exp. with Foundry recently, and it's cool, but I'm a bit confused as to why testing in Solidity is preferred when it's highly likely interactions w/ your contract will need to use JS/TS anyway.

3P apps call your contract directly via frontend or they have a contract that calls your contract that itself uses a frontend

/bettik founder /outercorps stalwart | ex-binance, ex-celsiusX

wouldn't it be more helpful to everyone to just test in JS/TS so implementation in a frontend is just copy/paste for much of the code?

what am I missing?

Technowatermelon. Elder Millenial. Building Farcaster. 

nf.td/varun

That makes sense, but since the goal of the contract is likely to often be called via a frontend, would it not also be wise to test via that use case? It seems poor practice to neglect an (often primary) interaction.

In the past, my team has just written test contracts to test contract calls anyway, so both are tested

Testing code written in one language using another language is a massive kludge (very rare that this happens, except maybe e2e tests)

You introduce a lot of complexity at the boundary, translating objects from one language to another and back. 

That makes it hard to write good tests.

Working on building zkTLS infra/products. A ruthless empiricist and meme connoisseur.

http://opacity.network

Right, but to be clear on what you're implying - you're saying that if typechain typings are able to be created, data translation is assumed to be accurate?

There are many tools that will generate typescript bindings for a contract based on its ABI.

The graph outputs a interface you can apply to a ethers Contract. I always add a command in package.json to build the contract typings.

I think depending on your contract size and complexity and specialisation. I can imagine for a very large codebase working only in solidity one might want foundry. Myself I am very happy with hardhat as I am full stack. But for solidity only Devs, I can imagine the draw.

Test contract functionality and security in Solidity, test the frontend with js/ts. I’ve done both but once I used Foundry I never wanted to go back to testing my contracts with js