From f7ff847498d629c05bb206b41a172f6735e2afe6 Mon Sep 17 00:00:00 2001
From: Felix Morgner <felix.morgner@ost.ch>
Date: Thu, 2 Apr 2026 09:51:44 +0200
Subject: kernel/tests: clean up implementation structure

---
 kernel/src/test_support/kapi/cio.cpp | 63 +++++++++++++++++++++---------------
 1 file changed, 37 insertions(+), 26 deletions(-)

(limited to 'kernel/src/test_support/kapi/cio.cpp')

diff --git a/kernel/src/test_support/kapi/cio.cpp b/kernel/src/test_support/kapi/cio.cpp
index 35452d4..4a1cd1f 100644
--- a/kernel/src/test_support/kapi/cio.cpp
+++ b/kernel/src/test_support/kapi/cio.cpp
@@ -1,43 +1,54 @@
+#include "kernel/test_support/cio.hpp"
+
 #include <kapi/cio.hpp>
 
 #include "kernel/test_support/log_buffer.hpp"
 
-#include <iostream>
-#include <string>
-#include <string_view>
+#include <atomic>
+#include <optional>
+#include <stdexcept>
+
+namespace
+{
+
+  auto constinit is_initialized = std::atomic_flag{};
+  auto constinit device = std::optional<kernel::tests::cio::output_device>{};
+
+}  // namespace
 
 namespace kapi::cio
 {
 
-  namespace
+  auto init() -> void
   {
-
-    class test_output_device : public output_device
+    if (is_initialized.test_and_set())
     {
-    public:
-      test_output_device() = default;
-
-      auto write(output_stream stream, std::string_view text) -> void override
-      {
-        auto & standard_stream = stream == output_stream::stdout ? std::cout : std::cerr;
-        standard_stream << text;
-        if (text != "\n")
-        {
-          kernel::tests::log_buffer::append(std::string{text});
-        }
-      }
-    } device{};
-
-  }  // namespace
+      throw std::logic_error("kapi::cio::init() called more than once");
+    }
 
-  auto init() -> void
+    device.emplace();
+    set_output_device(*device);
+  }
+
+}  // namespace kapi::cio
+
+namespace kernel::tests::cio
+{
+
+  auto deinit() -> void
   {
-    set_output_device(device);
+    if (!is_initialized.test())
+    {
+      throw std::logic_error("kapi::cio::deinit() called before kapi::cio::init()");
+    }
+
+    device.reset();
+    is_initialized.clear();
   }
 
-  auto reset() -> void
+  auto log_buffer() -> kernel::tests::log_buffer &
   {
-    kernel::tests::log_buffer::clear();
+    return device->log_buffer();
   }
 
-}  // namespace kapi::cio
\ No newline at end of file
+}  // namespace kernel::tests::cio
\ No newline at end of file
-- 
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