Improve integration testing

Content.IntegrationTests/ContentIntegrationTest.cs

@@ -0,0 +1,27 @@
+using Content.Client;
+using Content.Client.Interfaces.Parallax;
+using Robust.Shared.ContentPack;
+using Robust.Shared.IoC;
+using Robust.UnitTesting;
+
+namespace Content.IntegrationTests
+{
+    public abstract class ContentIntegrationTest : RobustIntegrationTest
+    {
+        protected override ClientIntegrationInstance StartClient(ClientIntegrationOptions options = null)
+        {
+            options = options ?? new ClientIntegrationOptions();
+            options.BeforeStart += () =>
+            {
+                IoCManager.Resolve<IModLoader>().SetModuleBaseCallbacks(new ClientModuleTestingCallbacks
+                {
+                    ClientBeforeIoC = () =>
+                    {
+                        IoCManager.Register<IParallaxManager, DummyParallaxManager>(true);
+                    }
+                });
+            };
+            return base.StartClient(options);
+        }
+    }
+}