Fix random test generator

test/createRandomTest.cpp

@@ -31,6 +31,7 @@
 #include <json_spirit/json_spirit_writer_template.h>
 #include <libdevcore/CommonIO.h>
 #include <libdevcore/CommonData.h>
+#include <libethereum/VMFactory.h>
 #include <libevmcore/Instruction.h>
 #include <libevm/VM.h>
 #include "vm.h"
@@ -128,6 +129,9 @@ void doMyTests(json_spirit::mValue& v)
 		assert(o.count("pre") > 0);
 		assert(o.count("exec") > 0);
 
+
+		auto vmObj = eth::VMFactory::create(eth::VMFactory::Interpreter);
+		auto& vm = *vmObj;
 		dev::test::FakeExtVM fev;
 		fev.importEnv(o["env"].get_obj());
 		fev.importState(o["pre"].get_obj());
@@ -141,9 +145,8 @@ void doMyTests(json_spirit::mValue& v)
 			fev.code = fev.thisTxCode;
 		}
 
+		vm.reset(fev.gas);
 		bytes output;
-		eth::VM vm(fev.gas);
-
 		u256 gas;
 		bool vmExceptionOccured = false;
 		try