diff --git a/tests/MockDb.h b/tests/MockDb.h
index 7d200eb1..567866d2 100644
--- a/tests/MockDb.h
+++ b/tests/MockDb.h
@@ -27,6 +27,7 @@
 #define SQLPP_MOCK_DB_H
 
 #include <sstream>
+#include <iostream>
 #include <sqlpp11/serializer_context.h>
 #include <sqlpp11/connection.h>
 
@@ -133,6 +134,7 @@ struct MockDbT: public sqlpp::connection
 		{
 			_serializer_context_t context;
 			::sqlpp::serialize(x, context);
+			std::cout << "Running execute call with\n" << context.str() << std::endl;
 		}
 
 	template<typename Insert>
@@ -140,6 +142,7 @@ struct MockDbT: public sqlpp::connection
 		{
 			_serializer_context_t context;
 			::sqlpp::serialize(x, context);
+			std::cout << "Running insert call with\n" << context.str() << std::endl;
 			return 0;
 		}
 
@@ -148,6 +151,7 @@ struct MockDbT: public sqlpp::connection
 		{
 			_serializer_context_t context;
 			::sqlpp::serialize(x, context);
+			std::cout << "Running update call with\n" << context.str() << std::endl;
 			return 0;
 		}
 
@@ -156,6 +160,7 @@ struct MockDbT: public sqlpp::connection
 		{
 			_serializer_context_t context;
 			::sqlpp::serialize(x, context);
+			std::cout << "Running remove call with\n" << context.str() << std::endl;
 			return 0;
 		}
 
@@ -164,6 +169,7 @@ struct MockDbT: public sqlpp::connection
 		{
 			_serializer_context_t context;
 			::sqlpp::serialize(x, context);
+			std::cout << "Running select call with\n" << context.str() << std::endl;
 			return {};
 		}
 
@@ -195,6 +201,7 @@ struct MockDbT: public sqlpp::connection
 		{
 			_serializer_context_t context;
 			::sqlpp::serialize(x, context);
+			std::cout << "Running prepare execute call with\n" << context.str() << std::endl;
 			return nullptr;
 		}
 
@@ -203,6 +210,7 @@ struct MockDbT: public sqlpp::connection
 		{
 			_serializer_context_t context;
 			::sqlpp::serialize(x, context);
+			std::cout << "Running prepare insert call with\n" << context.str() << std::endl;
 			return nullptr;
 		}
 
@@ -222,6 +230,7 @@ struct MockDbT: public sqlpp::connection
 		{
 			_serializer_context_t context;
 			::sqlpp::serialize(x, context);
+			std::cout << "Running prepare select call with\n" << context.str() << std::endl;
 			return nullptr;
 		}
 
diff --git a/tests/UnionTest.cpp b/tests/UnionTest.cpp
index a5646c55..61436b7d 100644
--- a/tests/UnionTest.cpp
+++ b/tests/UnionTest.cpp
@@ -37,22 +37,12 @@ int main()
 	test::TabBar t;
 	test::TabFoo f;
 
-	auto u = select(t.alpha).from(t).union_distinct(select(f.epsilon).from(f));
+	db(select(t.alpha).from(t).union_distinct(select(f.epsilon).from(f)));
+	db(select(t.alpha).from(t).union_all(select(f.epsilon).from(f)));
 
-	printer.reset();
-	std::cerr << serialize(u, printer).str() << std::endl;
+	auto u = select(t.alpha).from(t).union_all(select(f.epsilon).from(f)).as(sqlpp::alias::u);
 
-	auto ua = select(t.alpha).from(t).union_all(select(f.epsilon).from(f)).as(sqlpp::alias::u);
-
-	printer.reset();
-	std::cerr << serialize(ua, printer).str() << std::endl;
-
-	auto uu = select(all_of(ua)).from(ua).union_all(select(t.delta).from(t));
-
-	printer.reset();
-	std::cerr << serialize(uu, printer).str() << std::endl;
-
-	db(u);
+	db(select(all_of(u)).from(u).union_all(select(t.delta).from(t)));
 
 	return 0;
 }