Verify is a snapshot tool that simplifies the assertion of complex data models and documents.

Verify is called on the test result during the assertion phase. It serializes that result and stores it in a file that matches the test name. On the next test execution, the result is again serialized and compared to the existing file. The test will fail if the two snapshots do not match: either the change is unexpected, or the reference snapshot needs to be updated to the new result.

• https://nuget.org/packages/Verify.Xunit/
• https://nuget.org/packages/Verify.NUnit/
• https://nuget.org/packages/Verify.Expecto/
• https://nuget.org/packages/Verify.MSTest/

Accepting or declining a snapshot file is part of the core workflow of Verify. There are several ways to do this and the approach(s) selected is a personal preference.

• In the Windows Tray via DiffEngineTray
• ReSharper test runner support (Source)
• Rider test runner support (Source)
• Via the clipboard.
• Manually making the change in the launched diff tool. Either with a copy paste, or some tools have commands to automate this via a shortcut or a button.
• Manually on the file system. By renaming the .received. file to .verified.. This can be automated via a scripted to bulk accept all (by matching a pattern) .received. files.

All examples use ImplicitUsings. Ensure the following is set to have examples compile correctly <ImplicitUsings>enable</ImplicitUsings>

If ImplicitUsings are not enabled, substitute usages of Verify() with Verifier.Verify().

Given a class to be tested:

public static class ClassBeingTested
{
    public static Person FindPerson() =>
        new()
        {
            Id = new("ebced679-45d3-4653-8791-3d969c4a986c"),
            Title = Title.Mr,
            GivenNames = "John",
            FamilyName = "Smith",
            Spouse = "Jill",
            Children = new()
            {
                "Sam",
                "Mary"
            },
            Address = new()
            {
                Street = "4 Puddle Lane",
                Country = "USA"
            }
        };
}

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Support for xUnit

[UsesVerify]
public class Sample
{
    [Fact]
    public Task Test()
    {
        var person = ClassBeingTested.FindPerson();
        return Verify(person);
    }
}

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• Verify Xunit Intro

Support for NUnit

[TestFixture]
public class Sample
{
    [Test]
    public Task Test()
    {
        var person = ClassBeingTested.FindPerson();
        return Verify(person);
    }
}

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Support for Expecto

open Expecto
open VerifyTests
open VerifyExpecto

[<Tests>]
let tests =
    testTask "findPerson" {
        let person = ClassBeingTested.FindPerson()
        do! Verifier.Verify("findPerson", person)
    }

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Due to the nature of the Expecto implementation, the following APIs in Verify are not supported.

• settings.UseTypeName()
• settings.UseMethodName()
• settings.UseParameters()
• settings.UseTextForParameters()

Instead use a custom name parameter.

Support for MSTest

[TestClass]
public class Sample :
    VerifyBase
{
    [TestMethod]
    public Task Test()
    {
        var person = ClassBeingTested.FindPerson();
        return Verify(person);
    }
}

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No existing .verified. file.

graph LR
run(Run test and<br/>create Received file)
failTest(Fail Test<br/>and show Diff)
closeDiff(Close Diff)
run-->failTest
shouldAccept{Accept ?}
failTest-->shouldAccept
accept(Move Received<br/>to Verified)
shouldAccept-- Yes -->accept
discard(Discard<br/>Received)
shouldAccept-- No -->discard
accept-->closeDiff
discard-->closeDiff

When the test is initially run will fail. If a Diff Tool is detected it will display the diff.

