Split PoolManager into separate classes. (#19370)

Content.IntegrationTests/Pair/TestPair.Helpers.cs

@@ -0,0 +1,39 @@
+#nullable enable
+using System.Linq;
+using Robust.Shared.Map;
+
+namespace Content.IntegrationTests.Pair;
+
+// Contains misc helper functions to make writing tests easier.
+public sealed partial class TestPair
+{
+    /// <summary>
+    /// Creates a map, a grid, and a tile, and gives back references to them.
+    /// </summary>
+    public async Task<TestMapData> CreateTestMap()
+    {
+        await Server.WaitIdleAsync();
+        var tileDefinitionManager = Server.ResolveDependency<ITileDefinitionManager>();
+
+        var mapData = new TestMapData();
+        await Server.WaitPost(() =>
+        {
+            mapData.MapId = Server.MapMan.CreateMap();
+            mapData.MapUid = Server.MapMan.GetMapEntityId(mapData.MapId);
+            mapData.MapGrid = Server.MapMan.CreateGrid(mapData.MapId);
+            mapData.GridUid = mapData.MapGrid.Owner; // Fixing this requires an engine PR.
+            mapData.GridCoords = new EntityCoordinates(mapData.GridUid, 0, 0);
+            var plating = tileDefinitionManager["Plating"];
+            var platingTile = new Tile(plating.TileId);
+            mapData.MapGrid.SetTile(mapData.GridCoords, platingTile);
+            mapData.MapCoords = new MapCoordinates(0, 0, mapData.MapId);
+            mapData.Tile = mapData.MapGrid.GetAllTiles().First();
+        });
+        
+        if (Settings.Connected)
+            await RunTicksSync(10);
+
+        TestMap = mapData;
+        return mapData;
+    }
+}