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Ethereum smart contract fuzzer

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Would make it 100x easier to debug "crashes". Not sure how hard this is

This small PR is testing to enable the `setUp()` for every type of test (not only dapptools). It will be always executed, if available if it will still be part...

**Use case** This use case is inspired by Damn Vulnerable DeFi - Unstoppable. https://www.damnvulnerabledefi.xyz/challenges/1.html There are 3 users: - Admin. Deploys contracts, is owner, etc. - User. Uses the contracts,...

In the current coverage report, we don't know exactly the execution reverts ``` *r | function f(int val) public { *r | require (val % 100 > 0); *r |...

Example: https://github.com/superfluid-finance/protocol-monorepo/tree/echidna_fuzzing_integration/packages/ethereum-contracts After `yarn install` under the root folder, openzepplin is under the root folder node_modules: ``` $ ls -ld node_modules/\@openzeppelin drwxrwxr-x 5 hellwolf hellwolf 4096 Mar 15 17:56 node_modules/@openzeppelin...

An experiment after a discussion with @agroce.

This PR allows to use the FFI cheatcode from HEVM in Echidna if the `allowFFI: true` is used in the configuration yaml. This is disabled by default.

By default HEVM creates a VM where `vmoptAllowFFI` is set to false: https://github.com/dapphub/dapptools/blob/a2b96cc2dbc28508c9fe699d6438bf6eccafc2ad/src/hevm/src/EVM/Exec.hs#L21-L46 We can add a flag in Echidna to set this to true (or just always enable it...

high-priority

I’m trying to understand and use `multi-abi` feature. Starting from the [example](https://github.com/crytic/echidna/blob/1af7989379f3d91922bb93924db996754a61b8f5/examples/solidity/basic/multi-abi.sol), I modify it to look like: ``` contract A{ bool public bug = true; function trigger_bug() public{ assert(false);...

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