利用EasyMock生成数据库连接简单测试示例

package demo.mock;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class LoginAction{

    public String login(Connection conn, String name, int pas) {

        PreparedStatement pst = null;
        ResultSet rs = null;

        try {
            String sql = "select * from user where name = ? and pas = ?";
            pst = conn.prepareStatement(sql);
            pst.setString(1, name);
            pst.setInt(2, pas);
            rs = pst.executeQuery();

            if(rs.next()) {
                return "登陆成功。";
            } else {
                return "登陆失败。";
            }

        }catch(SQLException e) {
            e.printStackTrace();
            return "抛出异常。";
        } finally {
            try {
                rs.close();
                pst.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }

}

package demo.mock;

import static org.easymock.EasyMock.createControl;
import static org.easymock.EasyMock.expect;
import static org.junit.Assert.assertEquals;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import org.easymock.IMocksControl;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

public class LoginActionTest {

    private LoginAction login;

    @Before
    public void init() {
        login = new LoginAction();
    }

    @After
    public void destory() {
        login = null;
    }

    @Test
    public void login() throws SQLException{
        String name = "admin";
        int pas = 123;

        //创建Mock对象
        IMocksControl control = createControl(); //创建多个Mock对象时通过IMocksControl管理

        Connection conn = control.createMock(Connection.class);
        PreparedStatement pst = control.createMock(PreparedStatement.class);
        ResultSet rs = control.createMock(ResultSet.class);

        // 录制信息，即设定Mock对象的预期行为和输出
        // 所有Mock对象需要执行的方法都必须录制，如pst.setInt(2, pas)、rs.close()等
        String sql = "select * from user where name = ? and pas = ?";
        expect(conn.prepareStatement(sql)).andReturn(pst).times(1);     

        pst.setString(1, name);
        pst.setInt(2, pas);

        expect(pst.executeQuery()).andReturn(rs);
        expect(rs.next()).andReturn(true);

        rs.close();
        pst.close();

        //录制完成，切换replay状态
        control.replay();

        //调用实际的方法
        String res = login.login(conn, name, pas);
        String expected = "登陆成功。";
        assertEquals(expected, res);

        //验证
        control.verify();

    }

}