What problem does it solve? Writing integration tests that exercise the full handler-to-database stack is tedious and error-prone: you need a real database, migrations, seed data, and a DI container wired with real repositories. This Skill provides a complete, repeatable pattern for building such tests for ERP modules without mocking the data layer. ## Core Features & Use Cases - Module Fixture Pattern: Creates an IAsyncLifetime fixture that spins up a unique SQL Server LocalDB database, runs DbUp migrations (DDL journaled, stored procedures always-run), seeds test data, and builds a real DI container with MediatR, FluentValidation, and pipeline behaviors. - Test Class Templates: Provides IClassFixture and ICollectionFixture test class patterns covering happy paths, duplicate detection, and validation errors, with assertions verified directly against the database. - Use Case: When you add a new CreateInvoice command handler backed by a stored procedure, use this Skill to generate an integration test that sends the command through MediatR and verifies the invoice row, status, and totals in a real LocalDB database. ## Quick Start Generate integration tests for the Finance module's invoice handlers using a LocalDB fixture with DbUp migrations and seed data.
