✅ Add a NumberFace test

Sources/Tests/Model_UTs/Dice/NumberDieTest.cs

@@ -0,0 +1,27 @@
+using Model.Dice;
+using Model.Dice.Faces;
+using Xunit;
+
+namespace Tests.Model_UTs.Dice
+{
+    public class NumberDieTest
+    {
+
+        [Fact]
+        public void TestGetRandomFace()
+        {
+            // Arrange
+            int val1 = 1, val2 = 2;
+            NumberDie die = new(new NumberFace(val1), new NumberFace(val2));
+
+            // Act
+
+            Face<int> thing = die.GetRandomFace();
+
+            // Assert
+
+            Assert.IsType<NumberFace>(thing);
+            Assert.True(thing.Value == val1 || thing.Value == val2);
+        }
+    }
+}