Tests: More unit tests

[maximilien-noal]

A lot of new code is not covered by unit tests. While it works since it's tested by try to make games run, it's harder without tests to detect regressions.

Also:
https://stryker-mutator.io/docs/stryker-net/introduction/
"Stryker.NET offers you mutation testing for your .NET Core and .NET Framework projects. It allows you to test your tests by temporarily inserting bugs. Stryker.NET is installed using NuGet."

This package could help a lot to ensure new unit tests are sharp enough.

[maximilien-noal]

https://plugins.jetbrains.com/plugin/20747-unittestbot-net could really help with this !

Automated unit test generation tool for .NET code.
Generating ready-to-use test cases with method bodies and inputs
Maximizing branch coverage in regression suite while keeping the number of tests at minimum
Capable to find deeply hidden code defects and express them as tests
Applicable to LINQ syntax and complex generics
Supporting .NET Framework, .NET Core, .NET 5, and .NET 6
Powered by V# — the custom symbolic execution engine

Sadly my version of Rider is too new ATM.

[maximilien-noal]

Also related: unit test for the CPU for all instructions beyond the 8086:

#228

[maximilien-noal]

For Code QA, maybe look into Jetbrains Qodana (github action) instead of GitHub's Code QL.

Also, once the coverage is good enough: https://github.com/simon-k/dotnet-code-coverage-badge

[maximilien-noal]

For integration tests, this may be worth it someday:

https://github.com/LightBDD/LightBDD

instead of SpecFlow.NET (which is slow)

[maximilien-noal]

For filesystem dependent parts: https://github.com/TestableIO/System.IO.Abstractions