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ASPNET Integration Testing — Comprehensive Integration Tests in .NET

DodaTech Updated 2026-06-28 1 min read

In this tutorial, you'll learn about ASPNET Testing Integration. We cover key concepts, practical examples, and best practices to help you understand and apply this topic effectively.

Integration Testing in ASP.NET Core validates complete request-response cycles through the full middleware pipeline.

public class ScanApiIntegrationTests : IClassFixture<WebApplicationFactory<Program>>
{
    private readonly WebApplicationFactory<Program> _factory;
    public ScanApiIntegrationTests(WebApplicationFactory<Program> factory) => _factory = factory;

    [Fact]
    public async Task ScanEndpoint_ValidRequest_ReturnsOkWithResult()
    {
        var client = _factory.WithWebHostBuilder(builder =>
        {
            builder.ConfigureTestServices(services =>
            {
                services.RemoveAll<IScanService>();
                services.AddScoped<IScanService, MockScanService>();
            });
        }).CreateClient();

        var response = await client.PostAsJsonAsync("/api/scan", new ScanRequest
        {
            FileName = "test.pdf",
            FileContent = Convert.ToBase64String(new byte[100])
        });

        response.EnsureSuccessStatusCode();
        var result = await response.Content.ReadFromJsonAsync<ScanResponse>();
        Assert.NotNull(result);
        Assert.Equal("clean", result.Status);
    }
}

Integration tests catch configuration, middleware ordering, and dependency wiring issues that unit tests miss.

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