add tests describing the behavior of set_element_hierarchy #14843

Job	Run time
check-deps (3.9)	1m 46s
check-extras (3.9)	30s
check-deps (3.10)	1m 36s
changelog	6s
check-extras (3.10)	21s
check-deps (3.11)	1m 27s
check-extras (3.11)	22s
check-deps (3.12)	1m 39s
check-licenses (3.12)	6m 34s
check-extras (3.12)	26s
setup (3.9)	6s
shellcheck	8s
setup (3.10)	4s
shfmt	35s
setup (3.11)	6s
setup (3.12)	5s
lint (3.9)	1m 25s
setup_ingest (3.9)	5s
lint (3.10)	1m 25s
lint (3.11)	1m 45s
setup_ingest (3.10)	4s
test_unit_no_extras (3.10)	1m 27s
test_unit (3.9)	4m 19s
test_unit (3.10)	4m 19s
test_unit (3.11)	4m 18s
test_unit (3.12)	4m 19s
test_chipper (3.10)	4m 19s
test_ingest_dest (3.9)	4m 12s
test_ingest_dest (3.10)	4m 12s
test_ingest_help (3.9)	4m 17s
test_ingest_help (3.10)	4m 20s
test_ingest_help (3.11)	4m 17s
test_ingest_src (3.9)	4m 13s
test_ingest_help (3.12)	4m 17s
test_ingest_src (3.10)	4m 13s
test_ingest_unit (3.9)	3m 59s
test_ingest_unit (3.10)	3m 54s
test_dockerfile	4m 14s
test_unstructured_api_unit (3.10)	31s
test_unit_dependency_extras (3.10, csv)	2m 7s
test_unit_dependency_extras (3.10, docx)	2m 20s
test_unit_dependency_extras (3.10, odt)	2m 27s
test_unit_dependency_extras (3.10, markdown)	1m 56s
test_unit_dependency_extras (3.10, pypandoc)	2m 20s
test_unit_dependency_extras (3.10, pdf-image)	2m 46s
test_unit_dependency_extras (3.10, pptx)	2m 10s
test_unit_dependency_extras (3.10, xlsx)	1m 55s
	1h 48m 16s

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