Test1

src/main/java/Notizbuch.java

@@ -8,7 +8,7 @@ import javax.swing.JFrame;
 
 public class Notizbuch extends JFrame implements ActionListener {
 
-	private JTextArea textArea;
+	JTextArea textArea;
 	private JButton saveButton;
 	private JButton loadButton;
 
@@ -18,8 +18,8 @@ public class Notizbuch extends JFrame implements ActionListener {
 		setDefaultCloseOperation(EXIT_ON_CLOSE);
 		setLayout(new BorderLayout());
 
-		textArea = new JTextArea();
-		add(new JScrollPane(textArea), BorderLayout.CENTER);
+		setTextArea(new JTextArea());
+		add(new JScrollPane(getTextArea()), BorderLayout.CENTER);
 
 		saveButton = new JButton("Speichern");
 		saveButton.addActionListener(this);
@@ -43,23 +43,23 @@ public class Notizbuch extends JFrame implements ActionListener {
 
 	}
 
-	private void saveNote() {
+	public void saveNote() {
 		try (PrintWriter writer = new PrintWriter(new FileWriter("notizen.txt"))) {
-			writer.print(textArea.getText());
+			writer.print(getTextArea().getText());
 			JOptionPane.showMessageDialog(this, "Notiz erfolgreich gespeichert!");
 		} catch (IOException e) {
 			JOptionPane.showMessageDialog(this, "Fehler beim Speichern der Notiz: " + e.getMessage());
 		}
 	}
 
-	private void loadNote() {
+	public void loadNote() {
 		try (BufferedReader reader = new BufferedReader(new FileReader("notizen.txt"))) {
 			StringBuilder noteText = new StringBuilder();
 			String line;
 			while ((line = reader.readLine()) != null) {
 				noteText.append(line).append("\n");
 			}
-			textArea.setText(noteText.toString());
+			getTextArea().setText(noteText.toString());
 		} catch (IOException e) {
 			JOptionPane.showMessageDialog(this, "Fehler beim Laden der Notiz: " + e.getMessage());
 		}
@@ -71,4 +71,12 @@ public class Notizbuch extends JFrame implements ActionListener {
 			  notizbuch.setVisible(true);
 		 });	
 	}
+
+	public JTextArea getTextArea() {
+		return textArea;
+	}
+
+	public void setTextArea(JTextArea textArea) {
+		this.textArea = textArea;
+	}
 }

src/test/java/NotizbuchTest.java

@@ -0,0 +1,21 @@
+import static org.junit.jupiter.api.Assertions.*;
+
+import org.junit.jupiter.api.Test;
+
+class NotizbuchTest {
+
+	@Test
+	 public void testSpeichernUndLaden() {
+        Notizbuch notizbuch = new Notizbuch();
+        notizbuch.textArea.setText("Testnotiz");
+
+        notizbuch.saveNote();
+
+        notizbuch.loadNote();
+
+        assertEquals("Testnotiz\n", notizbuch.textArea.getText());
+    }
+
+
+
+}