recipe2plan: Added test to have confidence in particle generation order (#4986)
recipe2plan: Added test to have confidence in particle generation order (#4986)

## Changelog

* Added test to ensure particle generation order

* fix lint

Co-authored-by: Alex Rosengarten <7f53ebb9ae575dfae4c3877b459464b8c65a2dfc@google.com>
PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs