@
+uses
+	Core;
+
+file
+	Etalon.log,
+	StdString.cpp;
+
+mainconfig
+	"" = "";
+