Added a button to redirect to stock market page from portfolio tab

Added GameControllerTest

src/main/java/millions/view/GameView.java

@@ -57,12 +57,14 @@ public class GameView extends BorderPane implements PlayerListener, ExchangeList
   private final Button buyButton = new Button("Buy");
   private final Button sellButton = new Button("Sell");
   private final Button advanceButton = new Button("Advance week");
+  private final TabPane tabPane;
   private boolean updatingQuantityControls;
 
   public GameView(GameController controller) {
     this.controller = controller;
+    this.tabPane = createTabs();
     setTop(createHeader());
-    setCenter(createTabs());
+    setCenter(tabPane);
     configureStocksList();
     configureButtons();
     configureQuantityControls();
@@ -169,11 +171,34 @@ protected void updateItem(String profit, boolean empty) {
                 setStyle(profit.startsWith("-") ? "-fx-text-fill: red;" : "-fx-text-fill: green;");
               }
             });
-
+    TableColumn<Share, Share> marketColumn = new TableColumn<>("Market");
+    marketColumn.setMinWidth(100);
+    marketColumn.setCellFactory(column -> {
+      return new TableCell<Share, Share>() {
+        private final Button button = new Button("Market Page");
+
+        @Override
+        protected void updateItem(Share share, boolean empty) {
+          super.updateItem(share, empty);
+
+          if (empty) {
+            setGraphic(null);
+          } else {
+            button.setOnAction(event -> {
+              Share s = getTableView().getItems().get(getIndex());
+              getTabPane().getSelectionModel().select(0);
+              stocksList.getSelectionModel().select(s.getStock());
+              showStockChart(s.getStock());
+            });
+            setGraphic(button);
+          }
+        }
+      };
+    });
     portfolioTable
         .getColumns()
         .addAll(
-            symbolColumn, quantityColumn, purchasePriceColumn, currentPriceColumn, profitColumn);
+            symbolColumn, quantityColumn, purchasePriceColumn, currentPriceColumn, profitColumn, marketColumn);
     return new Tab("Portfolio", portfolioTable);
   }
 
@@ -457,6 +482,9 @@ private int getCurrentMaxBuyable() {
     return Math.max(1, controller.getMaxBuyableQuantity(selected.getSymbol()));
   }
 
+  public TabPane getTabPane() {
+    return this.tabPane;
+  }
   private String formatStock(Stock stock) {
     return ViewUtils.formatStock(stock);
   }

src/test/java/millions/controller/GameControllerTest.java

@@ -0,0 +1,27 @@
+package millions.controller;
+
+import millions.controller.fileIO.UncheckedFileNotFoundException;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import java.math.BigDecimal;
+import java.nio.file.Path;
+
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+public class GameControllerTest {
+  GameController gameController;
+  @BeforeEach
+  public void setUpController() {
+    this.gameController = new GameController();
+  }
+
+  @Test
+  public void startGameFileNotFoundTest() {
+    String name = "name";
+    BigDecimal startingMoney =  new BigDecimal("100");
+    Path stockFilePath = Path.of("nonexistantfile");
+    int prerunWeeks = 1;
+    assertThrows(UncheckedFileNotFoundException.class, () -> {gameController.startGame(name,startingMoney,stockFilePath,prerunWeeks);});
+  }
+}