Changed WFC acceptance to 100% connectivity and added test case to test the layer generation.

Scripts/Tests/TestRunner.cs

@@ -37,6 +37,7 @@ public partial class TestRunner : Node
         Run("For node stops after configured amount", TestForNodeStopsAfterConfiguredAmount);
         Run("Paused world does not drain survival", TestPausedWorldDoesNotDrainSurvival);
         Run("Open gate hides gate content", TestOpenGateHidesGateContent);
+        Run("Layer generation succeeds above threshold", TestLayerGenerationSuccessRate);
         Run("Item data readable names are stable", TestItemDataReadableNames);
         Run("Resource files load core game data", TestResourceFilesLoadCoreData);
 
@@ -502,6 +503,40 @@ public partial class TestRunner : Node
         AssertFalse(layer.tiles[0, 0].ContentNode.Visible, "gate content should be hidden");
     }
 
+    private void TestLayerGenerationSuccessRate()
+    {
+        const int layerCount = 1000;
+        const float minimumSuccessRate = 0.90f;
+
+        GameData.layerSize = 20;
+        WFC.FillAdjacencies();
+        Dictionary<string, MeshInstance3D> tileMeshes = ResourceLoader.LoadTiles();
+
+        int successfulLayers = 0;
+
+        for (int i = 0; i < layerCount; i++)
+        {
+            Layer layer = new Layer();
+            layer._Ready();
+            layer.SetupLayer(GameData.layerSize, 0, tileMeshes, new Vector2I());
+
+            if (IsGeneratedLayerValid(layer))
+            {
+                successfulLayers++;
+            }
+
+            layer.Free();
+        }
+
+        float successRate = successfulLayers / (float)layerCount;
+        GD.Print($"Layer generation success rate: {successfulLayers}/{layerCount} ({successRate:P2})");
+
+        AssertTrue(
+            successRate >= minimumSuccessRate,
+            $"layer generation success rate should be at least {minimumSuccessRate:P0}, got {successRate:P2}"
+        );
+    }
+
     private void TestItemDataReadableNames()
     {
         AssertEqual("Iron gear", ItemData.GetReadableName("iron_gear"), "readable name");
@@ -539,6 +574,31 @@ public partial class TestRunner : Node
         return layer;
     }
 
+    private bool IsGeneratedLayerValid(Layer layer)
+    {
+        bool hasGate = false;
+
+        foreach (Tile tile in layer.tiles)
+        {
+            if (tile.collapsedMesh == null)
+            {
+                return false;
+            }
+
+            if (tile.collapsedMesh == "gate")
+            {
+                hasGate = true;
+            }
+        }
+
+        if (!hasGate)
+        {
+            return false;
+        }
+
+        return WFC.IsMapConnected(layer.tiles, 1f);
+    }
+
     private void AssertTrue(bool value, string message)
     {
         if (!value)