diff --git a/Sources/MaSoluction/Testeur/TesterStub.cs b/Sources/MaSoluction/Testeur/TesterStub.cs
index 9b9966d..9d6bd2b 100644
--- a/Sources/MaSoluction/Testeur/TesterStub.cs
+++ b/Sources/MaSoluction/Testeur/TesterStub.cs
@@ -35,5 +35,17 @@ namespace Testeur
             //Assert
             Assert.NotEqual(n, m.GetDice().Count);
         }
+
+        [Fact]
+        public void TesterNullMethodeRandom()
+        {
+            //Arange
+            Manager m = new Manager(new Stub());
+
+            int n = m.GetDice().Count();
+            NumberDie nd = null;
+            Assert.False(m.AddDice(nd));
+            Assert.False(m.RemoveDice(nd));
+        }
     }
 }