@TagThatIsNotVisibleInNavigation
    @AnotherExampleSubCategory
    @Test
    public void parent_tags_can_have_values() {
        given().tags_annotated_with_tags_that_have_values();
        when().the_report_is_generated();
        then().the_tags_appear_in_a_hierarchy();
    }
This example shows how hierarchical tags work.
<p>
Hierarchical tags can be created by just annotating a tag annotation with another tag.
The other tag becomes a parent tag or category tag. This makes it possible to structure
tags hierarchically. It is even possible to form multiple hierarchies/categories so that a
tag is contained multiple categories.
</p>
jgiven-examples/src/test/java/com/tngtech/jgiven/examples/tags/TagHierarchyExampleTest.java