Refactor classes (including tests) to resolve dependencies out of the IoC container with $this->dep = app($class::class) in the constructor, instead of through the constructor method arguments.
Constructor arg lists get quite long (see PopulationCalculator), and needs fixing test constructors whenever this changes.
Currently, we only have some integration tests (we test a bunch of modules together, with the goal of solving a challenge).
Adding unit tests, which test each component in isolation, can help us spot and fix bugs easier and faster. In particular, the arutil (utilities) module would be a good start.
This could be done by adding tests to pytest (the tests directory) or via [doctest](https://
Refactor classes (including tests) to resolve dependencies out of the IoC container with
$this->dep = app($class::class)in the constructor, instead of through the constructor method arguments.Constructor arg lists get quite long (see PopulationCalculator), and needs fixing test constructors whenever this changes.
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