Add a test to check that maps are not saved postmapinit (#1987)

Content.IntegrationTests/Tests/PostMapInitTest.cs

@@ -0,0 +1,60 @@
+using System.IO;
+using System.Linq;
+using System.Threading.Tasks;
+using NUnit.Framework;
+using Robust.Shared.Interfaces.Resources;
+using Robust.Shared.Utility;
+using YamlDotNet.RepresentationModel;
+
+namespace Content.IntegrationTests.Tests
+{
+    [TestFixture]
+    public class PostMapInitTest : ContentIntegrationTest
+    {
+        public readonly string[] SkippedMaps =
+        {
+            "/Maps/Pathfinding/simple.yml"
+        };
+
+        [Test]
+        public async Task NoSavedPostMapInitTest()
+        {
+            var server = StartServerDummyTicker();
+
+            await server.WaitIdleAsync();
+
+            var resourceManager = server.ResolveDependency<IResourceManager>();
+            var mapFolder = new ResourcePath("/Maps");
+            var maps = resourceManager
+                .ContentFindFiles(mapFolder)
+                .Where(filePath => filePath.Extension == "yml" && !filePath.Filename.StartsWith("."))
+                .ToArray();
+
+            foreach (var map in maps)
+            {
+                var rootedPath = map.ToRootedPath();
+
+                if (SkippedMaps.Contains(rootedPath.ToString()))
+                {
+                    continue;
+                }
+
+                if (!resourceManager.TryContentFileRead(rootedPath, out var fileStream))
+                {
+                    Assert.Fail($"Map not found: {rootedPath}");
+                }
+
+                using var reader = new StreamReader(fileStream);
+                var yamlStream = new YamlStream();
+
+                yamlStream.Load(reader);
+
+                var root = yamlStream.Documents[0].RootNode;
+                var meta = root["meta"];
+                var postMapInit = meta["postmapinit"].AsBool();
+
+                Assert.False(postMapInit);
+            }
+        }
+    }
+}