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/StartTest.cs

@@ -0,0 +1,46 @@
+using System.Threading.Tasks;
+using NUnit.Framework;
+using Robust.Shared.Exceptions;
+
+namespace Content.IntegrationTests.Tests
+{
+    [TestFixture]
+    public class StartTest : ContentIntegrationTest
+    {
+        /// <summary>
+        ///     Test that the server starts.
+        /// </summary>
+        [Test]
+        public async Task TestServerStart()
+        {
+            var server = StartServer();
+            server.RunTicks(5);
+            await server.WaitIdleAsync();
+            Assert.That(server.IsAlive);
+            var runtimeLog = server.ResolveDependency<IRuntimeLog>();
+            Assert.That(runtimeLog.ExceptionCount, Is.EqualTo(0), "No exceptions must be logged.");
+            server.Stop();
+            await server.WaitIdleAsync();
+            Assert.That(!server.IsAlive);
+        }
+
+        /// <summary>
+        ///     Test that the client starts.
+        /// </summary>
+        [Test]
+        public async Task TestClientStart()
+        {
+            var client = StartClient();
+            await client.WaitIdleAsync();
+            Assert.That(client.IsAlive);
+            client.RunTicks(5);
+            await client.WaitIdleAsync();
+            Assert.That(client.IsAlive);
+            var runtimeLog = client.ResolveDependency<IRuntimeLog>();
+            Assert.That(runtimeLog.ExceptionCount, Is.EqualTo(0), "No exceptions must be logged.");
+            client.Stop();
+            await client.WaitIdleAsync();
+            Assert.That(!client.IsAlive);
+        }
+    }
+}