Powermockito - 模拟文件返回 null

如何解决Powermockito - 模拟文件返回 null

我可以知道以下使用 PowerMock 编写的测试用例有什么问题吗？

这里是被测试的方法：

public final Class ChecksConfig {

protected static Map<String,Object> getConfig() {
 return getAppConfig()
}

private static Map<String,String> getAppConfig() {
  File[] files = new File("/home/").listFiles();
  if (null == files) {
    return Collections.emptyMap();
  }
  return getConfigKeyMap(files); //Test does not reach this line as the IF condition is true. 
// But this code need to be covered
}

}

我相信这是因为 file[] 显示为 null 并且没有正确模拟。我可以知道我在下面的测试方法中做错了什么吗？

@RunWith(powermockrunner.class)
@PrepareForTest(ChecksConfig.class)
public class ChecksConfigTest {

@InjectMocks
ChecksConfig checksConfig;

@Rule
private TemporaryFolder folder = new TemporaryFolder();

@Test
public void testGetCheck() throws Exception {
  
  powermockito.mockStatic(ChecksConfig.class);
  File f = folder.newFile();
  File[] files = { f };
  File file = powermockito.mock(File.class);
  powermockito.whenNew(File.class).withAnyArguments().thenReturn(file);
  powermockito.when(file.listFiles()).thenReturn(files);
  powermockito.when(file.isFile()).thenReturn(true);
  powermockito.when(checksConfig.getConfig()).thenReturn(map);
}