diff --git a/packages/shared/src/lib/__tests__/board.test.ts b/packages/shared/src/lib/__tests__/board.test.ts
index 07d1bca..6017ef1 100644
--- a/packages/shared/src/lib/__tests__/board.test.ts
+++ b/packages/shared/src/lib/__tests__/board.test.ts
@@ -16,7 +16,14 @@ test("create rhombitrihexagonal board", () => {
   );
   const graph = createGraph(intersections, Color.EMPTY);
 
-  // Remark: This test case is not independent of implementation
+  expect(
+    graph.reduce<number>(
+      (prev, _, index, g) => prev + g.neighbors(index).length,
+      0,
+    ),
+  ).toEqual(6 * 4 + 12 * 3);
+
+  // Remark: This assertion is not independent of implementation
   // Also see PolygonalBoardHelper lines 4 - 28
   expect(graph.neighbors(0)).toEqual([1, 5, 6, 17]);
 });
diff --git a/packages/shared/src/lib/abstractBoard/boardFactory.ts b/packages/shared/src/lib/abstractBoard/boardFactory.ts
index 9235d71..46944eb 100644
--- a/packages/shared/src/lib/abstractBoard/boardFactory.ts
+++ b/packages/shared/src/lib/abstractBoard/boardFactory.ts
@@ -130,8 +130,7 @@ export function createGraph<TIntersection extends Intersection, TColor>(
       intersections.indexOf(neighbour),
     ),
   );
-  const graph = new Graph<TColor>(adjacencyMatrix).fill(startColor);
-  return graph;
+  return new Graph<TColor>(adjacencyMatrix).fill(startColor);
 }
 
 function createRthBoard<TIntersection extends Intersection>(