[FEATURE] Add Integration Tests project with WireMock fixture

[guibranco]

Description

We need to add comprehensive integration tests for our C# integration library that interacts with an HTTP ERP (Sankhya) service. These tests should ensure that our integration library correctly handles various scenarios when communicating with the ERP service.

Problem Statement

• Current Issue: The current integration testing coverage for the HTTP ERP service is insufficient. We need to verify that the integration library works correctly with the ERP service and handles different scenarios, including error cases and edge cases.
• Impact: Without proper integration tests, there is a risk of undetected issues in how our library interacts with the ERP service, potentially leading to bugs and unreliable behavior in production.

Proposed Solution

• Develop Integration Tests:
  • Use XUnit for testing.
  • Employ WireMock to simulate HTTP responses from the ERP service.
  • Use Snapshooter for snapshot testing to compare actual responses against expected results.
  • Utilize NSubstitute for mocking dependencies where necessary.
  • Use Bogus to generate realistic fake data for testing.

Implementation Steps

1. Set Up Integration Tests:

   • Create a new test project if one does not already exist for integration tests.
   • Add dependencies for XUnit, WireMock, Snapshooter, NSubstitute, and Bogus.

   <ItemGroup>
     <PackageReference Include="xunit" Version="2.4.1" />
     <PackageReference Include="WireMock.Net" Version="3.1.0" />
     <PackageReference Include="Snapshooter" Version="1.0.0" />
     <PackageReference Include="NSubstitute" Version="4.2.2" />
     <PackageReference Include="Bogus" Version="33.1.0" />
   </ItemGroup>

2. Configure WireMock for Fake HTTP Requests:

   • Set up WireMock to simulate various HTTP responses from the ERP service. This will allow us to test how the integration library handles different scenarios.

   public class ErpServiceTests : IClassFixture<WireMockServerFixture>
   {
       private readonly WireMockServerFixture _fixture;
   
       public ErpServiceTests(WireMockServerFixture fixture)
       {
           _fixture = fixture;
       }
   
       [Fact]
       public async Task ShouldHandleSuccessfulResponse()
       {
           // Arrange
           _fixture.Server
               .Given(Request.Create().WithPath("/api/orders").UsingGet())
               .RespondWith(Response.Create().WithStatusCode(200).WithBody("{ \"orderId\": \"12345\" }"));
   
           // Act
           var result = await _service.GetOrderAsync("12345");
   
           // Assert
           Assert.Equal("12345", result.OrderId);
       }
   }

3. Use Snapshooter for Response Comparison:

   • Implement Snapshooter to take snapshots of responses and compare them with expected results. This will help ensure consistency in the responses.

   [Fact]
   public async Task ShouldMatchExpectedResponse()
   {
       // Arrange
       var expectedResponse = new { OrderId = "12345" };
   
       // Act
       var actualResponse = await _service.GetOrderAsync("12345");
   
       // Assert
       actualResponse.Should().MatchSnapshot();
   }

4. Generate Fake Data with Bogus:

   • Use Bogus to create realistic fake data for various tests, such as generating order details, customer information, etc.

   public class OrderGenerator
   {
       public static Order CreateFakeOrder()
       {
           var faker = new Faker<Order>()
               .RuleFor(o => o.OrderId, f => f.Random.Guid().ToString())
               .RuleFor(o => o.CustomerName, f => f.Name.FullName())
               .RuleFor(o => o.Amount, f => f.Finance.Amount());
   
           return faker.Generate();
       }
   }

5. Mock Dependencies with NSubstitute:

   • Use NSubstitute to mock any dependencies that are not directly related to the ERP service interactions but are necessary for testing.

   public class OrderServiceTests
   {
       private readonly IOrderRepository _orderRepository;
       private readonly OrderService _orderService;
   
       public OrderServiceTests()
       {
           _orderRepository = Substitute.For<IOrderRepository>();
           _orderService = new OrderService(_orderRepository);
       }
   
       [Fact]
       public async Task ShouldReturnOrder()
       {
           // Arrange
           var fakeOrder = OrderGenerator.CreateFakeOrder();
           _orderRepository.GetOrderAsync(Arg.Any<string>()).Returns(Task.FromResult(fakeOrder));
   
           // Act
           var result = await _orderService.GetOrderAsync(fakeOrder.OrderId);
   
           // Assert
           Assert.Equal(fakeOrder.OrderId, result.OrderId);
       }
   }

6. Run and Validate Tests:

   • Execute all integration tests to ensure that they cover the necessary scenarios and pass successfully.
   • Review and refine tests based on results and feedback.

Additional Notes

• Ensure that the integration tests are comprehensive and cover a wide range of scenarios, including success and failure cases.
• Collaborate with the development team to identify any additional test cases or scenarios that should be included.

[gitauto-ai]

Hey, I'm a bit lost here! Not sure which file I should be fixing. Could you give me a bit more to go on? Maybe add some details to the issue or drop a comment with some extra hints? Thanks!

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