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Factorial example

Acceptance tests for factorial:

0! is 1

send::  msg sample.factorial  (n:Number=0)

expect::  (payload == 1)

1! is 1

send::  msg sample.factorial  (n:Number=1)

expect::  (payload == 1)

5! is 120

send::  msg sample.factorial  (n:Number=5)

expect::  (payload == 120)

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