Improve testing

[berezovskyi]

Kitchensink ticket for all things testing

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Basics

• https://learn.microsoft.com/en-us/dotnet/core/testing/unit-testing-best-practices
• Consider https://docs.shouldly.org/ or https://fluentassertions.com/introduction
• Reduce a need for mocking - but planning to use NSubstitute otherwise
• Make DotNetRdfHelper testable (and not a static class of helpers, essentially)
• Test order in CM tests - ? xUnit fixture or rethink the approach

Client

• WireMock, esp. for discovery code for the client

Server

• https://learn.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.mvc.testing.webapplicationfactory-1?view=aspnetcore-8.0 when we revisit OSLC Server support
• https://github.com/pact-foundation/pact-net - not sure if it can be adapted to contract test Linked Data APIs with the loss of ergonomics

Misc

• Mutation testing - https://stryker-mutator.io/docs/mutation-testing-elements/supported-mutators/ - I am not a big fan of it normally, but oslc4net is poorly tested and especially for important bits like DotNetRdfHelper it could be valuable to archive good mutation score based on covered code.