added improvements on set proces and minor other improvements

Fuchs.Tests/Fuchs.Tests.csproj

@@ -10,7 +10,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.7.0" />
-    <PackageReference Include="xunit" Version="2.9.3" />
+    <PackageReference Include="xunit.v3" Version="3.2.2" />
     <PackageReference Include="xunit.runner.visualstudio" Version="3.1.5">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>

Fuchs.Tests/InvoiceOptionsTests.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using Fuchs.intranet;
@@ -31,8 +31,11 @@ public class InvoiceOptionsTests
         => Assert.Equal("", InvoiceOptionsFor(new { type = "r" }));
 
     [Fact]
-    public void DefaultSetPrice_OmitsToken()
-        => Assert.Equal("", InvoiceOptionsFor(new { type = "r", setmode = "setprice" }));
+    public void ExplicitDefaultSetPrice_EmitsToken()
+        // An explicit choice of the default mode must still be persisted — otherwise it is
+        // indistinguishable from an invoice that was never switched to set-pricing at all
+        // (the editor relies on this to hide the "Set-Preisanzeige" menu entry once chosen).
+        => Assert.Equal("setmode:setprice", InvoiceOptionsFor(new { type = "r", setmode = "setprice" }));
 
     [Theory]
     [InlineData("itemprices", "setmode:itemprices")]

Fuchs.Tests/ProcessWebComServiceTests.cs

@@ -141,7 +141,7 @@ public class ProcessWebComServiceTests
         Assert.True(result);
         Assert.Equal(1, handler.CallCount);
         var json = JObject.Parse(handler.LastRequestBody!);
-        Assert.Equal("dev-inbox@example.test", json["recipient"]!.ToString());
+        Assert.Equal("dev-inbox@example.test", json["communication"]!["to"]!.ToString());
     }
 
     [Fact]
@@ -153,7 +153,7 @@ public class ProcessWebComServiceTests
         await svc.SendEmailAsync("inv_ov2", "Rechnung 123", "<p>hi</p>", "realcustomer@example.de", "Kunde");
 
         var json = JObject.Parse(handler.LastRequestBody!);
-        string subject = json["subject"]!.ToString();
+        string subject = json["communication"]!["subject"]!.ToString();
         Assert.Contains("realcustomer@example.de", subject);
         Assert.Contains("Rechnung 123", subject);
     }
@@ -169,7 +169,7 @@ public class ProcessWebComServiceTests
         Assert.True(result);
         Assert.Equal(1, handler.CallCount);
         var json = JObject.Parse(handler.LastRequestBody!);
-        Assert.Equal("dev-inbox@example.test", json["recipient"]!.ToString());
+        Assert.Equal("dev-inbox@example.test", json["communication"]!["to"]!.ToString());
     }
 
     [Fact]
@@ -181,7 +181,7 @@ public class ProcessWebComServiceTests
         await svc.SendEmailAsync("inv_ov4", "Subject", "<p>hi</p>", "realcustomer@example.de", "Kunde");
 
         var json = JObject.Parse(handler.LastRequestBody!);
-        Assert.Equal("realcustomer@example.de", json["recipient"]!.ToString());
+        Assert.Equal("realcustomer@example.de", json["communication"]!["to"]!.ToString());
     }
 
     // ── Override enforcement across every real appsettings*.json environment ───
@@ -194,9 +194,9 @@ public class ProcessWebComServiceTests
     // hand-typed literal - so a future edit that silently breaks the override key
     // or its value in any appsettings*.json file would fail this test.
     //
-    // Note: this API has a single "recipient" field - there is no distinct
+    // Note: this API has a single "communication.to" field - there is no distinct
     // to/cc/bcc concept anywhere in the codebase (see ProcessWebComService.
-    // SendEmailAsync / payload.recipient). "to/cc/bcc cleared" is therefore fully
+    // SendEmailAsync / communication.to). "to/cc/bcc cleared" is therefore fully
     // satisfied by asserting that field no longer carries the original recipient
     // once an override is configured.
     public static IEnumerable<object[]> AppSettingsEnvironments()
@@ -236,7 +236,7 @@ public class ProcessWebComServiceTests
         Assert.True(result);
         Assert.Equal(1, handler.CallCount);
         var json = JObject.Parse(handler.LastRequestBody!);
-        string sentRecipient = json["recipient"]!.ToString();
+        string sentRecipient = json["communication"]!["to"]!.ToString();
 
         if (!string.IsNullOrWhiteSpace(overrideRecipient))
         {
@@ -266,7 +266,7 @@ public class ProcessWebComServiceTests
         Assert.True(result);
         Assert.NotNull(handler.LastRequestBody);
         var json = JObject.Parse(handler.LastRequestBody!);
-        var att = (JArray)json["attachments"]!;
+        var att = (JArray)json["communication"]!["attachments"]!;
         Assert.Single(att);
         Assert.Equal("Rechnung.pdf",        att[0]!["filename"]!.ToString());
         Assert.Equal("application/pdf",      att[0]!["mimeType"]!.ToString());