java - Why is the rule temporary folder not created?

Question

my issue seems to be very similar to "folder has not yet been created" error when using JUnit temporary folder in testclass.
Unfortunately the provided solution does not work for me and I don't know what to do. I want to test the following:

//@RunWith(SpringRunner.class)
@RunWith(PowerMockRunner.class)
@PrepareForTest({SomeClass.class, SomeClassTests.class})
@SpringBootTest
class SomeClassTests {

    @Autowired
    private SomeClass systemUnderTest;
    
    @Rule
    public TemporaryFolder folder = new TemporaryFolder();

    @Test
    void somePrivateMethodShouldDeleteSomeFile() {
        // given
        File foo = null;

        try {
            foo = folder.newFile("foo.java");
        } catch (IOException e) {
            assert false;
        }

        assertThat(foo.exists());

        // when
        try {
            Method privateMethod = SomeClass.class.getDeclaredMethod("somePrivateMethod");
            privateMethod.setAccessible(true);
            privateMethod.invoke(SomeClass.class);
        } catch (Exception e) {
            assert false;
        }

        // then
        assertThat(!foo.exists());
    }

    @TestConfiguration
    static class SomeClassTestsConfiguration {
        @Bean
        public SomeClass systemUnderTest() {
            return new SomeClass();
        }
    }
}

When I execute the entire Test Class as well as when I execute the single test, it always throws the exception in the first try catch block..

java.lang.IllegalStateException: the temporary folder has not yet been created

question from:https://stackoverflow.com/questions/65938167/why-is-the-rule-temporary-folder-not-created

Answer 1

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