Refactor repeated test host setup

JobTrackerApi.Tests/JobApplicationsApplicationPackageTests.cs

@@ -3,12 +3,12 @@ using JobTrackerApi.Controllers;
 using JobTrackerApi.Data;
 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;
 using Microsoft.Extensions.Logging.Abstractions;
-using Microsoft.Extensions.Options;
 using Moq;
 using Xunit;
 
@@ -475,29 +475,12 @@ public sealed class JobApplicationsApplicationPackageTests
 
     private static JobTrackerContext CreateDb()
     {
-        var options = new DbContextOptionsBuilder<JobTrackerContext>()
-            .UseInMemoryDatabase(Guid.NewGuid().ToString())
-            .Options;
-        var currentUser = new Mock<ICurrentUserService>();
-        currentUser.SetupGet(service => service.UserId).Returns("user-1");
-        return new JobTrackerContext(options, currentUser.Object);
+        return TestHostFactory.CreateInMemoryDb();
     }
 
     private static Mock<UserManager<ApplicationUser>> CreateUserManager(ApplicationUser? user = null)
     {
-        var store = new Mock<IUserStore<ApplicationUser>>();
-        var manager = 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>>());
-        manager.Setup(x => x.FindByIdAsync(It.IsAny<string>())).ReturnsAsync((string id) => user is not null && user.Id == id ? user : null);
-        return manager;
+        return TestHostFactory.CreateUserManager(user);
     }
 
     private sealed class TestCvTemplateRenderer : ICvTemplateRenderer