TDD

Resources

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

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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