Mock System类获取系统属性 [英] Mock System class to get system properties

问题描述

我有一个通过Eclipse中的JVM参数在系统变量中设置的文件夹路径，我试图在我的类中访问它：
System.getProperty（my_files_path）。

在为该类编写junit测试方法时，我尝试嘲笑此调用，因为测试类不考虑JVM参数。我使用PowerMockito来模拟静态系统类，并尝试在 System.getProperpty 被调用时返回一些路径。

在类级别有 @RunWith（PowerMockRunner.class）和 @PrepareForTest（System.class）注释。但是，系统类没有被嘲笑，所以我总是得到空的结果。
任何帮助不胜感激。

解决方案

谢谢Satish。除了进行小的修改之外，它的工作。我写了PrepareForTest（PathFinder.class），准备我正在测试测试用例而不是System.class的类

另外，由于mock只有一次，我打电话给我的方法嘲笑之后。
我的代码仅供参考：

  @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（））; 
} 
} 
  

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").

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.

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.

解决方案

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

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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