✅ Fix UT, fix Tests.csproj, move UT file to proper folder

Sources/Tests/Model_UTs/Dice/DiceGroupDbManagerTest.cs

@@ -1,12 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace Tests.Model_UTs.Dice
-{
-    public class DiceGroupDbManagerTest
-    {
-    }
-}

Sources/Tests/Model_UTs/Dice/DiceGroupManagerTest.cs

@@ -0,0 +1,63 @@
+using Data;
+using Model.Dice;
+using Model.Games;
+using System.Collections.Generic;
+using System.Linq;
+using Xunit;
+
+namespace Tests.Model_UTs.Dice
+{
+    public class DiceGroupManagerTest
+    {
+
+        private readonly MasterOfCeremonies stubGameRunner = new Stub().LoadApp();
+
+        [Fact]
+        public void TestConstructorReturnsEmptyEnumerable()
+        {
+            // Arrange
+            DiceGroupManager diceGroupManager = new();
+            Dictionary<string, IEnumerable<Die>> expected;
+            Dictionary<string, IEnumerable<Die>> actual;
+
+            // Act
+            expected = new Dictionary<string, IEnumerable<Die>>();
+            actual = (Dictionary<string, IEnumerable<Die>>)diceGroupManager.GetAll();
+
+            // Assert
+            Assert.Equal(expected, actual);
+        }
+
+        [Fact]
+        public void TestAddWhenDiceGroupThenDoAddAndReturnDiceGroup()
+        {
+            // Arrange
+            DiceGroupManager dgm = new();
+            KeyValuePair<string, IEnumerable<Die>> group1 = stubGameRunner.DiceGroupManager.GetAll().First();
+            KeyValuePair<string, IEnumerable<Die>> group2 = stubGameRunner.DiceGroupManager.GetAll().Last();
+
+            // Act
+
+            //...adding keys and values to some dictionary for future comparison
+            Dictionary<string, IEnumerable<Die>> expected = new()
+            {
+                { group1.Key, group1.Value },
+                { group2.Key, group2.Value }
+            };
+
+            //...storing the results of DiceGroupManager.Add() in variables 
+            KeyValuePair<string, IEnumerable<Die>> resultFromAdd1 = dgm.Add(group1);
+            KeyValuePair<string, IEnumerable<Die>> resultFromAdd2 = dgm.Add(group2);
+
+            //...using those variables to fill a second dictionary for comparison
+            Dictionary<string, IEnumerable<Die>> actual = new()
+            {
+                { resultFromAdd1.Key, resultFromAdd1.Value },
+                { resultFromAdd2.Key, resultFromAdd2.Value }
+            };
+
+            // Assert
+            Assert.Equal(expected, actual);
+        }
+    }
+}