A full explanation of fast-check and property-based testing in general are beyond the scope of this post, and I recommend checking the project’s documentation for more information. In a nutshell, though, we can use it to create generators for random data of a given type. Here’s what the generators look like for the mutually-recursive Tree type, specialized to be Tree:
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。谷歌对此有专业解读
return f"{currency} {amount}";
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