diff --git a/CMakeLists.txt b/CMakeLists.txt
index e63ae52..62d360d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -36,3 +36,4 @@ add_subdirectory(GUI)
 add_subdirectory(GUI/host)
 add_subdirectory(texthook)
 add_subdirectory(extensions)
+add_subdirectory(testbed)
diff --git a/testbed/CMakeLists.txt b/testbed/CMakeLists.txt
new file mode 100644
index 0000000..66c9427
--- /dev/null
+++ b/testbed/CMakeLists.txt
@@ -0,0 +1 @@
+add_executable(Testbed WIN32 main.cpp resource.rc)
diff --git a/testbed/main.cpp b/testbed/main.cpp
new file mode 100644
index 0000000..dabe57e
--- /dev/null
+++ b/testbed/main.cpp
@@ -0,0 +1,49 @@
+#include "common.h"
+#include "defs.h"
+#include "resource.h"
+
+wchar_t buffer[1000] = {};
+std::array<int, 10> vars = {};
+
+int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE, LPSTR, int)
+{
+	LoadLibraryW(ITH_DLL);
+
+	ShowWindow(CreateDialogParamW(hInstance, MAKEINTRESOURCEW(IDD_DIALOG1), NULL, [](HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam) -> INT_PTR
+	{
+		switch (uMsg)
+		{
+		case WM_CLOSE:
+		{
+			DestroyWindow(hWnd);
+		}
+		return TRUE;
+		case WM_DESTROY:
+		{
+			PostQuitMessage(0);
+		}
+		return TRUE;
+		case WM_COMMAND:
+		{
+			if (HIWORD(wParam) == EN_CHANGE)
+			{
+				GetWindowTextW((HWND)lParam, buffer, std::size(buffer));
+				try { vars.at(LOWORD(wParam) - IDC_EDIT1) = std::stoi(buffer); }
+				catch (...) {}
+			}
+		}
+		break;
+		}
+		return FALSE;
+	}, 0), SW_SHOW);
+
+	std::thread([] { while (true) lstrlenW(L"こんにちは"); }).detach();
+
+	MSG msg;
+	while (GetMessageW(&msg, NULL, 0, 0) > 0)
+	{
+		TranslateMessage(&msg);
+		DispatchMessageW(&msg);
+	}
+	return 0;
+}
diff --git a/testbed/resource.h b/testbed/resource.h
new file mode 100644
index 0000000..707fe42
--- /dev/null
+++ b/testbed/resource.h
@@ -0,0 +1,27 @@
+//{{NO_DEPENDENCIES}}
+// Microsoft Visual C++ generated include file.
+// Used by testractor.rc
+//
+#define IDD_DIALOG1                     101
+#define IDC_EDIT1                       1000
+#define IDC_EDIT2                       1001
+#define IDC_EDIT3                       1002
+#define IDC_EDIT4                       1003
+#define IDC_EDIT5                       1004
+#define IDC_EDIT6                       1005
+#define IDC_EDIT7                       1006
+#define IDC_EDIT8                       1007
+#define IDC_EDIT9                       1008
+#define IDC_EDIT10                      1009
+#define IDC_STATIC                      -1
+
+// Next default values for new objects
+// 
+#ifdef APSTUDIO_INVOKED
+#ifndef APSTUDIO_READONLY_SYMBOLS
+#define _APS_NEXT_RESOURCE_VALUE        103
+#define _APS_NEXT_COMMAND_VALUE         40001
+#define _APS_NEXT_CONTROL_VALUE         1011
+#define _APS_NEXT_SYMED_VALUE           101
+#endif
+#endif
diff --git a/testbed/resource.rc b/testbed/resource.rc
new file mode 100644
index 0000000..64dd59d
Binary files /dev/null and b/testbed/resource.rc differ