tictactoe: number of fields added to the gui

src/main/java/de/tims/tictactoe/GameLogic.java

@@ -1,5 +1,9 @@
 package de.tims.tictactoe;
 
+import java.awt.GridLayout;
+
+import javax.swing.BoxLayout;
+import javax.swing.JButton;
 import javax.swing.JPanel;
 
 public class GameLogic {
@@ -97,8 +101,15 @@ public class GameLogic {
 	}
 
 	public JPanel generateGUI() {
-		// TODO Auto-generated method stub
-		return new JPanel();
+		JButton[] fields = new JButton[(int) Math.pow(this.board.length, 2)];
+		JPanel contentPanel = new JPanel();
+		contentPanel.setLayout(new GridLayout(this.board.length, this.board.length));
+		
+		for (int i = 0; i < fields.length; i++) {
+			fields[i] = new JButton();
+			contentPanel.add(fields[i]);
+		}
+		return contentPanel;
 	}
 
 }

src/test/java/de/tims/tictactoe/GameLogicTest.java

@@ -3,8 +3,11 @@ package de.tims.tictactoe;
 import static org.junit.jupiter.api.Assertions.assertArrayEquals;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 
+import java.awt.Component;
 import java.util.stream.Stream;
 
+import javax.swing.JButton;
+import javax.swing.JComponent;
 import javax.swing.JPanel;
 
 import org.junit.jupiter.api.BeforeAll;
@@ -63,6 +66,21 @@ class GameLogicTest {
 		assertEquals(expectedResult.getClass(), realResult.getClass());
 	}
 	
+	@Test
+	void numberOfGUIFieldsTest() {
+		int realResult = 0;
+		int expectedResult = (int) Math.pow(SIZE, 2);
+	
+		JPanel gui = game.generateGUI();
+		Component[] components = gui.getComponents();
+		
+		for (Component component : components) {
+			if (component instanceof JButton) realResult++;
+		}
+		
+		assertEquals(expectedResult, realResult);
+	}
+	
 	 @ParameterizedTest(name = "[{index}] {0} -> {2} fields")
 	 @MethodSource("testCasesForCountPlayfields")
 	 void fieldCountTest(String testName, int size, int expectedResult) {