To verify the result:

• Execute the command from the Clipboard, or
• Accept with DiffEngineTray tool,
• Accept with ReSharper Addin or Rider Addin
• Use the diff tool to accept the changes, or
• Manually copy the text to the new file

This will result in the Sample.Test.verified.txt being created:

{
  GivenNames: John,
  FamilyName: Smith,
  Spouse: Jill,
  Address: {
    Street: 4 Puddle Lane,
    Country: USA
  },
  Children: [
    Sam,
    Mary
  ],
  Id: Guid_1
}

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Existing .verified. file.

graph LR
run(Run test and<br/>create Received file)
closeDiff(Close Diff)
failTest(Fail Test<br/>and show Diff)
run-->isSame
shouldAccept{Accept ?}
failTest-->shouldAccept
accept(Move Received<br/>to Verified)
shouldAccept-- Yes -->accept
discard(Discard<br/>Received)
shouldAccept-- No -->discard

isSame{Compare<br/>Verified +<br/>Received}
passTest(Pass Test and<br/>discard Received)
isSame-- Same --> passTest
isSame-- Different --> failTest
accept-->closeDiff
discard-->closeDiff

If the implementation of ClassBeingTested changes:

public static class ClassBeingTested
{
    public static Person FindPerson() =>
        new()
        {
            Id = new("ebced679-45d3-4653-8791-3d969c4a986c"),
            Title = Title.Mr,
            // Middle name added
            GivenNames = "John James",
            FamilyName = "Smith",
            Spouse = "Jill",
            Children = new()
            {
                "Sam",
                "Mary"
            },
            Address = new()
            {
                // Address changed
                Street = "64 Barnett Street",
                Country = "USA"
            }
        };
}

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And the test is re run it will fail.

The same approach can be used to verify the results and the change to Sample.Test.verified.txt is committed to source control along with the change to ClassBeingTested.

VerifyJson performs the following actions

• Convert to JToken (if necessary).
• Apply ignore member by name for keys.
• PrettyPrint the resulting text.

[Fact]
public Task VerifyJsonString()
{
    var json = "{'key': {'msg': 'No action taken'}}";
    return VerifyJson(json);
}

[Fact]
public Task VerifyJsonStream()
{
    var json = "{'key': {'msg': 'No action taken'}}";
    var stream = new MemoryStream(Encoding.UTF8.GetBytes(json));
    return VerifyJson(stream);
}

[Fact]
public Task StreamMember()
{
    var stream = new MemoryStream(Encoding.UTF8.GetBytes("value"));
    return Verify(new{stream});
}

[Fact]
public Task VerifyJsonJToken()
{
    var json = "{'key': {'msg': 'No action taken'}}";
    var target = JToken.Parse(json);
    return VerifyJson(target);
}

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Results in:

{
  key: {
    msg: No action taken
  }
}

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• All *.verified.* files should be committed to source control.
• All *.received.* files should be excluded from source control.

Most settings are available at the both global level and at the instance level.

When modifying settings at the both global level it should be done using a Module Initializer:

[UsesVerify]
public class StaticSettings
{
    [Fact]
    public Task Test() =>
        Verify("String to verify");
}

public static class StaticSettingsUsage
{
    [ModuleInitializer]
    public static void Initialize() =>
        VerifierSettings.AddScrubber(_ => _.Replace("String to verify", "new value"));
}

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In some scenarios it can be helpful to get access to the resulting *.verified.* files after a successful run. For example to do an explicit check for contains or not-contains in the resulting text. To allow this all Verify methods return a VerifyResult.

var result = await Verify(
    new
    {
        Property = "Value To Check"
    });
Assert.Contains("Value To Check", result.Text);

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If using Verifier.Throws, the resulting Exception will also be accessible

var result = await Verifier.Throws(MethodThatThrows);
Assert.NotNull(result.Exception);

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Utility for finding paths based on the current file.

using IOPath = System.IO.Path;

namespace VerifyTests;

public static class CurrentFile
{
    public static string Path([CallerFilePath] string file = "") =>
        file;

    public static string Directory([CallerFilePath] string file = "") =>
        IOPath.GetDirectoryName(file)!;

    public static string Relative(string relative, [CallerFilePath] string file = "")
    {
        var directory = IOPath.GetDirectoryName(file)!;
        return IOPath.Combine(directory, relative);
    }
}

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Verify follows Semantic Versioning. The same applies for extensions to Verify. Small changes in the resulting snapshot files may be deployed in a minor version. As such nuget updates to Verify.* should be done as follows:

• Updates all Verify.*packages in isolation
• Re-run all tests.
• If there are changes, ensure they look correct given the release notes. If the changes do not look correct, raise an issue.
• Accept those changes.

