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/Tests/ConnectTest.cs

@@ -0,0 +1,56 @@
+using System.Linq;
+using System.Threading.Tasks;
+using NUnit.Framework;
+using Robust.Server.Interfaces.Player;
+using Robust.Shared.Enums;
+using Robust.Shared.Interfaces.GameObjects;
+using Robust.Shared.Interfaces.Network;
+using Robust.Shared.IoC;
+
+namespace Content.IntegrationTests.Tests
+{
+    [TestFixture]
+    public class ConnectTest : ContentIntegrationTest
+    {
+        [Test]
+        public async Task TestConnect()
+        {
+            var client = StartClient();
+            var server = StartServer();
+
+            await Task.WhenAll(client.WaitIdleAsync(), server.WaitIdleAsync());
+
+            // Connect.
+
+            client.SetConnectTarget(server);
+
+            client.Post(() => IoCManager.Resolve<IClientNetManager>().ClientConnect(null, 0, null));
+
+            // Run some ticks for the handshake to complete and such.
+
+            for (var i = 0; i < 10; i++)
+            {
+                server.RunTicks(1);
+                await server.WaitIdleAsync();
+                client.RunTicks(1);
+                await client.WaitIdleAsync();
+            }
+
+            await Task.WhenAll(client.WaitIdleAsync(), server.WaitIdleAsync());
+
+            // Basic checks to ensure that they're connected and data got replicated.
+
+            var playerManager = server.ResolveDependency<IPlayerManager>();
+            Assert.That(playerManager.PlayerCount, Is.EqualTo(1));
+            Assert.That(playerManager.GetAllPlayers().First().Status, Is.EqualTo(SessionStatus.InGame));
+
+            var clEntityManager = client.ResolveDependency<IEntityManager>();
+            var svEntityManager = server.ResolveDependency<IEntityManager>();
+
+            var lastSvEntity = svEntityManager.GetEntities().Last();
+            var lastClEntity = clEntityManager.GetEntity(lastSvEntity.Uid);
+
+            Assert.That(lastClEntity.Transform.GridPosition, Is.EqualTo(lastSvEntity.Transform.GridPosition));
+        }
+    }
+}