scaffold-unit-tests

Mock all constructor-injected dependencies such as the Unit of Work and repositories with Moq, then test the happy path, validation failures, and error cases. Use FluentAssertions for result checks and mock.Verify to confirm calls like CommitTransactionAsync.

IQueryable cannot be mocked directly with Moq because it needs a query provider for operations like Where and ToListAsync. Use the MockQueryable.Moq package and call .BuildMock() on an in-memory list to create a valid mock queryable.

Cover the happy path returning success, duplicate or validation failures returning errors, and database exceptions triggering transaction rollback. Verify repository calls with Times.Once or Times.Never and confirm RollbackTransactionAsync runs on errors.

Yes, the generated tests target xUnit with Fact and Theory attributes and use FluentAssertions for readable assertions like result.IsSuccess.Should().BeTrue(). The test project also requires Moq and MockQueryable.Moq packages.

Returning a plain List or a raw AsQueryable() from the mock often fails when the handler calls async LINQ operators. Wrap the data with data.AsQueryable().BuildMock() from MockQueryable.Moq so the in-memory queryable supports the required provider behavior.