@Test public void shouldManageRelationships() { Bucket packageBucket = new Bucket(javaPackage); Bucket fileBucket = new Bucket(javaFile); fileBucket.setParent(packageBucket); assertThat(fileBucket.getParent(), is(packageBucket)); assertThat(packageBucket.getChildren().size(), is(1)); assertThat(packageBucket.getChildren(), hasItem(fileBucket)); }