Do you have experience creating and executing integration tests for software systems?

Yes, I have experience creating and executing integration tests in C#. Usually, I use frameworks such as NUnit or xUnit, along with mocking libraries (e.g., Moq) and tools for setting up the test environment (e.g., Docker or built-in test servers).

Integration tests verify the interaction of multiple system components, such as the controller working with the database and services. An example of a simple integration test using xUnit and Entity Framework Core InMemory:

public class UserServiceIntegrationTests
{
    private readonly UserService _userService;
    private readonly DbContextOptions<AppDbContext> _options;

    public UserServiceIntegrationTests()
    {
        _options = new DbContextOptionsBuilder<AppDbContext>()
            .UseInMemoryDatabase(databaseName: "TestDb")
            .Options;

        var context = new AppDbContext(_options);
        _userService = new UserService(context);
    }

    [Fact]
    public void AddUser_ShouldAddUserToDatabase()
    {
        var user = new User { Id = 1, Name = "Test User" };
        _userService.AddUser(user);

        using var context = new AppDbContext(_options);
        var addedUser = context.Users.Find(1);
        Assert.NotNull(addedUser);
        Assert.Equal("Test User", addedUser.Name);
    }
}

This test checks that the service interacts correctly with the database, which goes beyond unit testing and is close to real application operation.