tdd.md

TDD

Resources

• 2010, Freeman & Pryce, Growing Object-Oriented Software, Guided by Tests
  • 
  • amazon
• 2002, Test Driven Development By Example, Kent Beck, Three Rivers Institute
  • 
• mocking with moq
  • samples
  • slides

Properties of a good unit test

properties of a	good unit test
atomic	should target a small piece of functionality, hard to maintain otherwise
deterministic	pass or fail, never inconclusive
repeatable	consistent with dependent objects changing, time passing and between runs
order independent & isolated	should not run be forced to run in a specific order, other tests or dependencies should not prevent test passing
fast	order of ms
easy to setup	should not be cumbersome

Pages

• NUnit
• xunit
• FluentAssertions docs
• Integration testing in ASP.NET Core with Microsoft.AspNetCore.TestHost
• EF in memory providers

  • DbSetExtensionMethods

  • InMemoryProviders

  • EFCore in memory provider. The InMemory provider is missing from EF though.

  • How to mock a db context / set?

    var mediatorHandler = Substitute.For<IMediatorHandler>();
    MyContext context = Substitute.For<MyContext>(mediatorHandler);
    var stubbedEntities = new List<TEntityIAmInterestedIn> { /* do populate here */ };
    var set = Substitute.For<
      DbSet<TEntityIAmInterestedIn>,
      IQueryable<TEntityIAmInterestedIn>,
      IDbAsyncEnumerable<TEntityIAmInterestedIn>>()
      .Initialize(stubbedEntities.AsQueryable());
    context.Set<TEntityIAmInterestedIn>().Returns(set);
    // further on, you might test your EF repository queries using your custom configured data stubs.

dotnet

• coverage

  • VS 2017 free coverage

  • vs 2017 integrated coverage

  • OpenCover

    # run tests for framework and platform
    dotnet test --no-build -v diag -o ./bin/x86/Release/
    dotnet test --framework netcoreapp1.1 --runtime win10-x86
    # new test project with enable pack
    dotnet new xunit -p -lang c#
    # list available project types
    dotnet new -all
    # An open source code coverage tool (branch and sequence point) for all .NET Frameworks 2 and above (including Silverlight). 
    # Also capable of handling 32 and 64 bit processes. Use ReportGenerator 1.9 for best viewing results (also available via Nuget).
    dotnet add package OpenCover --version 4.6.519

  • Integration Testing for ASP.NET Core Applications Feb18

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