Apply caching behaviour to nargo test

[TomAFrench]

Problem

When iterating on circuits I'd like to be able to quickly check if my changes have broken/fixed any of the tests I have written in Noir.

nargo test however recompiles every test function on each call. This can be very slow in cases where I have many tests which all need to compile significant circuits, even if I haven't changed any of the Noir source code which is relevant to the test in question.

Happy Case

We can then reuse the caching behaviour in #2743 to check if the test has been changed. If so we can re-run the test and display the updated output, otherwise we can reuse the old result.

Alternatives Considered

No response

Additional Context

This is basically a requirement for nargo test --watch functionality.

Would you like to submit a PR for this Issue?

No

Support Needs

No response