diff --git a/foundry/README.md b/foundry/README.md
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+## foundry and tests in solidity
+
+<br>
+
+
+### tl; dr
+
+
+<br>
+
+* foundry is a set of tools for ethereum applications development, including tests in solidity
+
+
+<br>
+
+
+
+---
+
+### resources
+
+<br>
+
+* [how to mock solidity contracts](https://ethereum.org/en/developers/tutorials/how-to-mock-solidity-contracts-for-testing/)
+* [truffle smart contract test framework](https://ethereum.org/en/developers/tutorials/how-to-mock-solidity-contracts-for-testing/)
+* [in-depth guide to testing ethereum smart contracts](https://iamdefinitelyahuman.medium.com/an-in-depth-guide-to-testing-ethereum-smart-contracts-2e41b2770297)
+* [how to test smart contracts](https://betterprogramming.pub/how-to-test-ethereum-smart-contracts-35abc8fa199d)
+* [foundry book](https://book.getfoundry.sh/forge/differential-ffi-testing)
+
+
diff --git a/tests/README.md b/tests/README.md
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-## tests in solidity
-
-<br>
-
-#### assert vs. require
-
-* Assert() should only be used to test for internal errors, and to check invariants.
-* Require() should be used to ensure valid conditions are met that cannot be detected until execution time.
-* You may optionally provide a message for require, but not for assert.
-
-<br>
-
-#### unit testing
-
-
-* [Solidity-Coverage](https://github.com/sc-forks/solidity-coverage)
-* [Remix tests](https://github.com/ethereum/remix-project/tree/master/libs/remix-tests)
-* [OpenZeppelin test helpers](https://github.com/OpenZeppelin/openzeppelin-test-helpers)
-* [foundry forge tests](https://github.com/foundry-rs/foundry/tree/master/forge)
-* [etheno](https://github.com/crytic/etheno)
-
-
-
-<br>
-
----
-
-### resources
-
-<br>
-
-* [how to mock solidity contracts](https://ethereum.org/en/developers/tutorials/how-to-mock-solidity-contracts-for-testing/)
-* [truffle smart contract test framework](https://ethereum.org/en/developers/tutorials/how-to-mock-solidity-contracts-for-testing/)
-* [in-depth guide to testing ethereum smart contracts](https://iamdefinitelyahuman.medium.com/an-in-depth-guide-to-testing-ethereum-smart-contracts-2e41b2770297)
-* [how to test smart contracts](https://betterprogramming.pub/how-to-test-ethereum-smart-contracts-35abc8fa199d)