Increase entropy in test temp directory name

Author: sipa

src/test/test_bitcoin.cpp

@@ -68,7 +68,7 @@ TestingSetup::TestingSetup(const std::string& chainName) : BasicTestingSetup(cha
 
         RegisterAllCoreRPCCommands(tableRPC);
         ClearDatadirCache();
-        pathTemp = fs::temp_directory_path() / strprintf("test_bitcoin_%lu_%i", (unsigned long)GetTime(), (int)(InsecureRandRange(100000)));
+        pathTemp = fs::temp_directory_path() / strprintf("test_bitcoin_%lu_%i", (unsigned long)GetTime(), (int)(InsecureRandRange(1 << 30)));
         fs::create_directories(pathTemp);
         gArgs.ForceSetArg("-datadir", pathTemp.string());