public class ProductControllerTests : IClassFixture<CustomWebApplicationFactory<Program>>
{
    private readonly HttpClient _client;

    public ProductControllerTests(CustomWebApplicationFactory<Program> factory)
    {
        _client = factory.CreateClient();
    }

    [Fact]
    public async Task GetProduct_ReturnsOk_WhenProductExists()
    {
        // Arrange
        var response = await _client.GetAsync("/api/products/1");

        // Assert
        response.EnsureSuccessStatusCode();
        var content = await response.Content.ReadAsStringAsync();
        Assert.Contains("Laptop", content);
    }
}