Add unit tests and end-to-end tests

[langfield]

The not-so-recent audit of the wallet mentioned there are no tests in this codebase? Is this still the case?

See https://leastauthority.com/blog/audit-of-clorio-wallet-mina-ledger-js-for-mina-foundation/

[nerdvibe]

Hi @langfield , that's correct. There are no unit tests in place at the current time. They are still planned, but they have not been developed yet in favour of user functionalities.

Feel free to get in touch if you want to contribute to do so