Ganache-cli: evm_revert also deletes the saved snapshot

[zweicoder]

Currently evm_revert seems to delete the saved snapshot itself, which might not be the desirable behavior.

I'm calling evm_snapshot after revert every time for it to work properly.

Edit: The revert stops working after reverting a few times

[tcoulter]

This is the expected behavior. Consider a snapshot "used up" once you've reverted to that state.

[sim-sliver]

Ran into this issue today until I saw this thread.

I was using truffle to test against a contract. Because of test scripts have dependency, I implemented a manual snapshot - revert workflow to reset to previous state.

Little did I know a reverted snapshot is 'used up', plus truffle secretly utilize and generate new snapshots when running tests, my manually saved snapshot is overwritten by tuffle silently and caused lots of confusion.

[d10r]

If this is expected behaviour, it should at least be documented (one sentence more in the Readme would do the job) as that's not how snapshot semantics usually work.