Integration tests: invariants

[ ] Token price x token supply for each tranche = NAV
[ ] NAV = sum of present value of each asset + total reserve
[ ] Portfolio value + offchain cash value + total reserve = NAV
[ ] Realized profit + unrealized profit + interest payments + unscheduled payments - writeoffs - accrued fees - charged fees + investments - redemptions = NAV delta in period
[ ] (Off chain cash value + total reserve) change in period = - borrows + repayments + investments - redemptions - paid fees

centrifuge / pools-subql