Add: Game UI test:

- Ensures FXML loads and controller initializes without errors.

src/test/java/ch/unibas/dmi/dbis/cs108/casono/client/ui/gameui/CasinoGameControllerUiTest.java

@@ -0,0 +1,56 @@
+package ch.unibas.dmi.dbis.cs108.casono.client.ui.gameui;
+
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import ch.unibas.dmi.dbis.cs108.casono.client.ui.gameui.gameuicomponents.TaskbarController;
+import java.net.URL;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.TimeUnit;
+import javafx.application.Platform;
+import javafx.fxml.FXMLLoader;
+import javafx.scene.Parent;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+
+/** Smoke test for Taskbar UI. Ensures FXML loads and controller initializes without errors. */
+class CasinoGameControllerUITest {
+
+    private static boolean fxStarted = false;
+
+    /** Initializes JavaFX once before all tests. */
+    @BeforeAll
+    static void startJavaFX() throws Exception {
+        if (!fxStarted) {
+            CountDownLatch latch = new CountDownLatch(1);
+
+            try {
+                Platform.startup(
+                        () -> {
+                            Platform.setImplicitExit(false);
+                            latch.countDown();
+                        });
+            } catch (IllegalStateException ignored) {
+                latch.countDown();
+            }
+
+            assertTrue(latch.await(10, TimeUnit.SECONDS), "JavaFX did not start");
+            fxStarted = true;
+        }
+    }
+
+    /** Ensures FXML loads and controller initializes without errors. */
+    @Test
+    void taskbarLoadsWithoutErrors() throws Exception {
+        URL url = getClass().getResource("/ui-structure/gameuicomponents/Taskbar.fxml");
+        assertNotNull(url);
+
+        FXMLLoader loader = new FXMLLoader(url);
+        Parent root = loader.load();
+
+        TaskbarController controller = loader.getController();
+
+        assertNotNull(root);
+        assertNotNull(controller);
+    }
+}

src/test/java/ch/unibas/dmi/dbis/cs108/casono/client/ui/gameui/gameuicomponents/TaskbarControllerInputValidationTest.java

@@ -1,37 +1,175 @@
 package ch.unibas.dmi.dbis.cs108.casono.client.ui.gameui.gameuicomponents;
 
-import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.junit.jupiter.api.Assertions.*;
 
-import ch.unibas.dmi.dbis.cs108.casono.client.game.GameState;
-import ch.unibas.dmi.dbis.cs108.casono.client.game.Player;
-import ch.unibas.dmi.dbis.cs108.casono.client.game.PlayerId;
+import ch.unibas.dmi.dbis.cs108.casono.client.game.*;
+import java.lang.reflect.Field;
+import java.lang.reflect.Method;
+import java.net.URL;
 import java.util.List;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.TimeUnit;
+import javafx.application.Platform;
+import javafx.fxml.FXMLLoader;
+import javafx.scene.Parent;
+import javafx.scene.control.Button;
+import javafx.scene.control.TextField;
+import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.Test;
 
+/**
+ * TODO: Refactor UI tests to avoid reflection and test behavior via public APIs or real UI actions
+ * (preferably using TestFX) for better maintainability and robustness.
+ *
+ * <p>These tests verify: - input validation behavior - UI state updates based on game state -
+ * correct enabling/disabling of action buttons
+ */
 class TaskbarControllerInputValidationTest {
 
