It sounds like you're facing one of two problems - either you're using a local dev chain and haven't deployed a Uniswap to it, or you're using a testing fork of a chain, and haven't told your test suite where to lookf for it. You probably have code in your tests for deploying the notSafeMoon contracts using something like const tokenArtifacts = await ethers....


An Ethereum account is a cryptographically secure random 256-bit integer, also known as a private key in public key cryptography. Wallets are just a collection of accounts. A good learning material inner working for Ethereum accounts is the source code of eth_account Python package.

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