Investigate improving test_transport_works

[linear]

[opened by @szokeasaurusrex]

There are multiple problems with this test:

• The test is flaky (specifically on Python 3.10)
  • The flakes appear related to asserting that stdout and stderr is empty
• The test appears to be checking multiple things. It is unclear which of these is important
  • e.g. maybe we should not assert anything about stdout and stderr
• The test is generally difficult to understand
• The test takes a very long time to run because it is parameterized with many different combinations and all the tests are forked
  • Maybe we can reduce the combinations we check and stop forking the test