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propensive's profile
Jon Pretty
Jon Pretty
Jon Pretty
@propensive

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Jon Pretty

@propensive

Supporting Scala through professional training and open-source software. Responsible for Magnolia, Fury, Scala World and Functional Africa.

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propensive.com
Joined July 2010

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    1. David R. MacIver‏ @DRMacIver 10 Jul 2015

      Twitter, lend me your thoughts: Why is it hard to write quality software?

      17 replies 3 retweets 4 likes
    2. David R. MacIver‏ @DRMacIver 10 Jul 2015
      Replying to @DRMacIver

      OK, follow up to attempts to reject the question: Why is it hard to ship bug-free software?

      5 replies 1 retweet 0 likes
    3. Jessica Joy Kerr‏ @jessitron 10 Jul 2015
      Replying to @DRMacIver

      @DRMacIver There is one happy path, and a million unhappy ones. We can test "it does x" but can we test "it doesn't do anything else"?

      2 replies 1 retweet 2 likes
    4. Kris Nuttycombe‏ @nuttycom 10 Jul 2015
      Replying to @jessitron

      @jessitron @DRMacIver this is why I like types and immutability. You can exclude a meaningful number of paths by construction.

      1 reply 1 retweet 2 likes
    5. Jessica Joy Kerr‏ @jessitron 10 Jul 2015
      Replying to @nuttycom

      @nuttycom @DRMacIver True. There's also event-driven style: if all your code can do is emit events, you can test that what wasn't emitted

      4 replies 0 retweets 0 likes
    6. Kris Nuttycombe‏ @nuttycom 10 Jul 2015
      Replying to @jessitron

      @jessitron @DRMacIver Can you elaborate? I'm not sure what such a test looks like from this description.

      3 replies 0 retweets 1 like
    7. Jessica Joy Kerr‏ @jessitron 10 Jul 2015
      Replying to @nuttycom

      @nuttycom @DRMacIver code is [Event] -> [Event], so one can assert "only these events were emitted"

      1 reply 0 retweets 0 likes
      Jon Pretty‏ @propensive 10 Jul 2015
      Replying to @jessitron

      @jessitron @nuttycom @DRMacIver Shouldn't we define what an "event" is to distinguish this from just any program? How is input constrained?

      11:16 AM - 10 Jul 2015
      0 replies 0 retweets 0 likes

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