Add tests and squish last bugs

Memory.Test/CardTest.cs

@@ -0,0 +1,41 @@
+using Memory.Logic;
+
+namespace Memory.Test
+{
+    [TestClass]
+    public class CardTest
+    {
+        [TestMethod]
+        public void Matches_SameCards_ShouldEqualTrue()
+        {
+            Card card1 = new(0);
+            Card card2 = new(0);
+            Assert.IsTrue(card1.Matches(card2));
+        }
+
+        [TestMethod]
+        public void Matches_DifferentCard_ShouldEqualFalse()
+        {
+            Card card1 = new(0);
+            Card card2 = new(1);
+            Assert.IsFalse(card1.Matches(card2));
+        }
+
+        [TestMethod]
+        public void Selected_IsSelected_ShouldEqualTrue()
+        {
+            Card card = new(0)
+            {
+                IsChoice1 = true
+            };
+            Assert.IsTrue(card.Selected());
+        }
+
+        [TestMethod]
+        public void Selected_NotSelected_ShouldEqualFalse()
+        {
+            Card card = new(0);
+            Assert.IsFalse(card.Selected());
+        }
+    }
+}