Cleanup system-level tests

[abailly]

The problem that you wish to solve

There are currently 2 set of system-level tests within the cardano-wallet: one in Ruby and one in Haskell.

• Those tests are overlapping, testing the c-w through its API and requiring a somewhat involved setup to run
• They are complex and take a while to run which means they don't provide feedback to new developments fast enough to avoid delay and rework
• The Ruby test suite is unmaintained and no one in the current team of maintainers has the skill nor the will to take that over
• While e2e tests are generally easier to write, they are a liability to maintain as they accumulate over time and do not provide good support for modular code (see Test pyramid metaphor)

Description

This is a significant effort that will take some time, so this should be tackled piecemeal, a few tests at a time:

• List existing tests in both technologies
• Identify redundant and/or obsolete tests in the Ruby e2e suite and remove them
• Identify gaps, ie. tests in Ruby e2e suite that are not in some ways covered by the Haskell integration tests
• Port missing tests to Haskell
• Identify Haskell integration tests that could be unit/component level tests
• Port those tests to a lower-level

Implementation suggestions

No response