Blog - Arrange, Act and Assert syntax for testing

with-aaa.cs

[TestMethod]
public void GetCustomerById()
{
  // Arrange
  const int CustomerId = 5;
  var repository = new CustomerRepository();

  // Act
  Customer customer = repository.GetCustomerById(CustomerId);

  // Assert
  Assert.AreEqual(CustomerId, customer);
}

with-aaa2.cs

[TestMethod]
public void ShouldGenerateCreditInvoiceDocumentWhenNegativeAmountNew()
{
  // Arrange
  ICustomerService customerService = MockRepository.GenerateStub<ICustomerService>();
  IDocumentService documentService = MockRepository.GenerateStub<IDocumentService>();
  double amount = -1000;
  Customer customer = new Customer() { Id = 12345, Name = "Name1" };
  customerService.Stub(stub => stub.GetCustomer(customer.Id)).Return(customer);
   InvoicingProcess invoicingProcess = new InvoicingProcess(customerService, documentService);

  // Act
   invoicingProcess.Invoice(customer.Id, amount);

  // Assert
  documentService.AssertWasCalled(stub => stub.CreateDocument(customer, DocumentType.CreditInvoice));
}

without-aaa.cs

[TestMethod]
public void GetCustomerById()
{
  // Arrange
  const int CustomerId = 5;
  var repository = new CustomerRepository();

  // Act & Assert
  Assert.AreEqual(CustomerId, repository.GetCustomerById(CustomerId));
}

Read full blog post at https://blog.hundeide.net/2009/02/arrange-act-and-assert-syntax-for-testing/