Move test projects from src/ to tests/ (#11357)

* Update gitignore

* Move csproj

* Update project references

* Update solutions

* Update build scripts

* Tests used to share editorconfig with projects in src

* Fix broken tests.

* Stop copying around .editorconfig

merged root one with linting

* csharp_style_expression_bodied -> suggestion

* Move StyleCop rulesets to matching directories and update shared build properties

* Remove legacy build files, update NuGet.cofig and solution files

* Restore myget source

* Clean up .gitignore

* Update .gitignore

* Move new test classes to tests after merge

* Gitignore + nuget config

* Move new test

Co-authored-by: Ronald Barendse <ronald@barend.se>

tests/Umbraco.Tests.Integration/TestServerTest/UmbracoWebApplicationFactory.cs

@@ -0,0 +1,40 @@
+// Copyright (c) Umbraco.
+// See LICENSE for more details.
+
+using System;
+using Microsoft.AspNetCore.Mvc.Testing;
+using Microsoft.Extensions.Hosting;
+
+namespace Umbraco.Cms.Tests.Integration.TestServerTest
+{
+    public class UmbracoWebApplicationFactory<TStartup> : WebApplicationFactory<TStartup>
+        where TStartup : class
+    {
+        private readonly Func<IHostBuilder> _createHostBuilder;
+        private readonly Action<IHost> _beforeStart;
+
+        /// <summary>
+        /// Constructor to create a new WebApplicationFactory
+        /// </summary>
+        /// <param name="createHostBuilder">Method to create the IHostBuilder</param>
+        /// <param name="beforeStart">Method to perform an action before IHost starts</param>
+        public UmbracoWebApplicationFactory(Func<IHostBuilder> createHostBuilder, Action<IHost> beforeStart = null)
+        {
+            _createHostBuilder = createHostBuilder;
+            _beforeStart = beforeStart;
+        }
+
+        protected override IHostBuilder CreateHostBuilder() => _createHostBuilder();
+
+        protected override IHost CreateHost(IHostBuilder builder)
+        {
+            IHost host = builder.Build();
+
+            _beforeStart?.Invoke(host);
+
+            host.Start();
+
+            return host;
+        }
+    }
+}