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authorDaniel Mueller <deso@posteo.net>2019-01-05 21:41:22 -0800
committerDaniel Mueller <deso@posteo.net>2019-01-05 21:41:22 -0800
commit6d07a0c9d9a9b39247a9727dea2d90eba4e1fe9e (patch)
tree843fb189a543e6bc95ff9e5498f5ca2d09bc67a0 /rand/rand_core/LICENSE-APACHE
parentb750c4b13272908a51b85072008554c344b25016 (diff)
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Supply customizable stdio channels to argparse
In order to properly test the program we need to have a way to intercept data printed to the stdio channels. There are different ways to accomplish that task. While it is reasonably easy to just start the program as a dedicated process doing so properly may be problematic from inside a test because either the path to the binary has to be retrieved or cargo -- the entity which knows the path -- be invoked. None of these approaches is very appealing from a testing and code complexity point of view: an additional fork means additional sources of errors and flakiness, executing cargo has the potential to even cause rebuilds of parts of the program, and while we are already testing against a slow I/O device this additional code running is unlikely to go unnoticed in the long-term. Lastly, doing so also means that we leave Rust's type safety behind when dealing with errors that could be nicely match'ed on when the test invocation is just a function call. To avoid all this complexity we instead strive for basically just running the main function. This patch marks a first step towards achieving this goal. It introduces the infrastructure to supply custom Write objects to the argument parsing functionality. Once more we piggy-back on the command execution context and add objects representing stdout and stderr to it. We further ensure that this context is passed to the argument parser invocations.
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