Inspired by J. B. Rainsberger
You can practice different things using this code base. For example…
We can’t write reasonable unit tests without refactorings first. But we don’t want to refactor without tests at all.
But we can test the application as a whole. Gain control over all external input sources (RNGs, system time, keyboard input and so on). Then save all outputs produced (console output, emails sent, files changed etc). This is our Golden Master.
Now we can change the code and compare if it still yields the same results as before.
This is another thing to try out. And probably it’s a good idea to not
learn this in production. Just use your IDE refactorings. Do not waste
time to understand the code. Trust your IDE and use features like
extract method or
invert if statement. You will be surprised about
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