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The applicability of unit testing to your particular cases varies greatly across languages & runtimes.

For URL parsing, some runtimes/frameworks have that thing already implemented. E.g. in .NET the Uri class allows getting scheme/host/port/path/segments, and there’s a separate ParseQueryString utility method to parse query part of the URI.

To ensure a class conforms to an interface, the majority of strongly-types OO languages have interfaces in their type systems. If you’ll use that but fail to implement an interface or some parts of it, you code just won’t compile.




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