Added test for crosses in first column

Week 11 - TTTTests/UnitTest1.cs

@@ -53,5 +53,18 @@ namespace Week_11___TTTTests
             var actual = _gameWinnerService.Validate(_gameBoard);
             Assert.AreEqual(expected, actual);
         }
+
+        [TestMethod]
+        public void TestPlayerWithCrossesInFirstColIsWinner()
+        {
+            const char expected = 'X';
+
+            _gameBoard[0, 0] = expected;
+            _gameBoard[1, 0] = expected;
+            _gameBoard[2, 0] = expected;
+
+            var actual = _gameWinnerService.Validate(_gameBoard);
+            Assert.AreEqual(expected, actual);
+        }
     }
 }