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‎readme.md‎

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# <img src="/src/icon.png" height="30px"> Verify.EmailPreviewServices
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[![Discussions](https://img.shields.io/badge/Verify-Discussions-yellow?svg=true&label=)](https://github.com/orgs/VerifyTests/discussions)
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[![Build status](https://ci.appveyor.com/api/projects/status/soell7l73pbakm8u?svg=true)](https://ci.appveyor.com/project/SimonCropp/Verify-Ulid)
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[![Build status](https://ci.appveyor.com/api/projects/status/nwvywmfs2xb4tpsd?svg=true)](https://ci.appveyor.com/project/SimonCropp/Verify-Ulid)
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[![NuGet Status](https://img.shields.io/nuget/v/Verify.EmailPreviewServices.svg)](https://www.nuget.org/packages/Verify.EmailPreviewServices/)
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Extends [Verify](https://github.com/VerifyTests/Verify) to enable snapshotting of emails via [EmailPreviewDervices](https://emailpreviewservices.com).<!-- singleLineInclude: intro. path: /docs/intro.include.md -->

‎src/Directory.Build.props‎

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<Project>
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<PropertyGroup>
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<NoWarn>CS1591;CS0649;NU1608;NU1109</NoWarn>
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<Version>1.0.0</Version>
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<AssemblyVersion>1.0.0</AssemblyVersion>
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<Version>0.1.0</Version>
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<AssemblyVersion>0.1.0</AssemblyVersion>
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<LangVersion>preview</LangVersion>
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<PackageTags>Ulid, Verify</PackageTags>
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<Description>Extends Verify (https://github.com/VerifyTests/Verify) to enable scrubbing of Universally Unique Lexicographically Sortable Identifiers via Ulid (https://github.com/Cysharp/Ulid).</Description>
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<PackageTags>Email, Preview, Verify</PackageTags>
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<Description>Extends Verify (https://github.com/VerifyTests/Verify) to enable snapshotting of emails via Email Preview Services (https://emailpreviewservices.com).</Description>
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<ResolveAssemblyReferencesSilent>true</ResolveAssemblyReferencesSilent>
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<TreatWarningsAsErrors>true</TreatWarningsAsErrors>
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<EnforceCodeStyleInBuild>true</EnforceCodeStyleInBuild>

‎src/Directory.Packages.props‎

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<PackageVersion Include="SixLabors.ImageSharp" Version="3.1.12" />
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<PackageVersion Include="Verify" Version="31.3.0" />
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<PackageVersion Include="Verify.DiffPlex" Version="3.1.2" />
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<PackageVersion Include="Verify.ImageMagick" Version="3.7.7" />
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<PackageVersion Include="Verify.NUnit" Version="31.3.0" />
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<PackageVersion Include="Microsoft.Sbom.Targets" Version="4.1.2" />
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</ItemGroup>

‎src/Tests/GlobalUsings.cs‎

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global using System.Runtime.CompilerServices;
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global using EmailPreviewServices;
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global using VerifyTests.DiffPlex;

‎src/Tests/ModuleInitializer.cs‎

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{
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VerifyDiffPlex.Initialize(OutputType.Compact);
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VerifierSettings.InitializePlugins();
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VerifyImageMagick.RegisterComparers(.01);
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}
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}

‎src/Tests/Samples.GeneratePreviews#Outlook2016.verified.png‎

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‎src/Tests/Samples.GeneratePreviews.verified.txt‎

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{
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Html:
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>Test Email</title>
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</head>
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<body style="font-family: Arial, sans-serif; background-color: #f4f4f4; margin: 0; padding: 20px;">
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<div style="max-width: 600px; margin: 0 auto; background-color: white; padding: 20px; border-radius: 10px;">
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<h1 style="color: #333;">Welcome to Our Service!</h1>
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<p style="color: #666; line-height: 1.6;">
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This is a test email to demonstrate the email preview functionality.
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</p>
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<a href="https://example.com"
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style="display: inline-block; padding: 10px 20px; background-color: #007bff;
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color: white; text-decoration: none; border-radius: 5px; margin-top: 10px;">
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Get Started
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</a>
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<p style="color: #999; font-size: 12px; margin-top: 30px;">
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© 2025 Your Company. All rights reserved.
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</p>
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</div>
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</body>
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</html>,
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Devices: [
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Outlook2016
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]
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}

