test_a
Highest level artefact A.
_Test
test_b
Highest level artefact b.
test_c
Mid-level artefact C. Inherited (included): Highest level artefact A. Highest level artefact b.
test_d
Low-level artefact D. Inherited (included): Mid-level artefact C. Inherited (included): Highest level artefact A. Highest level artefact b.