Test.cs

[Fact]
public void ShouldCreatePurchaseOrderWithExpectedInformation()
{
    var purchaseOrderRepositorySpy = new PurchaseOrderRepositorySpy();
    
    var publisherDummy = new DummyPublisher();
    
    var useCase = new OpenPurchaseOrderUseCase(
        purchaseOrderRepositorySpy,
        publisherDummy);
        
    var purchaseOrderRequest = CreateValidPurchaseOrderRequest();
    
    var expectedPurchaseOrder = CreateFrom(purchaseOrderRequest);

    useCase.OpenNewPurchaseOrder(purchaseOrderRequest);
    
    purchaseOrderRepositorySpy.Items.Contains(expectedPurchaseOrder);
}