AssertJ Swing GUI测试配置报错：FrameFixture构造方法无法解析

问题原因 #

• FrameFixture是Swing GUI测试框架（AssertJ Swing/旧版FEST Swing）提供的工具类，它的构造方法仅接收java.awt.Window及其子类（比如JFrame）作为入参
• 你当前的Login类没有继承JFrame，只是在内部封装了一个public JFrame frame成员变量，直接传Login实例会报构造方法不匹配的错误
• 不需要强行继承SampleFrame，这个类不是Swing GUI测试的必需依赖，属于走偏的解决思路

修复方案 #

方案1：调整Login类继承结构（推荐） #

直接让Login继承JFrame，不需要额外维护单独的frame成员，修改后代码如下：

package GUI;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPasswordField;
import java.awt.Font;
import javax.swing.JTextField;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;

// 直接继承JFrame
public class Login extends JFrame{

    private JTextField textField;
    private JPasswordField textField_1;

    public Login() {
        initialize();
    }

    private void initialize() {
        // 原来的frame变量替换成this即可
        this.setBounds(100, 100, 450, 300);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setTitle("Banking System");
        this.getContentPane().setLayout(null);
        
        JLabel label = new JLabel("Banking System");
        label.setFont(new Font("Tahoma", Font.BOLD, 17));
        label.setBounds(147, 11, 151, 41);
        this.getContentPane().add(label);
        
        JLabel lblLoginScreen = new JLabel("Login Screen");
        lblLoginScreen.setFont(new Font("Tahoma", Font.PLAIN, 13));
        lblLoginScreen.setBounds(170, 63, 101, 23);
        this.getContentPane().add(lblLoginScreen);
        
        JLabel lblUsername = new JLabel("Username:");
        lblUsername.setFont(new Font("Tahoma", Font.PLAIN, 12));
        lblUsername.setBounds(55, 119, 64, 23);
        this.getContentPane().add(lblUsername);
        
        JLabel lblPassword = new JLabel("Password:");
        lblPassword.setFont(new Font("Tahoma", Font.PLAIN, 12));
        lblPassword.setBounds(55, 159, 64, 23);
        this.getContentPane().add(lblPassword);
        
        textField = new JTextField();
        textField.setBounds(130, 121, 86, 20);
        this.getContentPane().add(textField);
        textField.setColumns(10);
        textField.setText("admin");
        
        textField_1 = new JPasswordField();
        textField_1.setBounds(130, 161, 86, 20);
        this.getContentPane().add(textField_1);
        textField_1.setColumns(10);
        
        JButton btnLogin = new JButton("Login");
        btnLogin.addActionListener(new ActionListener() {
            @SuppressWarnings("deprecation")
            public void actionPerformed(ActionEvent e) {
                String user,pass;
                textField.setText("admin");
                user="admin";
                pass=textField_1.getText();
                if((user.equals("admin")&&(pass.equals("admin"))))
                        {
                            JOptionPane.showMessageDialog(getComponent(0), "Login Successfully");
                            setVisible(false);
                            
                            GUIForm.menu.setVisible(true);
                            
                        }
                else
                {
                    JOptionPane.showMessageDialog(getComponent(0), "Login Failed");
                }
            }
        });
        btnLogin.setBounds(260, 138, 89, 23);
        this.getContentPane().add(btnLogin);
    }
}

修改后原有TestLogin代码无需改动即可正常运行。

方案2：不修改Login类，直接传入内部的frame成员 #

如果不想改动现有Login类的结构，仅修改TestLogin的初始化代码即可：

@Before
public void setUp() {
    Login login = GuiActionRunner.execute(() -> new Login());
    // 直接传入Login类里封装的JFrame成员
    window = new FrameFixture(login.frame);
    window.show();
}

依赖补充 #

如果IntelliJ仍然提示FrameFixture类找不到，确认你已引入AssertJ Swing的测试依赖，Maven配置参考如下：

<dependency>
    <groupId>org.assertj</groupId>
    <artifactId>assertj-swing-junit</artifactId>
    <version>3.17.1</version>
    <scope>test</scope>
</dependency>

内容的提问来源于stack exchange，提问作者Programmer2B