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The Rubinius project generally uses TDD/BDD-style executable specifications to drive development. The Rubinius 'spec' directory is conceptually divided into two parts:
The specs at ./spec/ruby are a copy of RubySpec at a particular revision. These are regularly imported from the RubySpec project and failing specs are tagged so that the CI process always runs a known good set of specs. This enables easily confirming that changes to Rubinius code do not cause regressions.
Documentation about the organization of specs and guidelines for writing specs can be found at the RubySpec project.
Use the following workflow when adding specs and code to Rubinius:
rakecommand to ensure that all the CI specs pass.
The changes to files in ./spec/ruby are regularly pushed to the RubySpec project. Also, current changes to RubySpec from committers to other Ruby implementations are regularly updated in the ./spec/ruby directories. When the specs are updated from RubySpec, the CI tags are also updated.