PagingInfo and PagedList
- TotalPages calculation
- ToggleSort, IsSortedBy, IsDescending
- pagination behavior and page bounds
SieveModelExtensions
- normalization of page, pageSize, and default sort
- extracting filter values for @=*, @=, and ==
controller guards and redirects
- People without countries
- Registrations without events, sports, or people
- verify that the correct RedirectToActionResult is returned and the expected toast is stored in TempData
controller result and view model checks
- verify whether an action returns the correct ViewResult, PartialViewResult, NotFoundResult, BadRequestResult, or ContentResult
- verify that an action returns the expected view model type and expected values inside the view model
validation and mapping logic from controllers
- CountriesController translations json <-> view model
- duplicate language validation and empty translation row handling
small helpers and formatting logic
- toast payload helpers if they are extracted later
- route/pager helper logic that can be tested without a full MVC host

Events.Tests.IntegrationTests

HTTP tests against the MVC application through WebApplicationFactory
- GET requests for screens return 200
- HTMX requests return the correct partial
redirect and guard scenarios
- People without countries redirects to Countries
- Registrations without events/sports/people redirects to the correct screen
CRUD happy paths for main screens
- create/edit/delete for Sports, Events, Countries, and People
- create/edit/delete for Registrations for the selected event
validation and error flow
- invalid input returns a partial with validation messages
- DB conflicts return readable ProblemDetails
filtering, sorting, and paging
- Sieve query strings return expected results
- transcription and country filtering for registrations

For these tests, the best setup is a dedicated PostgreSQL test container or an isolated test database with seeded data.

Events.Tests.UITests

end-to-end user flows in the browser
- open a screen, use the collapse form, save a record, see a toast
- paging and sorting without duplicating layout
- HTMX inline edit and cancel
Registrations screen
- changing the event refreshes the table
- person autocomplete works and respects the country filter
- create/edit/delete registration
navigation smoke tests
- all main links work
- redirect messages through toast are displayed

For UI tests, Playwright is the most natural choice, with a small smoke suite and a few critical end-to-end flows.

Suggested local setup:

dotnet tool install --global Microsoft.Playwright.CLI

Then inside the UI test project:

playwright install