chore: Add tests for CodeHandler (#105)

* chore: Extract test utils to separate file

This makes it possible to reuse the utils in other test files.

* chore: Add tests for CodeHandler

test/TestUtils.hpp

@@ -0,0 +1,80 @@
+/*
+ * Copyright (C) 2025 Povilas Kanapickas
+ *
+ * This file is part of QodeAssist.
+ *
+ * QodeAssist is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * QodeAssist is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with QodeAssist. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <iostream>
+#include <llmcore/ContextData.hpp>
+#include <QString>
+
+QT_BEGIN_NAMESPACE
+
+// gtest can't pick pretty printer when comparing QString
+inline void PrintTo(const QString &value, ::std::ostream *out)
+{
+    *out << '"' << value.toStdString() << '"';
+}
+
+QT_END_NAMESPACE
+
+inline std::ostream &operator<<(std::ostream &out, const QString &value)
+{
+    out << '"' << value.toStdString() << '"';
+    return out;
+}
+
+template<class T>
+std::ostream &operator<<(std::ostream &out, const QVector<T> &value)
+{
+    out << "[";
+    for (const auto &el : value) {
+        out << value << ", ";
+    }
+    out << "]";
+    return out;
+}
+
+template<class T>
+std::ostream &operator<<(std::ostream &out, const std::optional<T> &value)
+{
+    if (value.has_value()) {
+        out << value.value();
+    } else {
+        out << "(no value)";
+    }
+    return out;
+}
+
+namespace QodeAssist::LLMCore {
+
+inline std::ostream &operator<<(std::ostream &out, const Message &value)
+{
+    out << "Message{"
+        << "role=" << value.role << "content=" << value.content << "}";
+    return out;
+}
+
+inline std::ostream &operator<<(std::ostream &out, const ContextData &value)
+{
+    out << "ContextData{"
+        << "\n  systemPrompt=" << value.systemPrompt << "\n  prefix=" << value.prefix
+        << "\n  suffix=" << value.suffix << "\n  fileContext=" << value.fileContext
+        << "\n  history=" << value.history << "\n}";
+    return out;
+}
+
+} // namespace QodeAssist::LLMCore