DUnitX Testing Patterns

DUnitX Testing Patterns — Skill

Use this skill when creating or organizing unit tests in Delphi projects.

When to Use

• When creating tests for new features
• When applying TDD (Test-Driven Development)
• When creating database integration tests
• When refactoring existing tests

Test Project Structure

tests/
├── MeuApp.Tests.dpr                 ← Projeto de testes
├── Domain/
│   ├── MeuApp.Tests.Customer.Entity.pas
│   └── MeuApp.Tests.Order.Entity.pas
├── Application/
│   ├── MeuApp.Tests.Customer.Service.pas
│   └── MeuApp.Tests.Order.Service.pas
├── Infrastructure/
│   └── MeuApp.Tests.Customer.Repository.pas
└── Helpers/
    ├── MeuApp.Tests.Helpers.Database.pas
    └── MeuApp.Tests.Helpers.Mocks.pas

Basic Test Fixture

unit MeuApp.Tests.Customer.Service;

interface

uses
  DUnitX.TestFramework,
  MeuApp.Domain.Customer.Entity,
  MeuApp.Domain.Customer.Repository.Intf,
  MeuApp.Application.Customer.Service;

type
  [TestFixture]
  TCustomerServiceTest = class
  private
    FService: TCustomerService;
    FMockRepo: ICustomerRepository;
  public
    [Setup]
    procedure Setup;

    [TearDown]
    procedure TearDown;

    [Test]
    procedure CreateCustomer_WithValidData_ShouldSucceed;

    [Test]
    procedure CreateCustomer_WithEmptyName_ShouldRaiseException;

    [Test]
    procedure CreateCustomer_WithDuplicateCpf_ShouldRaiseException;

    [Test]
    procedure GetById_WithExistingId_ShouldReturnCustomer;

    [Test]
    procedure GetById_WithInvalidId_ShouldRaiseNotFoundException;
  end;

implementation

uses
  System.SysUtils;

{ TCustomerServiceTest }

procedure TCustomerServiceTest.Setup;
begin
  FMockRepo := TMemoryCustomerRepository.Create;
  FService := TCustomerService.Create(FMockRepo);
end;

procedure TCustomerServiceTest.TearDown;
begin
  FService.Free;
  //FMockRepo is interface — released automatically
end;

[Test]
procedure TCustomerServiceTest.CreateCustomer_WithValidData_ShouldSucceed;
begin
  Assert.WillNotRaiseAny(
    procedure
    begin
      FService.CreateCustomer('João Silva', '12345678901', '[email protected]');
    end
  );
end;

[Test]
procedure TCustomerServiceTest.CreateCustomer_WithEmptyName_ShouldRaiseException;
begin
  Assert.WillRaise(
    procedure
    begin
      FService.CreateCustomer('', '12345678901', '[email protected]');
    end,
    EValidationException
  );
end;

[Test]
procedure TCustomerServiceTest.CreateCustomer_WithDuplicateCpf_ShouldRaiseException;
begin
  FService.CreateCustomer('João', '12345678901', '[email protected]');

  Assert.WillRaise(
    procedure
    begin
      FService.CreateCustomer('Maria', '12345678901', '[email protected]');
    end,
    EBusinessRuleException
  );
end;

[Test]
procedure TCustomerServiceTest.GetById_WithExistingId_ShouldReturnCustomer;
var
  LCustomer: TCustomer;
begin
  FService.CreateCustomer('João', '12345678901', '[email protected]');

  LCustomer := FService.GetById(1);
  try
    Assert.IsNotNull(LCustomer);
    Assert.AreEqual('João', LCustomer.Name);
  finally
    LCustomer.Free;
  end;
end;

[Test]
procedure TCustomerServiceTest.GetById_WithInvalidId_ShouldRaiseNotFoundException;
begin
  Assert.WillRaise(
    procedure
    begin
      FService.GetById(999);
    end,
    EEntityNotFoundException
  );
end;

initialization
  TDUnitX.RegisterTestFixture(TCustomerServiceTest);

end.