test_ButtonTest

src/test/java/ChatGUITest.java

@@ -53,6 +53,14 @@ public class ChatGUITest {
         Font expectedFont = chatGUI.outputTextArea.getFont().deriveFont(Font.PLAIN, 20);
         assertEquals(expectedFont, chatGUI.outputTextArea.getFont());
     }
+    @Test
+    public void testSendButtonActionPerformed() {
+        chatGUI.inputTextField.setText("Testnachricht");
+        chatGUI.sendButton.doClick();
+
+        String expectedOutput = "Testnachricht\n";
+        assertEquals(expectedOutput, chatGUI.outputTextArea.getText());
+    }
 }