Make Arbitrary StreamingT more arbitrary#649
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This still isn't a perfect Arbitrary instance for StreamingT, but I think it will help us hit more test cases than the current implementation. For example, I don't think the current instance ever results in `Wait` instances.
Current coverage is
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👍 Another improvement I could imagine is using weights to try to help ensure that we have longer streams (since right now there is a 1/3 chance of being empty at each step). But let's merge this first. |
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stew
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Nov 15, 2015
Make Arbitrary StreamingT more arbitrary
ceedubs
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in ceedubs/cats
Nov 16, 2015
This commit does two things. 1) Use a frequency distribution in the `StreamingT` generator as suggested by @non [here](https://github.com/non/cats/pull/649#issuecomment-156856211). It is now twice as likely to generate a Wait as an Empty and 6 times as likely to generate a Cons as an Empty. 2) Update the `Streaming` generator to be similar to the `StreamingT` generator (use a frequency distribution generator of Empty, Wait, and Cons).
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This still isn't a perfect Arbitrary instance for StreamingT, but I
think it will help us hit more test cases than the current
implementation. For example, I don't think the current instance ever
results in
Waitinstances.@non could you please be one of the reviewers of this?