Todos los archivos de Api.Tests reemplazan la connection string hardcodeada
por TestConnectionStrings.ApiTestDb. Cada proyecto de tests ahora tiene su
propia base de datos aislada, eliminando la contención entre Application.Tests
y Api.Tests que causaba flakiness.
Follow-up of B1 (V010 migration). Issues found when running the full suite
cross-assembly:
1. Respawn 'Cannot delete rows from a temporal history table' error:
4 per-class Respawner configs in SIGCM2.Application.Tests did not
include the newly-created *_History tables introduced by V010
(Usuario_History / Rol_History / Permiso_History / RolPermiso_History).
The engine rejects direct DELETE on system-versioned history tables.
Extended TablesToIgnore in all 4 configs.
2. FK_RefreshToken_Usuario violation in RolRepositoryTests.InitializeAsync:
Manual 'DELETE FROM Usuario' failed when residual RefreshTokens from
prior suites existed. Added 'DELETE FROM RefreshToken' before the
Usuario cleanup to respect FK order. Latent bug surfaced by a new
test-run ordering — not UDT-010 specific, but fixed in scope.
3. UQ_Usuario_Username duplicate admin race:
TransactionScopeSpikeTests (B0) and V010MigrationTests (B1) were
missing [Collection("ApiIntegration")], causing them to run in
parallel with the rest of SIGCM2.Api.Tests and race on SeedAdmin.
Serialized by adding the Collection attribute.
Suite now passes cross-assembly: 130/130 Api.Tests + 336/336 Application.Tests.
Refs: sdd/udt-010-auditoria-trazabilidad/apply-progress (B1 follow-up)
Validates design decision #D-1 (TransactionScope ambient over IUnitOfWork):
TransactionScope with TransactionScopeAsyncFlowOption.Enabled does NOT
escalate to MSDTC when multiple SqlConnections share the same connection
string. Test passes (DistributedIdentifier == Guid.Empty).
Unblocks UDT-010 batches B1-B14.
Refs: sdd/udt-010-auditoria-trazabilidad/{design,tasks}
