Path parent = file.getParent();
    assertFalse(Files.exists(parent));
    assertThrows(IOException.class, () -> MoreFiles.createParentDirectories(file));
  }

  public void testCreateParentDirectories_nonDirectoryParentExists() throws IOException {
    Path parent = createTempFile();
    assertTrue(Files.isRegularFile(parent));
    Path file = parent.resolve("foo");