类中私有方法的测试

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最新推荐文章于 2022-05-09 19:07:37 发布

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分类专栏： Java语言专题文章标签： null class 测试 exception junit jdbc

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本文介绍了一种使用反射机制测试私有方法的方法。通过获取私有方法的引用并调用它，可以验证其正确性。这种方法适用于JUnit等测试框架。

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在开发项目时常会编写方法的测试，如果为公共方法junit提供测试办法，类中的方法不全为公共方法，若为私有方法怎样测试呢。下面给出私有方法的测试办法。

下面是一个组件类：

public class Component extends DefaultComponent {

    /**
     * 功能描述：获得业务数组

     * @param con
     * @param xzqh
     * @param pcs
     * @param csrq
     * @return
     * @throws Exception
     */
    private int[] getArray(Connection con, ParamObject paramObject) {
        String sql = "select nfpwh,wfpwh from audanum where xzqh=? and pcscod=? and csrq=?";
        PreparedStatement preparedStatement = null;
        ResultSet resultSet = null;
        try {
            preparedStatement = con.prepareStatement(sql);
            preparedStatement.setString(1, paramObject.getXzqh());
            preparedStatement.setString(2, paramObject.getPcscode());
            preparedStatement.setString(3, paramObject.getCsrq());
            resultSet = preparedStatement.executeQuery();
            resultSet.next();
            int[] whArray = { resultSet.getInt("nfpwh01"),
                    resultSet.getInt("wfpwh02") };
            return whArray;
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            if (preparedStatement != null) {
                try {
                    preparedStatement.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
            if (resultSet != null) {
                try {
                    resultSet.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
        }
        return null;
    }
}

测试类如下：

利用类的反射机制，得到类中的方法。

public class ComponentTest extends TestCase ...{
    private final String URL = "jdbc:oracle:thin:@192.10.0.23:1521:orcl";
    private final String USERNAME = "username";
    private final String PASSWORD = "password";
    private Connection connection = null;
    private ParamObject paramObject = null;
    private SfzhComponent comp = null;

    @Override
    protected void setUp() throws Exception ...{
        super.setUp();
        connection = getConnection();
        paramObject = getParamObject();
        comp = new SfzhComponent();
    }

    private Connection getConnection() ...{
        Connection connection = null;
        try ...{
            Class.forName("oracle.jdbc.driver.OracleDriver");
        } catch (ClassNotFoundException e) ...{
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        try ...{
            connection = DriverManager.getConnection(URL, USERNAME, PASSWORD);
        } catch (SQLException e) ...{
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return connection;
    }

    private ParamObject getParamObject() ...{
        ParamObject paramObject = new ParamObject();
        paramObject.setCsrq("20071217");
        paramObject.setPcscode("069");
        paramObject.setPcscodemc("西关派出所");
        paramObject.setXb("1");
        paramObject.setXzqh("610104");
        paramObject.setXzqhmc("陕西省西安市莲湖区");
        return paramObject;
    }

    public void testgetArray() ...{
        try ...{
            Method m = comp.getClass().getDeclaredMethod("getArray",
                    new Class[] ...{ Connection.class, ParamObject.class });
            m.setAccessible(true);
            Object ob = m
                    .invoke(comp, new Object[] ...{ connection, paramObject });
            assertEquals(true, ob != null);
        } catch (Exception e) ...{
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }
}