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/SaveLoadSaveTest.cs

@@ -0,0 +1,107 @@
+using System.IO;
+using System.Threading.Tasks;
+using NUnit.Framework;
+using Robust.Server.Interfaces.Maps;
+using Robust.Server.Interfaces.Timing;
+using Robust.Shared.Interfaces.Map;
+using Robust.Shared.Interfaces.Resources;
+using Robust.Shared.Map;
+using Robust.Shared.Utility;
+
+namespace Content.IntegrationTests.Tests
+{
+    /// <summary>
+    ///     Tests that the
+    /// </summary>
+    [TestFixture]
+    public class SaveLoadSaveTest : ContentIntegrationTest
+    {
+        [Test]
+        public async Task SaveLoadSave()
+        {
+            var server = StartServer();
+            await server.WaitIdleAsync();
+            var mapLoader = server.ResolveDependency<IMapLoader>();
+            var mapManager = server.ResolveDependency<IMapManager>();
+            server.Post(() =>
+            {
+                mapLoader.SaveBlueprint(new GridId(2), "save load save 1.yml");
+                var mapId = mapManager.CreateMap();
+                var grid = mapLoader.LoadBlueprint(mapId, "save load save 1.yml");
+                mapLoader.SaveBlueprint(grid.Index, "save load save 2.yml");
+            });
+
+            await server.WaitIdleAsync();
+            var userData = server.ResolveDependency<IResourceManager>().UserData;
+
+            string one;
+            string two;
+
+            using (var stream = userData.Open(new ResourcePath("save load save 1.yml"), FileMode.Open))
+            using (var reader = new StreamReader(stream))
+            {
+                one = reader.ReadToEnd();
+            }
+
+            using (var stream = userData.Open(new ResourcePath("save load save 2.yml"), FileMode.Open))
+            using (var reader = new StreamReader(stream))
+            {
+                two = reader.ReadToEnd();
+            }
+
+            Assert.That(one, Is.EqualTo(two));
+        }
+
+        /// <summary>
+        ///     Loads the default map, runs it for 5 ticks, then assert that it did not change.
+        /// </summary>
+        [Test]
+        public async Task LoadSaveTicksSaveStationStation()
+        {
+            var server = StartServer();
+            await server.WaitIdleAsync();
+            var mapLoader = server.ResolveDependency<IMapLoader>();
+            var mapManager = server.ResolveDependency<IMapManager>();
+            var pauseMgr = server.ResolveDependency<IPauseManager>();
+
+            IMapGrid grid = default;
+
+            // Load stationstation.yml as uninitialized map, and save it to ensure it's up to date.
+            server.Post(() =>
+            {
+                var mapId = mapManager.CreateMap();
+                pauseMgr.AddUninitializedMap(mapId);
+                grid = mapLoader.LoadBlueprint(mapId, "Maps/stationstation.yml");
+                mapLoader.SaveBlueprint(grid.Index, "load save ticks save 1.yml");
+            });
+
+            // Run 5 ticks.
+            server.RunTicks(5);
+
+            server.Post(() =>
+            {
+                mapLoader.SaveBlueprint(grid.Index, "load save ticks save 2.yml");
+            });
+
+            await server.WaitIdleAsync();
+            var userData = server.ResolveDependency<IResourceManager>().UserData;
+
+            string one;
+            string two;
+
+            using (var stream = userData.Open(new ResourcePath("load save ticks save 1.yml"), FileMode.Open))
+            using (var reader = new StreamReader(stream))
+            {
+                one = reader.ReadToEnd();
+            }
+
+            using (var stream = userData.Open(new ResourcePath("load save ticks save 2.yml"), FileMode.Open))
+            using (var reader = new StreamReader(stream))
+            {
+                two = reader.ReadToEnd();
+            }
+
+            Assert.That(one, Is.EqualTo(two));
+        }
+    }
+}