[Solved] I was wondering how to test the contracts that draw functions from interfaces in uniswap v3 periphery

alex234 Asks: I was wondering how to test the contracts that draw functions from interfaces in uniswap v3 periphery
It seems like there is one large contract inheriting interfaces but the code is written like there is a contract instance out there? I don’t really understand. Theoretically it should work however a contract I tested gave an error stating that the contract cannot call a function from a non-contract amount?

Code:
import '@uniswap/v3-periphery/contracts/interfaces/ISwapRouter.sol';

contract MyContract {
  ISwapRouter router;

  function doSomethingWithSwapRouter() {
    // router.exactInput(...);
  }
}

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