Snapshot changes do not trigger a major version change to avoid causing Diamond dependency issues for downstream extensions.

• Testing C# code reliably by freezing it in time - Nick Chapsas (1 August 2022)
• Snapshot Testing in .NET with Verify - Dan Clarke (21 July 2022)
• Testing an incremental generator with snapshot testing (14 Dec 2021)
• Snapshot Testing with Verify - Dan Clarke (10 Dec 2021)
• OSS Power-Ups: Verify (14 Jul 2021)
• Unhandled Exception podcast: Snapshot Testing (26 Nov 2021)
• 5 helpful Nuget package for Unit Testing in .NET (16 Oct 2021)
• 5 open source .NET projects that deserve more attention (9 Sep 2021)
• Verify Xunit Intro (26 Apr 2020)

• Verify.AngleSharp: Html verification utilities via AngleSharp.
• Verify.AspNetCore: Verification of AspNetCore bits.
• Verify.Aspose: Verification of documents (pdf, docx, xslx, and pptx) via Aspose.
• Verify.Blazor: Verification of Blazor Component via bunit or via raw Blazor rendering.
• Verify.Cosmos: Verification of Azure CosmosDB.
• Verify.DiffPlex: Comparison of text via DiffPlex.
• Verify.DocNet: Verification of pdfs via DocNet.
• Verify.EntityFramework: Verification of EntityFramework bits.
• Verify.FakeItEasy: Verification of FakeItEasy bits.
• Verify.HeadlessBrowsers: Verification of Web UIs using Playwright, Puppeteer Sharp, or Selenium.
• Verify.Http: Verification of Http bits.
• Verify.ICSharpCode.Decompiler: Comparison of assemblies and types via ICSharpCode.Decompiler.
• Verify.ImageHash: Comparison of images via ImageHash.
• Verify.ImageSharp.Compare: Verification and comparison of images via Codeuctivity.ImageSharp.Compare.
• Verify.ImageMagick: Verification and comparison of images via Magick.NET.
• Verify.ImageSharp: Verification of images via ImageSharp.
• Verify.MassTransit: Support for MassTransit test helpers.
• Verify.MicrosoftLogging: Verify MicrosoftLogging.
• Verify.MongoDB: Verification of MongoDB bits.
• Verify.Moq: Verification of Moq bits.
• Verify.NodaTime: Support for NodaTime.
• Verify.NServiceBus: Verify NServiceBus Test Contexts.
• Verify.NSubstitute: Support for NSubstitute types
• Verify.PdfPig: Verification of pdfs via PdfPig.
• Verify.Phash: Comparison of images via Phash.
• Verify.Quibble: Comparison of objects via Quibble.
• Verify.QuestPDF: Verification of QuestPDF documents.
• Verify.RavenDb: Verification of RavenDb bits.
• Verify.SqlServer: Verification of SqlServer bits.
• Verify.SourceGenerators: Verification of C# Source Generators.
• Verify.WinForms: Verification of WinForms UIs.
• Verify.Xamarin: Verification of Xamarin UIs.
• Verify.Xaml: Verification of Xaml UIs.
• Spectre.Verify.Extensions: Add an attribute driven file naming convention to Verify.
• Verify.Syncfusion: Verification of documents (pdf, docx, xslx, and pptx) via Syncfusion File Formats.

• Clipboard
• Compared to assertions
• Verify options
• Serializer Settings
• File naming
• Parameterised tests
• Named Tuples
• Scrubbers
• Diff Engine
• Diff Tools
• Diff Tool Order
• Custom Diff Tool
• Using anonymous types
• Verifying binary data
• Build server
• Comparers
• Converters
• FSharp Usage
• Compared to ApprovalTests

Helmet designed by Leonidas Ikonomou from The Noun Project.