Refactor repeated test host setup

JobTrackerApi.Tests/AuthAndSystemControllerTests.cs

@@ -1,13 +1,13 @@
 using JobTrackerApi.Controllers;
 using JobTrackerApi.Models;
 using JobTrackerApi.Services;
+using JobTrackerApi.Tests.TestSupport;
 using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Identity;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.EntityFrameworkCore.Query;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.Logging.Abstractions;
-using Microsoft.Extensions.Options;
 using Moq;
 using System.Collections;
 using System.Linq.Expressions;
@@ -162,18 +162,7 @@ public sealed class AuthAndSystemControllerTests
 
     private static Mock<UserManager<ApplicationUser>> CreateUserManager()
     {
-        var store = new Mock<IUserStore<ApplicationUser>>();
-        return new Mock<UserManager<ApplicationUser>>(
-            store.Object,
-            Options.Create(new IdentityOptions()),
-            new PasswordHasher<ApplicationUser>(),
-            Array.Empty<IUserValidator<ApplicationUser>>(),
-            Array.Empty<IPasswordValidator<ApplicationUser>>(),
-            new UpperInvariantLookupNormalizer(),
-            new IdentityErrorDescriber(),
-            null!,
-            new NullLogger<UserManager<ApplicationUser>>()
-        );
+        return TestHostFactory.CreateUserManager();
     }
 
     private sealed class TestAsyncQueryProvider<TEntity> : IAsyncQueryProvider