Powermockito:截取所有静态方法

Question

此代码模拟类中的静态void方法并覆盖其行为。(摘自此问题here)

@RunWith(PowerMockRunner.class)
@PrepareForTest({Resource.class})
public class MockingTest{

    @Test
    public void shouldMockVoidStaticMethod() throws Exception {
        PowerMockito.spy(Resource.class);
        PowerMockito.doNothing().when(Resource.class, "readResources", Mockito.any(String.class));

        //no exception heeeeere!
        Resource.readResources("whatever");

        PowerMockito.verifyStatic();
        Resource.readResources("whatever");
    }
}

class Resource {
    public static void readResources(String someArgument) {
        throw new UnsupportedOperationException("meh!");
    }
    public static void read(String someArgument) {
        throw new UnsupportedOperationException("meh!");
    }
}

如何拦截所有方法调用，而不是单独指定方法？

它尝试了PowerMockito.doNothing().when(Resource.class)和PowerMockito.doNothing().when(Resource.class, Matchers.anything())，但这些都不起作用。

Answer 1

这一点：

PowerMockito.doNothing().when(Resource.class, Matchers.anything())

不起作用，因为Matchers.anything()为Object创建了一个匹配器，而上面的when()正在尝试根据类型查找方法。尝试传递Matchers.any(String.class)。这只适用于具有相同参数列表的静态方法。不确定是否有更通用的覆盖方法。

Answer 2

如果你想模拟一个类的所有静态方法，我认为你可以用PowerMockito.mockStatic(..)代替PowerMockito.spy(..)

   @Test
   public void shouldMockVoidStaticMethod() throws Exception {
      PowerMockito.mockStatic(Resource.class);

      //no exception heeeeere!
      Resource.readResources("whatever");

      PowerMockito.verifyStatic();
      Resource.readResources("whatever");
   }

希望能对你有所帮助。