diff --git a/src/tangara/lua/bridge.cpp b/src/tangara/lua/bridge.cpp
index f1b17636..51ad0b62 100644
--- a/src/tangara/lua/bridge.cpp
+++ b/src/tangara/lua/bridge.cpp
@@ -21,6 +21,7 @@
 #include "lua/lua_filesystem.hpp"
 #include "lua/lua_queue.hpp"
 #include "lua/lua_screen.hpp"
+#include "lua/lua_testing.hpp"
 #include "lua/lua_theme.hpp"
 #include "lua/lua_version.hpp"
 #include "lvgl.h"
@@ -47,9 +48,8 @@ namespace lua {
 
 static constexpr char kBridgeKey[] = "bridge";
 
-static auto make_font_cb(const char* name,
-                         int size,
-                         int weight) -> const lv_font_t* {
+static auto make_font_cb(const char* name, int size, int weight)
+    -> const lv_font_t* {
   if (std::string{"fusion"} == name) {
     if (size == 12) {
       return &font_fusion_12;
@@ -87,6 +87,7 @@ auto Bridge::installBaseModules(lua_State* L) -> void {
   RegisterControlsModule(L);
   RegisterDatabaseModule(L);
   RegisterQueueModule(L);
+  RegisterTestingModule(L);
   RegisterFileSystemModule(L);
   RegisterVersionModule(L);
   RegisterThemeModule(L);
diff --git a/src/tangara/lua/lua_testing.cpp b/src/tangara/lua/lua_testing.cpp
new file mode 100644
index 00000000..36f632ce
--- /dev/null
+++ b/src/tangara/lua/lua_testing.cpp
@@ -0,0 +1,40 @@
+/*
+ * Copyright 2024 jacqueline <me@jacqueline.id.au>
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+#include "lua_testing.hpp"
+
+#include "lauxlib.h"
+#include "lua.h"
+
+#include "audio/audio_events.hpp"
+#include "events/event_queue.hpp"
+
+namespace lua {
+
+static auto testing_tone(lua_State* L) -> int {
+  auto freq = luaL_checkinteger(L, 1);
+  events::Audio().Dispatch(
+      audio::PlaySineWave{.frequency = static_cast<uint32_t>(freq)});
+  events::Audio().Dispatch(audio::TogglePlayPause{.set_to = true});
+  return 0;
+}
+
+static const struct luaL_Reg kTestingFuncs[] = {
+    {"tone", testing_tone},
+    {NULL, NULL},
+};
+
+static auto lua_testing(lua_State* state) -> int {
+  luaL_newlib(state, kTestingFuncs);
+  return 1;
+}
+
+auto RegisterTestingModule(lua_State* L) -> void {
+  luaL_requiref(L, "testing", lua_testing, false);
+  lua_pop(L, 1);
+}
+
+}  // namespace lua
diff --git a/src/tangara/lua/lua_testing.hpp b/src/tangara/lua/lua_testing.hpp
new file mode 100644
index 00000000..5251a350
--- /dev/null
+++ b/src/tangara/lua/lua_testing.hpp
@@ -0,0 +1,15 @@
+/*
+ * Copyright 2024 jacqueline <me@jacqueline.id.au>
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+#pragma once
+
+#include "lua.hpp"
+
+namespace lua {
+
+auto RegisterTestingModule(lua_State*) -> void;
+
+}  // namespace lua