public String getLoadingSectionTag() {
        return LOADING_SECTION_TAG;
    }
Four sections in the adapter:
<p>
1 - visible section, not headed, not footed in LOADING state
2 - invisible section, not headed, not footed, with 10 items
3 - visible section, headed and footed in FAILED state
4 - visible section, headed and footed in EMPTY state
<p>
Sections number 1, 3 and 4 are the sections under test.
library/src/test/java/io/github/luizgrp/sectionedrecyclerviewadapter/tools/Scenario4.java