ccshiro

function handler(this, event, ...)
    DEFAULT_CHAT_FRAME:AddMessage(event);
end

local frame = CreateFrame("Frame", "LeTestingAddon");
frame:SetScript("OnEvent", handler);

frame:RegisterEvent("UNIT_SPELLCAST_START");
frame:RegisterEvent("UNIT_SPELLCAST_SUCCEEDED");
frame:RegisterEvent("UNIT_SPELLCAST_DELAYED");