Help with simple code

[Sythical]

Hey, I've just started learning Lua and tried to make a simple addon for my rogue, but it didn't work. I tried debugging and I think the problem is in this part of the code:

local EventFrame = CreateFrame("Frame")
 
EventFrame:RegisterEvent("COMBAT_LOG_EVENT_UNFILTERED");
EventFrame:SetScript("OnEvent", test_function);
 
function test_function(self, event, ...)
    ChatFrame1:AddMessage("COMBAT_LOG_EVENT_UNFILTERED");
end

What I expect this code to do is spam my chat box for each COMBAT_LOG_EVENT_UNFILTERED event it detects, but nothing happens. I can't understand what I'm doing wrong and will greatly appreciate any assistance. Thank you!

[Rilgamon]

Code is "read" from top to bottom.
So at line 4 you set 'nil'. Move your function up or the setscript down.
And make it local

[Talyrius]

local EventFrame = CreateFrame("Frame")
 
local function test_function(self, event, ...)
    ChatFrame1:AddMessage("COMBAT_LOG_EVENT_UNFILTERED")
end
 
EventFrame:RegisterEvent("COMBAT_LOG_EVENT_UNFILTERED")
EventFrame:SetScript("OnEvent", test_function)

Have you tried defining the function before you try to reference it?

EDIT: Rilgamon beat me to it.

[Sythical]

Thank you both, that helped