Exercise 102 shall be for testing

[chrboesch]

Testing in Zig is important and I would like to create an exercise for it. But the challenge is to extend our build system to include a test step that we can turn on with a new flag test_run.
I will open a PR with a simple test exercise, that we can to extend the build system.

[perillo]

The zig test command supports the Zig IPC; the advantage is that it will allow the use of custom colors in ZiglingStep.
See https://github.com/ziglang/zig/blob/3f3b1a6/lib/std/Build/Step/Run.zig#L936

The alternative is to just run zig test; the advantage is that we don't have to add additionally code.

[chrboesch]

the advantage is that we don't have to add additionally code

Sure, but it doesn't fit into the learning path, when you have to enter a different command instead of zig build.
Therefore I would like to extend our build system.

[ratfactor]

Would a stand-alone executable (#296) help or hurt this effort?

[chrboesch]

Would a stand-alone executable (#296) help or hurt this effort?

We need to start a process where we run e.g. zig test 102_testing.zig. So it should not be as difficult as creating a test step in the current build system. Rather easier.