Resolve "Inhibition reactions not preserved when converting from CellDesigner to SBML"

changed milestone to %v12.2.0~beta.0

added 6 commits

f80bfab8 - Mockito used for creation of mock instances
80dea442 - runtime mock reaction objects instead of creating new classes
de73de88 - problem with ids ending with "__"
2d090b19 - output shouldn't be assigned unless we do it for every input/output operator
3e2f8826 - proper operator types for specific reaction types
eb97d7f5 - export of reaction contains information about arrow types and line types

unmarked as a Work In Progress

enabled an automatic merge when the pipeline for eb97d7f5 succeeds

mentioned in commit f81204f8

merged

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