Trace to test converter

Turn a failing fuzzer trace into a Foundry test that reproduces it.

Runs in your browser

Failing trace

Paste the call sequence the fuzzer printed when it broke a property.

Contract name

Used for the commented-out import and deployment.

Test function name

Forge only runs functions whose name starts with test.

Fuzzer call trace

Echidna's text output or Medusa's JSON — both are recognised automatically.

No test yet

Paste a trace and you get a Foundry test that replays the same calls, in the same order, from the same senders.

Both are tried in turn — Echidna's line format first, then Medusa's JSON.

Echidna text format

function(arg1, arg2) from: 0x...
deposit(1000) from: 0x10000
withdraw(500) from: 0x10000

Medusa JSON format

{
  "calls": [
    {"function": "deposit", "args": ["1000"], "from": "0x..."},
    {"function": "withdraw", "args": ["500"], "from": "0x..."}
  ]
}

After generating the test