Testing.lua

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");
frame:RegisterEvent("UNIT_SPELLCAST_INTERRUPTED");
frame:RegisterEvent("UNIT_SPELLCAST_FAILED");
frame:RegisterEvent("UNIT_SPELLCAST_FAILED_QUIET");
frame:RegisterEvent("UNIT_SPELLCAST_STOP");
frame:RegisterEvent("UNIT_SPELLCAST_SENT");

Testing.toc

## Interface: 20400
## Title: Testing
## Author: Shiro
## Notes: Just testing.

Testing.lua