The program input and output need some testing

[gonzalo-bulnes]

The main function needs some refactoring (for example: #4).
But refactoring requires being able to run some tests to ensure that the code behaviour hasn't changed.

I like to use dependency injection, and replacing STDIN, STDOUT by variables to test the output of my command line programs (example code, test).

I'm not sure how to achieve that in Rust yet, and would appreciate any suggestion!

[sebglazebrook]

So rust has a basic testing library built in. It works for most cases and depending on what you want to do it should suffice.

Mocking is intersting in Rust though, There are some libraries that help out in this case (https://github.com/kriomant/mockers) but they are no where near as helpful as say Rspec in Ruby. There is also a testing library that I've used before (don't remember the name but you can probably google it) that specifcally allows you to assert things related to STDOUT.

I would probably create my own mock objects that adhere to the traite required and then assert on that.

Does that make sense?

[gonzalo-bulnes]

[...] that specifcally allows you to assert things related to STDOUT.

💡 And yes, this does make sense, I'll take a look at how that library works.

[gonzalo-bulnes]

I haven't looked a this super closely, but the test example in the accepted answer to this question looks like what I was referring to in Golang.