Asserts that after the given code block is ran, no stages are left over that were created by the given materializer with an overridden duration that ignores stream.testkit.all-stages-stopped-timeout.
Asserts that after the given code block is ran, no stages are left over that were created by the given materializer with an overridden duration that ignores stream.testkit.all-stages-stopped-timeout.
This assertion is useful to check that all of the stages have terminated successfully.