Test .NET 10 APIs with WebApplicationFactory and Testcontainers MsSql.
npx skills add https://github.com/s205109/AHKFlowApp --skill cck-testing
Please help me install this Agent Skill. Skill: cck-testing Source: https://github.com/s205109/AHKFlowApp/tree/main/.claude/skills/cck-testing Command: npx skills add https://github.com/s205109/AHKFlowApp --skill cck-testing
Ensures tests for .NET 10 applications are reliable and meaningful by avoiding in-memory databases and exercising the full stack (routing, validation, MediatR pipelines, EF Core persistence), preventing false positives and brittle assumptions about database behavior.
Run an integration test with WebApplicationFactory configured to use a Testcontainers MsSql instance and assert that POST /api/v1/hotstrings returns 201 for a valid create request.
High-intent search queries and answers about installing and using this skill.
Configure WebApplicationFactory to use a Testcontainers MsSqlContainer instance, allowing integration tests to exercise routing, model binding, and EF Core migrations against a real SQL Server database. Reuse IClassFixture and IAsyncLifetime patterns to avoid repeated container startup for test collections.
Using Testcontainers MsSql instead of an in-memory database prevents false positives and brittle assumptions by validating real SQL Server behavior, including transactions, constraints, and EF Core migration behaviors, ensuring tests are reliable and meaningful.
Yes, you can test MediatR handlers against a real AppDbContext to validate persistence behaviors. Validators should be kept isolated for fast feedback, while FluentAssertions and Ardalis.Result checks assert outcomes using the AAA test pattern.
Structure .NET unit tests using the AAA test pattern with clear naming conventions. Apply FluentAssertions for expressive assertions, use NSubstitute for doubles when necessary, and validate Ardalis.Result outcomes to ensure comprehensive coverage.
Yes, this testing strategy applies to Blazor component tests as well as API endpoint validation. It exercises the full stack including MediatR pipelines and EF Core persistence, ensuring comprehensive validation across WebApplicationFactory integration tests.
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