Add assignment

Tests/TestUtils.hpp

@@ -0,0 +1,26 @@
+#ifndef CHESS_ENGINE_TESTS_TESTUTILS_HPP
+#define CHESS_ENGINE_TESTS_TESTUTILS_HPP
+
+#include <optional>
+#include <memory>
+#include <ostream>
+
+template<typename T>
+inline std::ostream& operator<<(std::ostream& os, const std::optional<T>& opt) {
+    if (opt.has_value()) {
+        return os << opt.value();
+    } else {
+        return os << "nullopt";
+    }
+}
+
+template<typename T>
+inline std::ostream& operator<<(std::ostream& os, const std::unique_ptr<T>& ptr) {
+    if (ptr == nullptr) {
+        return os << "nullptr";
+    } else {
+        return os << ptr.get();
+    }
+}
+
+#endif