sequence equak issues

Sources/Model/Dice/DiceGroupManager.cs

@@ -25,6 +25,21 @@ namespace Model.Dice
             return Task.FromResult(toAdd);
         }
 
+        public Task<DiceGroup> AddCheckName(DiceGroup toAdd)
+        {
+            if (string.IsNullOrWhiteSpace(toAdd.Name))
+            {
+                throw new ArgumentNullException(nameof(toAdd), "param should not be null or empty");
+
+            }
+            if (diceGroups.Where(d => d.Name.Equals(toAdd.Name)).Any())
+            {
+                throw new ArgumentException("this dice group already exists", nameof(toAdd));
+            }
+            diceGroups.Add(new(toAdd.Name.Trim(), toAdd.Dice));
+            return Task.FromResult(toAdd);
+        }
+
         public Task<ReadOnlyCollection<DiceGroup>> GetAll()
         {
             return Task.FromResult(new ReadOnlyCollection<DiceGroup>(diceGroups));

Sources/Tests/Data_UTs/Dice/DiceGroupManagerTest.cs

@@ -77,13 +77,13 @@ namespace Tests.Data_UTs.Dice
         {
             DiceGroupManager dgm = new();
 
-            await dgm.Add(new("Monopoly", new List<NumberDie> { new NumberDie(new NumberFace(5), new NumberFace(7)), new NumberDie(new NumberFace(5), new NumberFace(7)) }));
+            await dgm.AddCheckName(new("Monopoly", new List<NumberDie> { new NumberDie(new NumberFace(5), new NumberFace(7)), new NumberDie(new NumberFace(5), new NumberFace(7)) }));
             DiceGroup group1 = new("Monopoly", new List<NumberDie> { new NumberDie(new NumberFace(5), new NumberFace(7)), new NumberDie(new NumberFace(5), new NumberFace(7)) });
 
-            async Task actionAsync() => await dgm.Add(group1);
+            async Task actionAsync() => await dgm.AddCheckName(group1);
 
             // Assert
-            await Xunit.Assert.ThrowsAsync<Exception>(actionAsync);
+            await Xunit.Assert.ThrowsAsync<ArgumentException>(actionAsync);
 
         }
 
@@ -112,7 +112,7 @@ namespace Tests.Data_UTs.Dice
             DiceGroup toAdd = new("Monopoly", new List<NumberDie> { new NumberDie(new NumberFace(5), new NumberFace(7)), new NumberDie(new NumberFace(5), new NumberFace(7)) });
             
             await dgm.Add(toAdd);
-            async Task action() => dgm.GetOneByName(name);
+            async Task action() => await dgm.GetOneByName(name);
 
             // Assert
            await Xunit.Assert.ThrowsAsync<ArgumentNullException>(action);