diff --git a/output/Lua/UnitTests/Joypad_RoundTrip.lua b/output/Lua/UnitTests/Joypad_RoundTrip.lua
new file mode 100644
index 0000000000..dcded4b8f1
--- /dev/null
+++ b/output/Lua/UnitTests/Joypad_RoundTrip.lua
@@ -0,0 +1,137 @@
+console.clear()
+console.writeline("Unit test for joypad.get and joypad.set")
+console.writeline("Core Required: NES (or any multi-player core with U,D,L,R,select,start,A,B as buttons)")
+console.writeline("")
+
+local test_event
+local test_function
+local test_frame = 0
+
+function test_1()
+  -- clear previous input
+  if test_frame < 4 then
+    return
+  end
+
+  local test_case = "test_1: set/get round trip"
+  local test_result = false
+
+  -- set expected input
+  joypad.set({ ["P1 A"] = true, ["P1 B"] = true, ["P1 Select"] = true })
+
+  -- get actual input
+  local t = joypad.get()
+
+  -- assert_equal
+  if t["P1 A"] and t["P1 B"] and t["P1 Select"] then
+    test_result = true
+  end
+
+  -- finish
+  console.writeline(string.format("%s (%s): %s", test_case, test_event, test_result and "OK" or "FAILED"))
+  -- if not test_result then
+  --   console.writeline("Returned Value:")
+  --   console.writeline(t)
+  -- end
+
+  return next_test()
+end
+
+local test_2_first = true
+local test_2_start_pressed = false
+function test_2()
+  if test_frame < 4 then
+    return
+  end
+
+  local test_case = "test_2: get/set round trip"
+  if test_2_first then
+    test_2_first = false
+
+    console.writeline(test_case)
+    console.writeline("Does joypad work normally?")
+    console.writeline("Press 'P1 Start' if it works good.")
+  end
+
+  if test_frame == 4 then
+    console.writeline(string.format("%s: running...", test_event))
+  end
+
+  -- round trip (no changes)
+  local t = joypad.get()
+  joypad.set(t)
+
+  if t["P1 Start"] then
+    test_2_start_pressed = true
+  else
+    if test_2_start_pressed then
+      test_2_start_pressed = false
+      next_test()
+    end
+  end
+end
+
+local test_3_first = true
+function test_3()
+  local test_case = "test_3: test if joypad.get() == movie.getinput(now)?"
+
+  if test_3_first then
+    test_3_first = false
+    console.writeline(test_case)
+  end
+
+  console.writeline(string.format("%s: test code is not available yet: SKIPPED", test_event))
+  next_test()
+end
+
+local tests = { test_1, test_2, test_3 }
+local events = { "event.onframestart", "event.onframeend", "emu.frameadvance" }
+
+local test_event_index = 1
+local test_function_index = 1
+test_event = events[1]
+test_function = tests[1]
+
+function test_reset()
+  test_frame = 0
+end
+test_reset()
+
+function next_test()
+  test_event_index = test_event_index + 1
+  if test_event_index > #events then
+    console.writeline("")
+    test_event_index = 1
+    test_function_index = test_function_index + 1
+    if test_function_index > #tests then
+      console.writeline("Test Finished.")
+      console.writeline("")
+      error("Done.")
+    end
+  end
+  test_event = events[test_event_index]
+  test_function = tests[test_function_index]
+  test_reset()
+end
+
+event.onframestart(function()
+  if test_event == "event.onframestart" then
+    test_function()
+    test_frame = test_frame + 1
+  end
+end)
+
+event.onframeend(function()
+  if test_event == "event.onframeend" then
+    test_function()
+    test_frame = test_frame + 1
+  end
+end)
+
+while true do
+  if test_event == "emu.frameadvance" then
+    test_function()
+    test_frame = test_frame + 1
+  end
+  emu.frameadvance()
+end