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public interface IDataProvider
{
    IEnumerable<Product> GetProducts();
}

public class ProductService
{
    private readonly IDataProvider _dataProvider;

    public ProductService(IDataProvider dataProvider)
    {
        _dataProvider = dataProvider;
    }

    public IEnumerable<Product> GetAll()
    {
        return _dataProvider.GetProducts();
    }
}

[Fact]
public void GetAll_ReturnsProducts_WhenDataProviderSucceeds()

[Fact]
public void GetAll_ReturnsProducts_WhenDataProviderSucceeds()
{
    // Arrange
    var mockDataProvider = new Mock<IDataProvider>();
    mockDataProvider.Setup(dp => dp.GetProducts()).Returns(new List<Product> { new Product() });
    var service = new ProductService(mockDataProvider.Object);

    // Act
    var result = service.GetAll();

    // Assert
    Assert.NotEmpty(result);
}

public Product GetById(int id)
{
    return _dataProvider.GetProducts().FirstOrDefault(p => p.Id == id);
}

[Fact]
public void GetById_ReturnsProduct_WhenIdExists()
{
    // Arrange
    var mockDataProvider = new Mock<IDataProvider>();
    mockDataProvider.Setup(dp => dp.GetProducts()).Returns(new List<Product> { new Product { Id = 1 } });
    var service = new ProductService(mockDataProvider.Object);

    // Act
    var result = service.GetById(1);

    // Assert
    Assert.NotNull(result);
    Assert.Equal(1, result.Id);
}

[Fact]
public void GetAll_ThrowsException_WhenDataProviderFails()
{
    // Arrange
    var mockDataProvider = new Mock<IDataProvider>();
    mockDataProvider.Setup(dp => dp.GetProducts()).Throws<Exception>();
    var service = new ProductService(mockDataProvider.Object);

    // Act & Assert
    Assert.Throws<Exception>(() => service.GetAll());
}

[Fact]
public void GetById_ReturnsNull_WhenIdDoesNotExist()
{
    // Arrange
    var mockDataProvider = new Mock<IDataProvider>();
    mockDataProvider.Setup(dp => dp.GetProducts()).Returns(new List<Product>());
    var service = new ProductService(mockDataProvider.Object);

    // Act
    var result = service.GetById(999);

    // Assert
    Assert.Null(result);
}