Fix flaky TransactionTests.testResponseStreamFails() test
#582
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Motivation
EmbeddedEventLoopevent loop is not thread-safe but we create aEventLoopFuturethat is required to be thread-safe from anEmbeddedEventLoop. This leads to undefined behaviour and therefore a flaky test.Modification
This PR replaces the
EventLoopFuturewith a simplePromiseimplementation that uses Swift Concurrency to protect against concurrent access.Result
Before this patch, I could reliably fail the test after ~5K repetitions.
With this patch, I have run the test 100K times without a single failure.
Note: this only effects code in the test target