Facing difficulties with the builder pattern

[restive gulch]

For a school excersise I need to Fix tests and code using the builder design pattern. However I am stuck and I don't know how to proceed. Specifically where and how I should Implement the builder.
Here is a link to the repository with the work I have so far, any help is appreciated

https://github.com/JuupStraathof/computerfactory

[daring turtle]

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[daring turtle]

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