Testing javascript inside IIFE

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My team leader wants me to wrap my js code inside an IIFE immediatly-invoked function expression. I can't figure out how to spyOn my code now.

How would I spyOn the follow:

(function(){
function_1(){...}
function_2(){...}
});

spyOn(window,'function_1') doesn't work.

Passing window into the IIFE doesn't work.

Trying both (x=function()... and (function x() ... then spyOn(x,'function_1') doesn't work either.

I couldn't find anything online about this.

asked 56 secs ago

user29998

1