As you formulated your question, there may be some confusion about what you ask. Therefore, let us first step back from this.
It looks like you are asking whether to include DUnit units in a production application . That would be a very bad idea, and I will avoid the details of why in this answer.
However, I realized that your question is whether you should treat this third-party source as your own source code for the project (from the point of view of source control). And I answered as such.
There are a number of principles that justify including a DUnit source in an SC repository.
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