Integration tests improvements:

1. Added dummy game ticker for future tests to reduce startup time of test. (no loading a map)
2. Re-organized tests a bit.

Content.IntegrationTests/ContentIntegrationTest.cs

@@ -1,9 +1,13 @@
 using Content.Client;
 using Content.Client.Interfaces.Parallax;
+using Content.Server;
+using Content.Server.GameTicking;
+using Content.Server.Interfaces.GameTicking;
 using Robust.Shared.ContentPack;
 using Robust.Shared.Interfaces.Configuration;
 using Robust.Shared.IoC;
 using Robust.UnitTesting;
+using EntryPoint = Content.Client.EntryPoint;
 
 namespace Content.IntegrationTests
 {
@@ -11,7 +15,7 @@ namespace Content.IntegrationTests
     {
         protected override ClientIntegrationInstance StartClient(ClientIntegrationOptions options = null)
         {
-            options = options ?? new ClientIntegrationOptions();
+            options ??= new ClientIntegrationOptions();
             // ReSharper disable once RedundantNameQualifier
             options.ClientContentAssembly = typeof(EntryPoint).Assembly;
             options.SharedContentAssembly = typeof(Shared.EntryPoint).Assembly;
@@ -33,10 +37,27 @@ namespace Content.IntegrationTests
 
         protected override ServerIntegrationInstance StartServer(ServerIntegrationOptions options = null)
         {
-            options = options ?? new ServerIntegrationOptions();
+            options ??= new ServerIntegrationOptions();
             options.ServerContentAssembly = typeof(Server.EntryPoint).Assembly;
             options.SharedContentAssembly = typeof(Shared.EntryPoint).Assembly;
             return base.StartServer(options);
         }
+
+        protected ServerIntegrationInstance StartServerDummyTicker(ServerIntegrationOptions options = null)
+        {
+            options ??= new ServerIntegrationOptions();
+            options.BeforeStart += () =>
+            {
+                IoCManager.Resolve<IModLoader>().SetModuleBaseCallbacks(new ServerModuleTestingCallbacks
+                {
+                    ServerBeforeIoC = () =>
+                    {
+                        IoCManager.Register<IGameTicker, DummyGameTicker>(true);
+                    }
+                });
+            };
+
+            return StartServer(options);
+        }
     }
 }