perf: added evm_snapshot in order to avoid deploying on beforeEach #621
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Description
The contracts tests take several minutes to run. This PR tries to tackle a low hanging fruit that helps improving such time.
Proposed solution
In order to speed up the tests I've replaced several contracts deployment executions that were ran before each test by
buidlervm
evm_snapshot
feature (it works on ganache as well).At least on GH actions is taking
~25m
instead of the~35-40m
seen on the main repo, leading to a 30% reduction