Extract game user admin service

RpgRoller.Tests/Services/ServiceAdminAndCampaignDeletionTests.cs

@@ -18,6 +18,9 @@ public sealed class ServiceAdminAndCampaignDeletionTests
         var adminSession = ServiceTestSupport.GetValue(service.Login("admin", "Password123")).SessionToken;
         var memberSession = ServiceTestSupport.GetValue(service.Login("member", "Password123")).SessionToken;
 
+        var usernames = ServiceTestSupport.GetValue(service.GetUsernames(memberSession));
+        Assert.Equal(["admin", "member"], usernames);
+
         var forbiddenList = service.GetUsers(memberSession);
         Assert.False(forbiddenList.Succeeded);
 
@@ -28,6 +31,10 @@ public sealed class ServiceAdminAndCampaignDeletionTests
         var promoted = ServiceTestSupport.GetValue(service.UpdateUserRoles(adminSession, memberUser.Id, [UserRoles.Admin]));
         Assert.Contains(promoted.Roles, role => string.Equals(role, UserRoles.Admin, StringComparison.OrdinalIgnoreCase));
 
+        var invalidRole = service.UpdateUserRoles(adminSession, memberUser.Id, [UserRoles.Admin, "gm"]);
+        Assert.False(invalidRole.Succeeded);
+        Assert.Equal("invalid_role", invalidRole.Error?.Code);
+
         var selfDemote = service.UpdateUserRoles(adminSession, bootstrapAdmin.Id, Array.Empty<string>());
         Assert.False(selfDemote.Succeeded);
 
@@ -111,6 +118,9 @@ public sealed class ServiceAdminAndCampaignDeletionTests
         var deleteResult = ServiceTestSupport.GetValue(service.DeleteUser(adminSession, gmUser.Id));
         Assert.True(deleteResult);
 
+        Assert.Null(service.GetUserBySession(gmSession));
+        Assert.False(service.GetMe(gmSession).Succeeded);
+        Assert.False(service.GetUsernames(gmSession).Succeeded);
         Assert.False(service.GetCampaign(adminSession, gmOwnedCampaign.Id).Succeeded);
 
         var playerCharacters = ServiceTestSupport.GetValue(service.GetOwnCharacters(playerSession));