Add a unit test project and set up a test in memory DB

Start_Tests/Start_Tests.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net5.0</TargetFramework>
+
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.9.4" />
+    <PackageReference Include="MSTest.TestAdapter" Version="2.2.3" />
+    <PackageReference Include="MSTest.TestFramework" Version="2.2.3" />
+    <PackageReference Include="coverlet.collector" Version="3.0.2" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Start\Server\Start.Server.csproj" />
+    <ProjectReference Include="..\Start\Shared\Start.Shared.csproj" />
+  </ItemGroup>
+</Project>

Start_Tests/UnitTest1.cs

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+using System;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using Start.Server.Models;
+
+namespace Start_Tests {
+	[TestClass]
+	public class UnitTest1 : UnitTestWithDb {
+		public TestContext TestContext { get; set; }
+
+		[TestMethod]
+		public override void TestDatabaseOK() {
+			base.TestDatabaseOK();
+		}
+
+		[TestMethod]
+		public void TestMethod1() {
+			TestContext.WriteLine("Running TestMethod1 from TestContext");
+		}
+	}
+}

Start_Tests/UnitTestWithDb.cs

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+using System;
+using IdentityServer4.EntityFramework.Options;
+using Microsoft.Data.Sqlite;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Options;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using Start.Server.Data;
+using Start.Server.Models;
+
+namespace Start_Tests {
+	public class UnitTestWithDb : IDisposable {
+		private const string InMemoryConnectionString = "DataSource=:memory:";
+		private SqliteConnection _connection;
+
+		protected readonly ApplicationDbContext _db;
+
+		public UnitTestWithDb() {
+			_connection = new SqliteConnection(InMemoryConnectionString);
+			_connection.Open();
+
+			var options = new DbContextOptionsBuilder<ApplicationDbContext>()
+				.UseSqlite(_connection)
+				.Options;
+
+			this._db = new ApplicationDbContext(options,
+				Options.Create(new OperationalStoreOptions()));
+			this._db.Database.EnsureCreated();
+		}
+
+		protected void ResetDb() {
+			_db.Database.EnsureDeleted();
+			_db.Database.EnsureCreated();
+		}
+
+		protected void FillDbTestData() {
+			ApplicationUser testUser = new ApplicationUser {
+				Id = "test_user",
+				UserName = "test_user"
+			};
+			_db.Users.Add(testUser);
+			_db.SaveChanges();
+
+			BookmarkContainer testContainer = new BookmarkContainer(testUser.Id, "Test Container",
+				0);
+			_db.BookmarkContainers.Add(testContainer);
+			_db.SaveChanges();
+
+			BookmarkGroup testGroup = new BookmarkGroup("Test Group", "#000000", 0,
+				testContainer.BookmarkContainerId);
+			_db.BookmarkGroups.Add(testGroup);
+			_db.SaveChanges();
+
+			Bookmark testBookmark = new Bookmark("Test Bookmark", "http://example.com",
+				"Test Notes", 0, testGroup.BookmarkGroupId);
+			_db.Bookmarks.Add(testBookmark);
+			_db.SaveChanges();
+		}
+
+		/// <summary>
+		/// Checks the DB connection works. Note that MSTest won't run this - you need to do so in
+		/// inheriting classes like this:
+		///
+		/// <code>
+		/// [TestMethod]
+		/// public override void TestDatabaseOK() {
+		/// 	base.TestDatabaseOK();
+		/// }
+		/// </code>
+		/// </summary>
+		[TestMethod]
+		public virtual void TestDatabaseOK() {
+			Assert.IsTrue(this._db.Database.CanConnect());
+		}
+
+		public void Dispose() {
+			_connection.Close();
+		}
+	}
+}