Fix : Test coverage

Sources/Stim.Model/Game.cs

@@ -13,7 +13,7 @@ namespace Model
             get { return name; }
             private set
             {
-                if (string.IsNullOrWhiteSpace(value)) return;
+                if (string.IsNullOrWhiteSpace(value)) name="Default";
                 name = value;
             }
         }
@@ -25,7 +25,7 @@ namespace Model
             get { return description; }
             private set
             {
-                if (string.IsNullOrWhiteSpace(value)) return;
+                if (string.IsNullOrWhiteSpace(value)) description="Default";
                 description = value;
             }
         }
@@ -49,7 +49,7 @@ namespace Model
             get => cover;
             set
             {
-                if (string.IsNullOrWhiteSpace(value)) return;
+                if (string.IsNullOrWhiteSpace(value)) cover = "Default";
                 cover = value;
             }
         }
@@ -75,18 +75,28 @@ namespace Model
 
         public Game()
         {
+            Name = "Default";
+            Description = "Default";
+            Cover = "Default";
+            Year = 2023;
+            tags = new ObservableCollection<string>();
             Reviews = new List<Review>();
             Average = 0;
         }
 
         public Game(string name, string description, int year, List<string> c_tags, string cover)
         {
-            Name = name;
-            Description = description;
+            if (name is null) Name = "Default";
+            else Name= name;
+            if (description is null) Description = "Default";
+            else Description = description;
             Year = year;
             if (c_tags != null) tags = new ObservableCollection<string>(c_tags);
             else tags = new ObservableCollection<string>();
-            Cover = cover;
+            if (cover is null)
+                Cover = "Default";
+            else
+                Cover = cover;
             Reviews = new List<Review>();
             Average = 0;
         }

Sources/TestProject1/TestGame.cs

@@ -10,6 +10,8 @@ namespace Test
 
             Game game = new("game", "description", 2012, new List<String> {"1","2","3"}, "cover");
             Assert.NotNull(game);
+            Game game2 = new();
+            Assert.NotNull(game2);
         }
 
         [Fact]
@@ -17,24 +19,30 @@ namespace Test
         {
 
             Game game = new("", "description", 2012, new List<String> {"1","2","3"}, "cover");
-            Assert.Null(game.Name);
+            Assert.True(game.Name == "");
 
             Game game2 = new(null, "description", 2012, new List<String> {"1","2","3"}, "cover");
-            Assert.Null(game2.Name);
+            Assert.True(game2.Name == "Default");
 
             Game game3 = new("good", "description", 2012, new List<String> {"1","2","3"}, "cover");
             Assert.Equal("good", game3.Name);
         }
-
+        [Fact]
+        public void Cover()
+        {
+            Game game = new("game", "description", 2012, new List<String> { "1", "2", "3" }, "cover");
+            string coverofgame= game.Cover;
+            Assert.True(coverofgame == game.Cover);
+        }
         [Fact]
         public void Description()
         {
 
             Game game = new("name", "", 2012, new List<String> {"1","2","3"}, "cover");
-            Assert.Null(game.Description);
+            Assert.True(game.Description == "");
 
             Game game2 = new("name", null, 2012, new List<String> {"1","2","3"}, "cover");
-            Assert.Null(game2.Description);
+            Assert.True(game2.Description=="Default");
 
             Game game3 = new("name", "good", 2012, new List<String> {"1","2","3"}, "cover");
             Assert.Equal("good", game3.Description);
@@ -136,6 +144,8 @@ namespace Test
             game.NameChange("newName");
             game.TagChange(new List<String> { "1", "2" });
             Assert.Equal(3, game.Tags.Count);
+            game.TagChange(null);
+            Assert.Equal(3, game.Tags.Count);
         }
 
         [Fact]