CaptureLogsForTest adds a logging listener which captures messages to an internal channel.

EnableStdoutLogging turns on logging to stdout for diagnostics.

NewContextWithTimeoutForTests creates a context with a lower timeout than requested just to keep unit test times reasonable.

RandomString generates a random string with prefix.

RequireContextHasDefaultTimeout checks that the context has a deadline set, and that it's using the right timeout.

Cancelled matches context.Context instances that are cancelled.

CancelledAndHasTimeout matches context.Context instances that are cancelled AND were also created from NewContextForTest.

NotCancelled matches context.Context instances that are not cancelled.

NotCancelledAndHasTimeout matches context.Context instances that are not cancelled AND were also created from NewContextForTest.