单元测试Java Servlet

@WebServlet(name = "MyServlet", urlPatterns = {"/myServlet"})
public class MyServlet extends HttpServlet {
    
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.getWriter().print("Hello, world!");
    }
}

import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.TestTemplate;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;

import javax.servlet.ServletException;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import java.io.IOException;

public class MyServletTest {
    private HttpServlet servlet;
    private MyServletTest client;

    @BeforeEach
    void setUp() {
        servlet = new MyServlet();
        client = spy(servlet);
    }

    @AfterEach
    void tearDown() {
        servlet = null;
        client = null;
    }

    @TestTemplate
    @Test
    public void testGet() throws ServletException {
        HttpServletRequest req = mock(HttpServletRequest.class);
        HttpServletResponse resp = mock(HttpServletResponse.class);

        // 设置请求处理过程中的响应
        when(req.getMethod()).thenReturn("GET");
        when(req.getRequestURI()).thenReturn("/myServlet");
        when(req.getServletPath()).thenReturn("/myServlet");

        // 模拟请求的发送和读取响应
        when(resp.getOutputStream()).thenReturn(null);
        when(resp.getWriter()).thenReturn(null);

        // 调用实际处理方法
        MyServlet.handleRequest(req, resp);

        // 检查实际的请求处理功能是否符合预期
        resp.getWriter().write("Hello, world!");
        byte[] bytes = resp.getBytes();
        assertThat(bytes).isEqualTo(new byte[]{0x48, 0x65, 0x6c, 0x6c, 0x6f, 0x00});
    }

    @TestTemplate
    @Test
    public void testPost() throws ServletException {
        HttpServletRequest req = mock(HttpServletRequest.class);
        HttpServletResponse resp = mock(HttpServletResponse.class);

        // 设置请求
        // ...

        // 模拟请求的发送和读取响应
        when(resp.getOutputStream()).thenReturn(null);
        when(resp.getWriter()).thenReturn(null);

        // 调用实际处理方法
        MyServlet.handleRequest(req, resp);

        // 检查实际的请求处理功能是否符合预期
        resp.getWriter().write("Hello, world!");

        byte[] bytes = resp.getBytes();
        assertThat(bytes).isEqualTo(new byte[]{0x48, 0x65, 0x6c, 0x6c, 0x6f, 0x00});
    }

    // 类似的测试用例可以添加更多的功能操作
    
    // ...

}