@Test
  public void testUnlink() {
    assertThat(root.get(Name.simple("foo"))).isNotNull();

    root.unlink(Name.simple("foo"));

    assertThat(root.get(Name.simple("foo"))).isNull();
  }
Tests for {@link Directory}.

@author Colin Decker
jimfs/src/test/java/com/google/common/jimfs/DirectoryTest.java