Snapshot Testing

dotnet add package Verify.Xunit
# or for other test frameworks:
dotnet add package Verify.NUnit
dotnet add package Verify.MSTest

using System.Runtime.CompilerServices;

public static class ModuleInitializer
{
    [ModuleInitializer]
    public static void Init()
    {
        // Use source-file-relative paths for verified files
        VerifyBase.UseProjectRelativeDirectory("Snapshots");

        // Configure diff tool (optional - auto-detected)
        // DiffTools.UseOrder(DiffTool.Rider, DiffTool.VisualStudioCode);
    }
}

[Fact]
public Task VerifyUserDto()
{
    var user = new UserDto(
        Id: "user-123",
        Name: "John Doe",
        Email: "john@example.com",
        CreatedAt: new DateTime(2025, 1, 15));

    return Verify(user);
}

{
  Id: user-123,
  Name: John Doe,
  Email: john@example.com,
  CreatedAt: 2025-01-15T00:00:00
}

[Fact]
public async Task VerifyRenderedEmail()
{
    var html = await _emailRenderer.RenderAsync("Welcome", new { Name = "John" });

    // Use extension parameter for proper file naming
    await Verify(html, extension: "html");
}

[Fact]
public async Task UserSignupInvitation_RendersCorrectly()
{
    var renderer = _services.GetRequiredService<IMjmlTemplateRenderer>();

    var variables = new Dictionary<string, string>
    {
        { "OrganizationName", "Acme Corporation" },
        { "InviteeName", "John Doe" },
        { "InviterName", "Jane Admin" },
        { "InvitationLink", "https://example.com/invite/abc123" },
        { "ExpirationDate", "December 31, 2025" }
    };

    var html = await renderer.RenderTemplateAsync(
        "UserInvitations/UserSignupInvitation",
        variables);

    await Verify(html, extension: "html");
}

[Fact]
public Task ApprovePublicApi()
{
    var assembly = typeof(MyLibrary.PublicClass).Assembly;

    var publicApi = assembly.GetExportedTypes()
        .OrderBy(t => t.FullName)
        .Select(t => new
        {
            Type = t.FullName,
            Members = t.GetMembers(BindingFlags.Public | BindingFlags.Instance | BindingFlags.Static)
                .Where(m => m.DeclaringType == t)
                .OrderBy(m => m.Name)
                .Select(m => m.ToString())
        });

    return Verify(publicApi);
}

dotnet add package PublicApiGenerator
dotnet add package Verify.Xunit

[Fact]
public Task ApproveApi()
{
    var api = typeof(MyPublicClass).Assembly.GeneratePublicApi();
    return Verify(api);
}

[Fact]
public async Task GetUser_ReturnsExpectedResponse()
{
    var client = _factory.CreateClient();

    var response = await client.GetAsync("/api/users/123");

    // Verify status, headers, and body together
    await Verify(new
    {
        StatusCode = response.StatusCode,
        Headers = response.Headers
            .Where(h => h.Key.StartsWith("X-"))  // Custom headers only
            .ToDictionary(h => h.Key, h => h.Value.First()),
        Body = await response.Content.ReadAsStringAsync()
    });
}

[Fact]
public Task VerifyOrder()
{
    var order = new Order
    {
        Id = Guid.NewGuid(),  // Different every run
        CreatedAt = DateTime.UtcNow,  // Different every run
        Total = 99.99m
    };

    return Verify(order)
        .ScrubMember("Id")  // Replace with placeholder
        .ScrubMember("CreatedAt");
}

{
  Id: Guid_1,
  CreatedAt: DateTime_1,
  Total: 99.99
}