I forgot about the CMakeFile

CMakeLists.txt

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+# Root cmake file sketch (might change it later)
+# Author: Unai Blazquez
+# License: GPL-3-or-later
+
+cmake_minimum_required(VERSION 3.16)
+project(azkoyen_ipc_test LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+# Core library
+add_library(core
+    src/core/SysfsRead.cxx
+)
+
+target_include_directories(core PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/include)
+
+#tests
+enable_testing()
+add_subdirectory(tests)

include/SysfsRead.hpp

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+// SysfsRead.hpp
+//
+// SPDX-License-Identifier GPL-3.0-or-later
+//  Author: Unai Blazquez Gomez <unaibg2000@gmail.com>
+
+#pragma once
+
+#include <filesystem>
+
+enum class SysfsStatus
+{
+  /// @brief File cannot be opened or does not exist.
+  Unreachable,
+  /// @brief File exists but is just empty.
+  Empty,
+  /// @brief File content indicates taht production is enabled (e.g. "1")
+  Enabled,
+  /// @brief File requests a cooldown ("error: temp too high")
+  ErrorTempTooHigh,
+  /// @brief File contains an UnexpectedValue; producer must not send.
+  UnexpectedValue
+};
+
+class SysfsReader
+{
+ public:
+  /// @brief Construct a SysfsReader bound to a specific input file path.
+  /// @param input_path Path to the sysfs-like input file.
+  explicit SysfsReader(const std::filesystem::path& input_path);
+
+  /// @brief Read and interpret the current status of the input file.
+  ///
+  /// This function never throws on common I/O errors; instead it reports them
+  /// via the SysfsStatus enum.
+  /// @return Interpreted status of the input file
+  SysfsStatus read_status() const;
+
+ private:
+  std::filesystem::path m_path;  // Path to the input file.
+};

tests/test_sysfs_read.cxx

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+#include <gtest/gtest.h>
+
+#include <fstream>
+
+#include "SysfsRead.hpp"