Add base for menu parsing unit tests

test/ParserTestUtils/Parsing/Mock/MockLexer.h

@@ -0,0 +1,65 @@
+#pragma once
+
+#include <vector>
+#include <iterator>
+
+#include "Utils/ClassUtils.h"
+#include "Parsing/ILexer.h"
+
+template <typename TokenType>
+class MockLexer final : public ILexer<TokenType>
+{
+    // TokenType must inherit IParserValue
+    static_assert(std::is_base_of<IParserValue, TokenType>::value);
+
+    std::vector<TokenType> m_tokens;
+    TokenType m_eof;
+    int m_pop_count;
+
+public:
+    MockLexer(std::initializer_list<Movable<TokenType>> tokens, TokenType eof)
+        : m_tokens(std::make_move_iterator(tokens.begin()), std::make_move_iterator(tokens.end())),
+        m_eof(std::move(eof)),
+        m_pop_count(0)
+    {
+    }
+
+    ~MockLexer() override = default;
+    MockLexer(const MockLexer& other) = delete;
+    MockLexer(MockLexer&& other) noexcept = default;
+    MockLexer& operator=(const MockLexer& other) = delete;
+    MockLexer& operator=(MockLexer&& other) noexcept = default;
+
+    const TokenType& GetToken(const unsigned index) override
+    {
+        if (index < m_tokens.size())
+            return m_tokens[index];
+
+        return m_eof;
+    }
+
+    void PopTokens(const int amount) override
+    {
+        m_pop_count += amount;
+    }
+
+    bool IsEof() override
+    {
+        return !m_tokens.empty();
+    }
+
+    const TokenPos& GetPos() override
+    {
+        return !m_tokens.empty() ? m_tokens[0].GetPos() : m_eof.GetPos();
+    }
+
+    _NODISCARD int GetPopCount() const
+    {
+        return m_pop_count;
+    }
+
+    _NODISCARD ParserLine GetLineForPos(const TokenPos& pos) const override
+    {
+        return ParserLine();
+    }
+};