Refactor repeated test host setup

JobTrackerApi.Tests/JobApplicationsMariaDraftTests.cs

@@ -3,6 +3,7 @@ using JobTrackerApi.Controllers;
 using JobTrackerApi.Data;
 using JobTrackerApi.Models;
 using JobTrackerApi.Services;
+using JobTrackerApi.Tests.TestSupport;
 using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.EntityFrameworkCore;
@@ -53,26 +54,11 @@ public sealed class JobApplicationsMariaDraftTests
 
     private static Mock<Microsoft.AspNetCore.Identity.UserManager<ApplicationUser>> CreateUserManager()
     {
-        var store = new Mock<Microsoft.AspNetCore.Identity.IUserStore<ApplicationUser>>();
-        return new Mock<Microsoft.AspNetCore.Identity.UserManager<ApplicationUser>>(
-            store.Object,
-            null!,
-            null!,
-            null!,
-            null!,
-            null!,
-            null!,
-            null!,
-            null!);
+        return TestHostFactory.CreateUserManager();
     }
 
     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();
     }
 }