We are using Spring in our tests for sequential test execution but not for parallel test execution. And Rails requires you to set the config.cache_classes = false if you are using Spring in tests.

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With our setup, this would raise the following error in cucumber-rails Show archive.org snapshot for parallel test executions due to some legacy database cleaner issue.

WARNING: You have set Rails' config.cache_classes to false
    (Spring needs cache_classes set to false). This is known to cause problems
    with database transactions. Set config.cache_classes to true if you want to use transactions.

Fix

You need to upgrade to cucumber-rails >= 2.1.0 and adjust the config.cache_classes in config/environments/test.rb like below:

config.cache_classes = !defined?(Spring)