Scenario

There are 6 build plans (BP1, BP2, BP3, BP4, BP5 and BP6) and they work on a tree structure respecting the following:

1. BP4, BP5 and BP6 are the input
2. BP1 is the output
3. BP2 cannot be triggered unless BP4, BP5 and BP6 have built successfully and generated their artifatcs, as BP2 will consume the artifatcs generated by BP4, BP5 and BP6.
4. BP3 cannot be triggered unless BP4, BP5 and BP6 have built successfully and generated their artifatcs, as BP3 will consume the artifatcs generated by BP4, BP5 and BP6.
5. BP1 cannot be triggered unless BP2 and BP3 have built successfully and generated their artifatcs, as BP1 will consume the artifatcs generated by BP2 and BP3.
6. Once BP4 gets in the queue, its siblings (BP5 and BP6) should be queued as well.
7. Once BP5 gets in the queue, its siblings (BP4 and BP6) should be queued as well.
8. Once BP6 gets in the queue, its siblings (BP4 and BP5) should be queued as well.