+    private static boolean fxStarted = false;
+
+    /** Initializes JavaFX once before all tests. */
+    @BeforeAll
+    static void initJavaFX() throws Exception {
+        if (fxStarted) {
+            return;
+        }
+
+        CountDownLatch latch = new CountDownLatch(1);
+
+        try {
+            Platform.startup(
+                    () -> {
+                        Platform.setImplicitExit(false);
+                        latch.countDown();
+                    });
+        } catch (IllegalStateException ignored) {
+            latch.countDown();
+        }
+
+        latch.await(10, TimeUnit.SECONDS);
+        fxStarted = true;
+    }
+
+    /** Ensures invalid input values do not enable the BET button. */
     @Test
-    void updateLogicRunsWithoutCrash() {
+    void invalidInputShouldBeRejected() throws Exception {
+        Fixture f = load();
+
+        String[] invalidInputs = {"", "abc", "-1", "999999999999"};
+
+        for (String input : invalidInputs) {
+            setText(f.input, input);
+
+            invokePrivate(f.controller, "refreshBetInputUi");
+
+            Button bet = get(f.controller, "betButton", Button.class);
+
+            assertFalse(bet.isVisible(), "Invalid input must not enable BET button: " + input);
+        }
+    }
+
+    /** Ensures valid input enables the BET button. */
+    @Test
+    void validInputShouldEnableBet() throws Exception {
+        Fixture f = load();
+
+        GameState state = createGameState();
+
+        setField(f.controller, "myPlayerId", PlayerId.of("me"));
+        setField(f.controller, "lastState", state);
+        setField(f.controller, "inputActionAllowed", true);
+
+        f.controller.update(state, PlayerId.of("me"));
+
+        setText(f.input, "200");
+
+        invokePrivate(f.controller, "refreshBetInputUi");
+
+        Button bet = get(f.controller, "betButton", Button.class);
+
+        assertTrue(bet.isVisible(), "BET button should be enabled for valid input");
+    }
+
+    /** Ensures all UI actions are disabled when the game is finished. */
+    @Test
+    void finishedStateShouldDisableUi() throws Exception {
+        Fixture f = load();
+
+        GameState state = createGameState();
+        state.phase = "FINISHED";
+
+        f.controller.update(state, PlayerId.of("me"));
+
+        assertTrue(f.input.isDisabled());
+        assertTrue(get(f.controller, "callButton", Button.class).isDisabled());
+        assertTrue(get(f.controller, "foldButton", Button.class).isDisabled());
+        assertTrue(get(f.controller, "raiseButton", Button.class).isDisabled());
+    }
+
+    /** Creates a minimal game state for testing. */
+    private GameState createGameState() {
         GameState state = new GameState();
 
-        state.players = List.of(
-                new Player(PlayerId.of("me"), 20000),
-                new Player(PlayerId.of("other"), 20000)
-        );
+        Player me = new Player(PlayerId.of("me"), 20000);
+        Player other = new Player(PlayerId.of("other"), 20000);
 
+        state.players = List.of(me, other);
         state.phase = "PREFLOP";
         state.currentBet = 200;
         state.activePlayer = 0;
 
-        DummyController controller = new DummyController();
-
-        controller.update(state, PlayerId.of("me"));
-
-        assertTrue(true);
+        return state;
     }
 
-    static class DummyController {
-        void update(GameState state, PlayerId id) {
-        }
+    /** Loads the JavaFX controller and its UI components. */
+    private Fixture load() throws Exception {
+        URL url = getClass().getResource("/ui-structure/gameuicomponents/Taskbar.fxml");
+        assertNotNull(url);
+
+        FXMLLoader loader = new FXMLLoader(url);
+        Parent root = loader.load();
+
+        root.applyCss();
+        root.layout();
+
+        TaskbarController controller = loader.getController();
+
+        TextField input = get(controller, "taskbarInput", TextField.class);
+        Button bet = get(controller, "betButton", Button.class);
+
+        return new Fixture(controller, input, bet);
     }
+
+    private record Fixture(TaskbarController controller, TextField input, Button betButton) {}
+
+    private static void setText(TextField field, String value) {
+        field.setText(value);
+    }
+
+    private static void invokePrivate(Object obj, String method) throws Exception {
+        Method m = obj.getClass().getDeclaredMethod(method);
+        m.setAccessible(true);
+        m.invoke(obj);
+    }
+
+    private static <T> T get(Object obj, String field, Class<T> type) throws Exception {
+        Field f = obj.getClass().getDeclaredField(field);
+        f.setAccessible(true);
+        return type.cast(f.get(obj));
+    }
+
+    /** Sets a private field value using reflection. */
+    private static void setField(Object obj, String fieldName, Object value) throws Exception {
+        Field field = obj.getClass().getDeclaredField(fieldName);
+        field.setAccessible(true);
+        field.set(obj, value);
+    }
+
+    /** Gets a private field value using reflection. */
+    // private static <T> T getField(Object obj, String fieldName, Class<T> type) throws Exception {
+    //    Field field = obj.getClass().getDeclaredField(fieldName);
+    //    field.setAccessible(true);
+    //    return type.cast(field.get(obj));
+    // }
 }