diff --git a/Qwirkle/TestBase/TestGame.cs b/Qwirkle/TestBase/TestGame.cs
index b72fd6c..82704f7 100644
--- a/Qwirkle/TestBase/TestGame.cs
+++ b/Qwirkle/TestBase/TestGame.cs
@@ -157,7 +157,7 @@ public class TestGame
 
         game.EmptyCellUsed();
 
-        Assert.Equal(0, game.CellsUsed.Count);
+        Assert.Empty(game.CellsUsed);
     }
 
     [Fact]
@@ -316,11 +316,11 @@ public class TestGame
 
         if (except)
         {
-            Assert.True(game.IsMoveCorrect(t3, 0, 1, game.GetBoard()));
+            Assert.True(game.IsMoveCorrect(t3, 0, 1, game.GetBoard()!));
         }
         else
         {
-            Assert.False(game.IsMoveCorrect(t2, 0, 1, game.GetBoard()));
+            Assert.False(game.IsMoveCorrect(t2, 0, 1, game.GetBoard()!));
         }
     }