模拟系统类以获取系统属性 [英] Mock System class to get system properties

问题描述

我通过 Eclipse 中的 JVM 参数在系统变量中设置了一个文件夹路径，我试图在我的类中访问它:System.getProperty("my_files_path").

I have a folder path set in system variable through JVM arguments in Eclipse and I am trying to access it in my class as: System.getProperty("my_files_path").

在为此类编写 junit 测试方法时，我尝试模拟此调用，因为测试类不考虑 JVM 参数.我使用 PowerMockito 模拟静态 System 类，并尝试在调用 System.getProperpty 时返回一些路径.

While writing junit test method for this class, I tried mocking this call as test classes do not consider JVM arguments. I have used PowerMockito to mock static System class and tried returning some path when System.getProperpty is being called.

在类级别有 @RunWith(PowerMockRunner.class) 和 @PrepareForTest(System.class) 注释.但是， System 类没有被嘲笑，因此我总是得到空结果.任何帮助表示赞赏.

Had @RunWith(PowerMockRunner.class) and @PrepareForTest(System.class) annotations at class level. However, System class is not getting mocked as a result I always get null result. Any help is appreciated.

推荐答案

感谢 Satish.除了稍作修改外，此方法有效.我写了 PrepareForTest(PathFinder.class)，为测试用例而不是 System.class 准备我正在测试的类

Thanks Satish. This works except with a small modification. I wrote PrepareForTest(PathFinder.class), preparing the class I am testing for test cases instead of System.class

另外，由于模拟只工作一次，我在模拟后立即调用了我的方法.我的代码仅供参考:

Also, as mock works only once, I called my method right after mocking. My code just for reference:

@RunWith(PowerMockRunner.class)
@PrepareForTest(PathInformation.class)
public class PathInformationTest {

    private PathFinder pathFinder = new PathFinder();

@Test
    public void testValidHTMLFilePath() { 
        PowerMockito.mockStatic(System.class);
        PowerMockito.when(System.getProperty("my_files_path")).thenReturn("abc");
        assertEquals("abc",pathFinder.getHtmlFolderPath());
    }
}

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