new post on cucumber rerun

_includes/tag_cloud.html

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_posts/2015-05-13-cucumber-rerun-formatter.markdown

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+---
+layout: post
+title: Rerun failing tests with Cucumber - a solution for nondeterministic UI tests?
+author: Matt Robbins
+categories:
+- testing
+- cucumber
+- selenium
+---
+
+The evolution of acceptance test automation, or at least my experience of it has been something like this:
+
+_2005 - 2008_ : QA runs automated test on their machine pior to raising deployment ticket
+
+_2009 - 2012_ : CI runs automated tests - downstream, everybody ignores them
+
+_2012 - present_ : Continuous Delivery...UI tests broken, no deployments...now we have your attention!
+
+So hopefully you have arrived at stage 3 and have done the following to ensure your UI tests are as resilient as possible:
+
+* Followed Martin Fowler's [test pyramid](http://martinfowler.com/bliki/TestPyramid.html) and not implemented every conceivable system test via Selenium
+* Implemented sane retry logic to find UI elements
+* Isolated your UI using stub backends to guard against unexpected data
+* Added spoonfuls of helpful debug logging to highlight issues
+
+But your tests still appear now and again be nondeterministic and people are getting frustrated.
+
+This can happen, UI testing is hard and no matter how much you defend against it peculiarities of the runtime environment can conspire against you.
+
+In this instance it might be handy to have 'one more go' when you get some failures and Cucumber's rerun formatter allows this.
+
+The Example
+-----------
+
+[This](https://github.com/mcrmfc/cucumber-rerun-example) is about the simplest example I could come up with.
+
+The test will fail 50% of the time, allowing you to see the rerun kicking in on selected runs.
+
+You can run the test using `bundle exec rake`
+
+The test should be run for a second time if it fails and should terminate with an appropriate exit code.
+
+You can see some examples of this working in the project's [Travis](https://travis-ci.org/mcrmfc/cucumber-rerun-example/builds) build.
+
+Other Thoughts
+----------------
+
+Another useful thing might be to run any failing tests from previous CI runs first and you could probably adapt this approach to do just that!
+
+Credit
+------
+
+I just thought I would illustrate with an example what others have already highlighted:
+
+<http://blog.mattheworiordan.com/post/42587188567/automatically-retrying-failing-non-deterministic>
+
+<http://blog.crowdint.com/2011/08/22/auto-retry-failed-cucumber-tests.html>
+