[LudiusMaximus]

I think this is the best way to go:

testButton:SetScript("OnClick", function()
    
    if InCombatLockdown() then
    
      -- If you are using an addon that has removed WorldMapFrame from UIPanelWindows,
      -- we are able to hide WorldMapFrame for you here.
      -- If not, hiding the map will result in ToggleGameMenu() not working any more,
      -- because WorldMapFrame will still be listed in UIParent's FramePositionDelegate.
      if not UIPanelWindows["WorldMapFrame"] then
        WorldMapFrame:Hide()
      end
      
    else
      HideUIPanel(WorldMapFrame)
    end
  end)