使用powerMock和mockito模拟静态方法和私有方法

首先我们要导入相应的包

<dependency>  
    <groupId>org.powermock</groupId>  
    <artifactId>powermock-api-mockito</artifactId>  
    <version>1.4.12</version>  
    <scope>test</scope>  
</dependency> 

<dependency>  
    <groupId>org.mockito</groupId>  
    <artifactId>mockito-all</artifactId>  
    <version>1.8.5</version>  
    <scope>test</scope>  
</dependency>  

<dependency>  
    <groupId>org.powermock</groupId>  
    <artifactId>powermock-module-junit4</artifactId>  
    <version>1.4.12</version>  
    <scope>test</scope>  
</dependency>

被测试类

    public static boolean webchatEnable(String language){
        ....
    }

    public static String getWebChatPages(String language){
        ....
    }

    private static boolean webchatInHours(){
        ....
    }

    private static boolean webchatLanguageEnable(String language){
        ...
    }

    private static Calendar getCurrentTime(){
        return Calendar.getInstance();
    }

测试类

    @RunWith(PowerMockRunner.class)  //1
    @PrepareForTest({PropertyApplicationContext.class,WebChatUtil.class}) //2
    public class WebChatUtilTestCase extends AbstractJUnit {

    @Before
    public void init(){
        PowerMockito.mockStatic(PropertyApplicationContext.class);// 3
        PowerMockito.mockStatic(WebChatUtil.class);
    }

    @Test
    public void testWebchatEnable(){
        try {
            Calendar c = Calendar.getInstance();
            c.set(c.get(Calendar.YEAR), c.get(Calendar.MONTH), c.get(Calendar.DATE), 16, 35);
            PowerMockito.spy(WebChatUtil.class); // 创建spy,如果不创建的话，后面调用WebChatUtil就都是Mock类，这里创建了spy后，只有设置了mock的方法才会调用mock行为
            PowerMockito.doReturn(c).when(WebChatUtil.class, "getCurrentTime"); //Mock私有方法
        } catch (Exception e) {
            e.printStackTrace();
        }
        PowerMockito.when(PropertyApplicationContext.getProperty(PropertyConstants.WEBCHAT_HOURS)).thenReturn("0900,1800"); //4 - Mock静态方法，返回期望值
        PowerMockito.when(PropertyApplicationContext.getProperty(PropertyConstants.WEBCHAT_LOCALES)).thenReturn("en,sc,cn");

        Assert.assertTrue(WebChatUtil.webchatEnable("en"));

        PowerMockito.when(PropertyApplicationContext.getProperty(PropertyConstants.WEBCHAT_HOURS)).thenReturn("090,1800");
        PowerMockito.when(PropertyApplicationContext.getProperty(PropertyConstants.WEBCHAT_LOCALES)).thenReturn("en,sc,cn");
        Assert.assertFalse(WebChatUtil.webchatEnable("en"));

        PowerMockito.when(PropertyApplicationContext.getProperty(PropertyConstants.WEBCHAT_HOURS)).thenReturn("0900,1800");
        PowerMockito.when(PropertyApplicationContext.getProperty(PropertyConstants.WEBCHAT_LOCALES)).thenReturn("en,sc,cn");
        Assert.assertFalse(WebChatUtil.webchatEnable("th"));
    }

        ① 标注使用PowerRunner运行test（powermock会修改字节码）

② 设置mock类（支持多个类，逗号分隔），这个可以设置到class上，也可以设置到method上。这里面包含两种类型： 

            被mock的类（如上例MyStringUtil .class，如果mock类为系统类，如System.class，则不需要这里设置就可以使用）

            context类，如果是在XxxServer里面希望mock MyStringUtil类，则要设置 XxxServer.class

③ 告诉powermock需要mock哪个类。（感觉这里配置和②有点重合）

④ 打桩，设置mock对象返回预期值。（测试mock方法还未执行）