remove unnecessary truffle article

Author: corwintines

src/content/developers/docs/smart-contracts/testing/index.md

@@ -283,12 +283,12 @@ The major difference is that bug bounty programs are open to the wider developer
 - **[Diligence Scribble](https://consensys.net/diligence/scribble/)** - _Scribble is a specification language and runtime verification tool that allows you to annotate smart contracts with properties that allow you to automatically test the contracts with tools such as Diligence Fuzzing or MythX._
 
 ## Related tutorials {#related-tutorials}
+
 - [An overview and comparison of different testing products](/developers/tutorials/guide-to-smart-contract-security-tools/) \_
 - [How to use Echidna to test smart contracts](/developers/tutorials/how-to-use-echidna-to-test-smart-contracts/)
 - [How to use Manticore to find smart contract bugs](/developers/tutorials/how-to-use-manticore-to-find-smart-contract-bugs/)
 - [How to use Slither to find smart contract bugs](/developers/tutorials/how-to-use-slither-to-find-smart-contract-bugs/)
 - [How to mock Solidity contracts for testing](/developers/tutorials/how-to-mock-solidity-contracts-for-testing/)
-- [How to migrate from Truffle Tests to OpenZeppelin Test Environment](https://docs.openzeppelin.com/test-environment/0.1/migrating-from-truffle)
 - [How to run unit tests in Solidity using Foundry](https://www.rareskills.io/post/foundry-testing-solidity)
 
 ## Further reading {#further-reading}