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foreign [Music] this week I came across a video where I met twin and James Shore pair on introducing nullable infrastructure wrappers in an existing code base [Music] it provided some insights into the pattern and I was inspired to practice it more I present to you a session where I write a tiny application using this pattern and show my current understanding of it so I have the reference article here on the left we can have a look at some of the patterns here maybe and here on the right hand side there is the code on the bottom here Im going to run the tests and at the moment this is the only thing weve got just a single python file with some setup to run tests so I can write a test like this sample and well see the failure down there it doesnt exist expects five but it got nothing so we can add like that and it passes so thats thats the setup were working with here so the application I want to write is something that will change the background on my desktop so lets start out
