diff --git a/tools/test/include/psemek/test/test.hpp b/tools/test/include/psemek/test/test.hpp
index 9ce12894..5d439d4f 100644
--- a/tools/test/include/psemek/test/test.hpp
+++ b/tools/test/include/psemek/test/test.hpp
@@ -7,6 +7,7 @@
 #include <iostream>
 #include <utility>
 #include <tuple>
+#include <set>
 #include <typeinfo>
 #include <typeindex>
 
@@ -40,6 +41,38 @@ std::ostream & operator << (std::ostream & s, std::tuple<Ts...> const & t)
 	return s;
 }
 
+template <typename T>
+std::ostream & operator << (std::ostream & s, std::vector<T> const & v)
+{
+	s << "[";
+	bool first = true;
+	for (auto const & x : v)
+	{
+		if (!first)
+			s << ", ";
+		first = false;
+		s << x;
+	}
+	s << "]";
+	return s;
+}
+
+template <typename T>
+std::ostream & operator << (std::ostream & s, std::set<T> const & v)
+{
+	s << "{";
+	bool first = true;
+	for (auto const & x : v)
+	{
+		if (!first)
+			s << ", ";
+		first = false;
+		s << x;
+	}
+	s << "}";
+	return s;
+}
+
 namespace psemek::util
 {