In a unit test I am checking that a core async channel is empty. I
couldn't find any `empty?` function for core async channels, and since
`<!!` blocks if there's no message, I ended up putting a sentinel on the
channel and verifying that the next message read is the one.
(let [sentinel (keyword (gensym))]
(is (= sentinel (do (>!! channel sentinel)
(<!! channel)))))))
This appears to work fine, but how would I do it if it was not a test,
and I couldn't put random messages on the channel? Would I have to use
`alts!!` and a timeout?
Stig
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