[Vuejs]-How do I mock a module that is minified?

So you are trying to write unit test for a 3rd party library? This kind of goes against the idea of unit testing your code since you at some point have to assume the other code has its own unit test already. I understand you mocking the 3rd party code so you can get yours to run, but a mock should not care about how the code works, and instead just provides the needed output so your actual code can run.

I would suggest stubbing the code or just returning a known testable value so you can at minimum unit test your code, and not worry about the inner workings of the opinionlab.min.js , as the value gained from trying to parse through a minified fiel will not be worth the time.