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BDD and cucumber

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For more information: http://extremia.fi/ (in Finnish) or http://extremia.net/ (in English)

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BDD and cucumber

  1. 1. BDD and Cucumber (Part II) http://extremia.fi/ • http://extremia.net/
  2. 2. BDD and Cucumber• As time progresses and you create more cucumber features running all of them at once becomes impractical.• Some of the features deal with more static pieces of the system that don’t really change over time and could be ran only once a day (nightly builds).• Cucumber offers a few solutions for mitigating this problem. http://extremia.fi/ • http://extremia.net/
  3. 3. Using tags to filter test cases• An easy and fast way to reduce test runs for features that deal with pieces that are not actively being developed mark them with a common tag (such as @nightly) and running the cucumber features with, for example: cucumber --tags ~@nightly• You could just as well tag all your scenarios with some relevant tags and use cucumber --tags @TAG_1,@TAG_2… http://extremia.fi/ • http://extremia.net/
  4. 4. Using tags to filter test cases• The downside with this kind of tagging is a bit of a maintenance overhead, as the logical groupings of what you’re working on will inevitably change requiring the tags to change with them.• In a larger project with multiple developers or even teams the tags can also mix up making your scenarios more brittle and likely to run scenarios you didn’t intend resulting again in unnecessary testing overhead and a longer feedback loop. http://extremia.fi/ • http://extremia.net/
  5. 5. Filtering based on scenario name or line• Cucumber scenarios can also be filtered based on a single or multiple lines using line numbers by running cucumber features/some.feature --line 13 or cucumber features/some.feature:13• You could even filter by the scenario name but be careful as cucumber will match every scenario with the given text. So, for example, every scenario with email in its name would be run on cucumber --name email http://extremia.fi/ • http://extremia.net/
  6. 6. Splitting between RSpec and Cucumber• In addition to filtering test cases using Cucumber, a significant gain in test run time can be gained by running more fine grained tests using RSpec.• For example, to make sure a user is notified when some event has occurred in the system with relevant information you might be inclined to test each of the possible messages using cucumber. http://extremia.fi/ • http://extremia.net/
  7. 7. Splitting between RSpec and Cucumber• Assuming that each of the messages is shown to the user using the same programming logic our integration tests (cucumber) could simply check for one of these messages, leaving the quicker unit tests to worry about the rest of the notifications.• Doing so could result in significant gains in test- to-feedback-loop thus making sure the tests are actually run more often. http://extremia.fi/ • http://extremia.net/

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