dubzn

Install Hardhat and run all tests:
npm add --save-dev hardhat
yarn install // Delete yarn.lock if an error occurs
yarn run test

For specific file:
yarn test ./test/SwapMath.spec.ts

sources: 
- https://docs.uniswap.org/contracts/v3/guides/local-environment

dubzn

// Test to evaluate rounding behavior and zeros
#[test]
fn test_division_round_with_negative_result() {
    // -10/ 3 = 0   
    let a = IntegerTrait::<i256>::new(10, true);
    let b = IntegerTrait::<i256>::new(3, false);
    let (q, r) = a.div_rem(b);
    assert(q.mag == 3 && r.mag == 1, '-10 / 3 = (-3, -1)'); // should be (-3, 1)?
    assert(q.sign == true && r.sign == true, '(neg, neg)');