Refactor repeated test host setup

JobTrackerApi.Tests/BackupControllerTests.cs

@@ -2,11 +2,10 @@ using JobTrackerApi.Controllers;
 using JobTrackerApi.Data;
 using JobTrackerApi.Models;
 using JobTrackerApi.Services;
+using JobTrackerApi.Tests.TestSupport;
 using Microsoft.AspNetCore.DataProtection;
 using Microsoft.AspNetCore.Mvc;
-using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.Logging.Abstractions;
-using Moq;
 using Xunit;
 
 namespace JobTrackerApi.Tests;
@@ -34,11 +33,6 @@ public sealed class BackupControllerTests
 
     private static JobTrackerContext CreateDb()
     {
-        var options = new DbContextOptionsBuilder<JobTrackerContext>()
-            .UseInMemoryDatabase(Guid.NewGuid().ToString())
-            .Options;
-        var currentUser = new Mock<ICurrentUserService>();
-        currentUser.SetupGet(x => x.UserId).Returns("user-1");
-        return new JobTrackerContext(options, currentUser.Object);
+        return TestHostFactory.CreateInMemoryDb();
     }
 }