Extend managed macOS client toward feature parity

dotnet/tests/VoiceCat.Tests/ServerProfileTests.cs

@@ -47,4 +47,31 @@ public sealed class ServerProfileTests
     {
         Assert.Throws<ArgumentException>(() => ServerProfile.Create("voice.example", 8384, ServerAuthentication.Account));
     }
+
+    [Fact]
+    public void SwiftProfilesImportAndAreBackedUpOnManagedSave()
+    {
+        string directory = Path.Combine(Path.GetTempPath(), "voicecat-profile-" + Guid.NewGuid().ToString("N"));
+        string path = Path.Combine(directory, "servers.json");
+        Guid accountId = Guid.NewGuid();
+        try
+        {
+            Directory.CreateDirectory(directory);
+            File.WriteAllText(path, $$"""
+                [{"id":"{{accountId:D}}","host":"voice.example","port":8384,"authMode":"password","savedUsername":"talon","nickname":null,"keychainTag":"voicecat.server.legacy"}]
+                """);
+            var store = new ServerProfileStore(path);
+            ServerProfile profile = Assert.Single(store.Load());
+            Assert.Equal(ServerAuthentication.Account, profile.Authentication);
+            Assert.Equal("talon", profile.Username);
+            Assert.Equal("voicecat.server.legacy", profile.LegacyKeychainTag);
+
+            store.Save([profile]);
+            Assert.True(File.Exists(path + ".swift-backup.json"));
+            string managed = File.ReadAllText(path);
+            Assert.Contains("\"authentication\": \"Account\"", managed);
+            Assert.DoesNotContain("keychainTag", managed);
+        }
+        finally { if (Directory.Exists(directory)) Directory.Delete(directory, true); }
+    }
 }