support multiple failed

Author: SimonCropp

src/Directory.Build.props

@@ -2,7 +2,7 @@
 <Project>
   <PropertyGroup>
     <NoWarn>CS1591;CS0649;NU1608;NU1109</NoWarn>
-    <Version>0.1.1</Version>
+    <Version>0.1.2</Version>
     <AssemblyVersion>0.1.0</AssemblyVersion>
     <LangVersion>preview</LangVersion>
     <PackageTags>Email, Preview, Verify</PackageTags>

src/Tests/Tests.csproj

@@ -2,6 +2,8 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFramework>net10.0</TargetFramework>
+    <!-- remove when ImageMagick is patched https://github.com/advisories/GHSA-q3hc-j9x5-mp9m-->
+    <NoWarn>$(NoWarn);NU1902</NoWarn>
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="MarkdownSnippets.MsBuild" PrivateAssets="all" />

src/Verify.EmailPreviewServices/Builder.cs

@@ -75,13 +75,18 @@ static async Task GetDevicePreviews(EmailPreviewData preview)
             await Task.Delay(1000);
             var previews = await Service.GetPreviewAsync(preview.Id);
 
-            var failed = previews.Previews.SingleOrDefault(_ => _.Status == DevicePreviewDataStatus.FAILED);
-            if (failed != null)
+            var failed = previews
+                .Previews
+                .Where(_ => _.Status == DevicePreviewDataStatus.FAILED)
+                .Select(_=>_.DeviceKey)
+                .ToList();
+            if (failed.Count > 0)
             {
-                throw new($"Preview failed to generate. DeviceKey: {failed.DeviceKey}");
+                throw new($"Preview failed to generate. DeviceKeys: {string.Join(", ", failed)}");
             }
 
-            if (previews.Previews.All(_ => _.Status == DevicePreviewDataStatus.SUCCESSFUL))
+            if (previews.Previews
+                .All(_ => _.Status == DevicePreviewDataStatus.SUCCESSFUL))
             {
                 return;
             }