‎src/Tests/Samples.Simple.verified.png‎

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‎src/Tests/Samples.cs‎

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using EmailPreviewServices;
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using SixLabors.ImageSharp;
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using SixLabors.ImageSharp.PixelFormats;
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using SixLabors.ImageSharp.Processing;
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[TestFixture]
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[TestFixture]
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public class Samples
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{
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static readonly HttpClient httpClient;
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static readonly EmailPreviewServicesClient service;
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static Samples()
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{
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var apiKey = Environment.GetEnvironmentVariable("EmailPreviewServicesApiKey")!;
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httpClient = new HttpClient();
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httpClient.DefaultRequestHeaders.Add("X-API-Key", apiKey);
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httpClient.DefaultRequestHeaders.Authorization = new("Bearer", apiKey);
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httpClient.DefaultRequestHeaders.Accept.Add(new("application/json"));
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service = new("https://app.emailpreviewservices.com/api", httpClient);
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var apiKey = VerifyEmailPreviewServices.ApiKey;
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HttpClient client = new();
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client.DefaultRequestHeaders.Add("X-API-Key", apiKey);
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client.DefaultRequestHeaders.Authorization = new("Bearer", apiKey);
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client.DefaultRequestHeaders.Accept.Add(new("application/json"));
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service = new("https://app.emailpreviewservices.com/api", client);
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}
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[Test]
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}
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[Test]
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[Explicit]
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public async Task Simple()
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public async Task GeneratePreviews()
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{
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var html =
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"""
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</body>
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</html>
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""";
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var preview = await service.ExecutePreviewAsync(
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new()
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{
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Name = "the name",
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Body = html,
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Subject = "subhect",
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Devices = ["microsoft_outlook_2016"],
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});
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const int maxAttempts = 30;
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var delay = TimeSpan.FromSeconds(2);
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Stream streamAsync = null!;
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for (var i = 0; i < maxAttempts; i++)
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{
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var devicesPreview = await service.GetDevicePreviewAsync(preview.Id, "microsoft_outlook_2016");
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if (devicesPreview.Status == DevicePreviewDataStatus.SUCCESSFUL)
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{
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streamAsync = await httpClient.GetStreamAsync(devicesPreview.Preview.Original);
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break;
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}
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await Task.Delay(delay);
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}
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using var image =await Image.LoadAsync<Rgba32>(streamAsync);
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var cropHeight = image.Height;
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for (var y = image.Height - 1; y >= 0; y--)
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var preview = new EmailPreview
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{
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var hasContent = false;
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for (var x = 0; x < image.Width; x++)
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{
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var pixel = image[x, y];
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if (pixel.R < 240 || pixel.G < 240 || pixel.B < 240)
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{
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hasContent = true;
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break;
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}
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}
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if (hasContent)
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{
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cropHeight = y + 1;
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break;
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}
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}
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image.Mutate(ctx => ctx.Crop(image.Width, cropHeight));
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var memoryStream = new MemoryStream();
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await image.SaveAsPngAsync(memoryStream);
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memoryStream.Position = 0;
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await service.DeletePreviewAsync(preview.Id);
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await Verify(memoryStream, extension: "png");
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// await using var streamAsync = await httpClient.GetStreamAsync(preview.Body);
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// await using var fileStream = File.Create("temp.html");
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// await streamAsync.CopyToAsync(fileStream);
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Html = html,
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Devices = [Device.Outlook2016]
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};
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await Verify(preview);
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}
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}

‎src/Tests/Tests.csproj‎

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<PackageReference Include="MarkdownSnippets.MsBuild" PrivateAssets="all" />
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<PackageReference Include="NUnit" />
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<PackageReference Include="NUnit3TestAdapter" />
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<PackageReference Include="SixLabors.ImageSharp" />
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<PackageReference Include="Verify.DiffPlex" />
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<PackageReference Include="Verify.ImageMagick" />
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<PackageReference Include="Verify.NUnit" />
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<PackageReference Include="Microsoft.NET.Test.Sdk" />
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<ProjectReference Include="..\Verify.EmailPreviewServices\Verify.EmailPreviewServices.csproj" />

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