连接客户端：

package newpackage.db;

import java.sql.Connection;
import java.util.logging.Level;
import java.util.logging.Logger;

public class sqlConnection {
    private Connection con;
    private String name;
    private String url;
    private String password;
    private String driver;

    public sqlConnection() {
        this.name = "root";
        this.password = "12345";
        this.url = "";
        this.driver = "com.MysqL.jdbc.Driver";
    }

    public Connection getConnection() {
        try {
            Class.forName(driver);
        } catch (ClassNotFoundException ex) {
            Logger.getLogger(sqlConnection.class.getName()).log(Level.SEVERE,null,ex);
        }

        return null;
    }
}

测试用例：

public void testDriverManager() {
    sqlConnection conClient = new sqlConnection();
    assertEquals(conClient.getConnection(),...);
    or
    assertTrue(conClient.getConnection(),...);
}