using @Rule TemporaryFolder inside @Before

I’m explaining the issue with a unit test:

public class TemporaryFolderTest {

@Rule
public TemporaryFolder temporaryFolder = new TemporaryFolder();

@Before
public void before(){
    System.out.println(temporaryFolder.getRoot());
    // fails
    // assertNotNull(temporaryFolder.getRoot());
}

@Test
public void testTempFolder(){
    System.out.println(temporaryFolder.getRoot());
    assertNotNull(temporaryFolder.getRoot());
}

}

[kcooney]

@lucasvc your problem appears to be https://github.com/powermock/powermock/issues/427 which is apparently fixed by https://github.com/powermock/powermock/pull/606

Alternatively use https://github.com/powermock/powermock/wiki/PowerMockRule

[lucasvc]

@kcooney really thanks for the links!