[racket] Expect library?

Does Racket have a library/language similar to the Expect [1] tool? I need
a tool for testing input/output from other processes, including timing. I'm
considering rolling my own, but wanted to check that nothing else exists
yet.

I considered using Expect itself, but its timeout mechanism can only handle
an integer number of seconds (i.e. no fraction-of-a-second timeouts), and
I'd rather have all of Racket at my disposal when writing test scripts,
anyway.

[1] http://expect.sourceforge.net/
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