src/test/java/HitoriControlPanelTest.java

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+import GUI.GameUIController;
+import GUI.HitoriControlPanel;
+import javafx.scene.control.Button;
+import javafx.scene.control.Label;
+import org.junit.jupiter.api.*;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.testfx.framework.junit5.ApplicationExtension;
+import static org.mockito.Mockito.*;
+import static org.junit.jupiter.api.Assertions.*;
+
+@ExtendWith(ApplicationExtension.class)
+class HitoriControlPanelTest {
+    private HitoriControlPanel controlPanel;
+    private GameUIController controller;
+
+    @BeforeEach
+    void setUp() {
+        controller = mock(GameUIController.class);
+        controlPanel = new HitoriControlPanel(controller);
+    }
+
+    @Test
+    void testInitialization() {
+        assertNotNull(controlPanel);
+        assertTrue(controlPanel.getChildren().size() > 0);
+    }
+
+    @Test
+    void testUpdateTimerLabel() {
+        controlPanel.updateTimerLabel(42);
+        var timerLabel = findLabelByText(controlPanel, "Time: 42s");
+        assertNotNull(timerLabel);
+    }
+
+    @Test
+    void testUpdateMistakeLabel() {
+        controlPanel.updateMistakeLabel(5);
+        var mistakeLabel = findLabelByText(controlPanel, "Mistakes: 5");
+        assertNotNull(mistakeLabel);
+    }
+
+    @Test
+    void testSetPauseButtonText() {
+        controlPanel.setPauseButtonText("Test");
+        var pauseButton = findButtonByText(controlPanel, "Test");
+        assertNotNull(pauseButton);
+    }
+
+    @Test
+    void testPauseButtonAction() {
+        var pauseButton = findButtonByText(controlPanel, "Pause");
+        assertNotNull(pauseButton);
+
+        pauseButton.fire();
+        verify(controller, times(1)).togglePause();
+    }
+
+    @Test
+    void testResetButtonAction() {
+        var resetButton = findButtonByText(controlPanel, "Reset");
+        assertNotNull(resetButton);
+
+        resetButton.fire();
+        verify(controller, times(1)).resetGame();
+    }
+
+    @Test
+    void testUndoButtonAction() {
+        var undoButton = findButtonByText(controlPanel, "Undo");
+        assertNotNull(undoButton);
+
+        undoButton.fire();
+        verify(controller, times(1)).undo();
+    }
+
+    @Test
+    void testRedoButtonAction() {
+        var redoButton = findButtonByText(controlPanel, "Redo");
+        assertNotNull(redoButton);
+
+        redoButton.fire();
+        verify(controller, times(1)).redo();
+    }
+
+    @Test
+    void testCheckSolutionButtonAction() {
+        var checkButton = findButtonByText(controlPanel, "Check Solution");
+        assertNotNull(checkButton);
+
+        checkButton.fire();
+        verify(controller, times(1)).checkSolution();
+    }
+
+    @Test
+    void testNewGameButtonAction() {
+        var newGameButton = findButtonByText(controlPanel, "New Game");
+        assertNotNull(newGameButton);
+
+        newGameButton.fire();
+        verify(controller, times(1)).newGame();
+    }
+
+    @Test
+    void testShowErrorsButtonAction() {
+        var showErrorsButton = findButtonByText(controlPanel, "Show Errors");
+        assertNotNull(showErrorsButton);
+
+        showErrorsButton.fire();
+        verify(controller, times(1)).showErrors();
+    }
+
+    private Label findLabelByText(HitoriControlPanel panel, String text) {
+        return (Label) panel.getChildren().stream()
+                .filter(node -> node instanceof Label && ((Label) node).getText().equals(text))
+                .findFirst()
+                .orElse(null);
+    }
+
+    private Button findButtonByText(HitoriControlPanel panel, String text) {
+        return (Button) panel.getChildren().stream()
+                .flatMap(node -> node.lookupAll("Button").stream())
+                .filter(node -> node instanceof Button && ((Button) node).getText().equals(text))
+                .findFirst()
+                .orElse(null);
+    }
+}