test_Error message for mismatched passwords

src/test/java/SignUpGUITest.java

@@ -3,9 +3,15 @@ import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeEach;
 
-
+import java.awt.Component;
 import java.awt.event.ActionEvent;
+import javax.swing.*;
+import java.util.ArrayList;
+import java.util.List;
+
 
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
 
 	class SignUpGUITest {
@@ -37,7 +43,34 @@ import java.awt.event.ActionEvent;
 	        signUpGUI.actionPerformed(actionEvent);
 
 	    }
+	    
+	    
 
+	    @Test
+	    void testPasswordMismatch() {
+	        SignUpGUI signUpGUI = new SignUpGUI();
+	        signUpGUI.getUsernameField().setText("testuser");
+	        signUpGUI.getPasswordField().setText("password");
+	        signUpGUI.getConfirmPasswordField().setText("differentpassword");
+	        signUpGUI.getBirthdayField().setText("1990-01-01");
+	        signUpGUI.getFirstNameField().setText("John");
+	        signUpGUI.getSurnameField().setText("Doe");
+
+	        signUpGUI.getSignUpButton().doClick(); // Simulate button click
+
+	        // Make sure an error message dialog is shown
+	        assertTrue(isErrorMessageShown(signUpGUI));
+	    }
 	    
+	 // Helper method to check if an error message dialog is shown
+	    private boolean isErrorMessageShown(JFrame frame) {
+	        Component[] components = frame.getComponents();
+	        for (Component component : components) {
+	            if (component instanceof JOptionPane) {
+	                return false;
+	            }
+	        }
+	        return true;
+	    }
 
 }