Self contained tests for each contract

[KohliSuraj]

Currently the deployment script uses basic 'assert' statements to validate certain conditions while deploying.

We'll have to write proper unit tests for each solidity contract (especially the ones which are not from openzeppelin), to test the external smart contract API calls (i.e. public functions) as well as have some integration tests to validate certain scenarios for Sumero V1.

Example:

ClayBonds.sol
Unit Tests

• Test issue() function
• Test CLAY balance of Clay Bonds contract
• Test zCLAY balance of user issuing
• Test claim() function after maturity

Integration Test Example

• User swaps USDC for CLAY using 'Trade' Tab

• User deposits CLAY to issue a zCLAY Bond

• User mints new synthetic asset using 'Mint' Tab

• User increases the collaterization ratio on the EMP

• User swaps USDC for CLAY using 'Trade' Tab

• User provides liquidity to the USDC-CLAY pool and gets LP tokens in return