diff --git a/upptst/Zlib/Zlib.cpp b/upptst/Zlib/Zlib.cpp
new file mode 100644
index 000000000..2c5b545a0
--- /dev/null
+++ b/upptst/Zlib/Zlib.cpp
@@ -0,0 +1,33 @@
+#include <Core/Core.h>
+
+using namespace Upp;
+
+String RandomString(int len)
+{
+	StringBuffer r;
+	for(int i = 0; i < len; i++)
+		if(Random(30) == 0)
+			r.Cat("\r\n");
+		else
+			r.Cat(Random(64) + 32);
+	return r;
+}
+
+CONSOLE_APP_MAIN
+{
+	StdLogSetup(LOG_FILE|LOG_COUT);
+
+	String data = RandomString(2000000);
+	
+	ASSERT(ZDecompress(ZCompress(data)) == data);
+	ASSERT(GZDecompress(GZCompress(data)) == data);
+	
+	String path = GetHomeDirFile("test.txt");
+	SaveFile(path, data);
+	GZCompressFile(path);
+	GZDecompressFile(path + ".2", path + ".gz");
+	
+	ASSERT(LoadFile(path + ".2") == data);
+
+	LOG("============= OK");
+}
diff --git a/upptst/Zlib/Zlib.upp b/upptst/Zlib/Zlib.upp
new file mode 100644
index 000000000..985102753
--- /dev/null
+++ b/upptst/Zlib/Zlib.upp
@@ -0,0 +1,9 @@
+uses
+	Core;
+
+file
+	Zlib.cpp;
+
+mainconfig
+	"" = "SSE2";
+
diff --git a/upptst/Zlib/init b/upptst/Zlib/init
new file mode 100644
index 000000000..a34d4c8a3
--- /dev/null
+++ b/upptst/Zlib/init
@@ -0,0 +1,4 @@
+#ifndef _Zlib_icpp_init_stub
+#define _Zlib_icpp_init_stub
+#include "Core/init"
+#endif