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+rspec is a meta-gem, which depends on the rspec-core, rspec-expectations and
+rspec-mocks gems. Each of these can be installed separately and loaded in
+isolation using require. Among other benefits, this allows you to use
+rspec-expectations, for example, in Test::Unit::TestCase if you happen to
+prefer that style.
+
+Conversely, if you like RSpec's approach to declaring example groups and
+examples (describe and it) but prefer Test::Unit assertions and mocha, rr or
+flexmock for mocking, you'll be able to do that without having to install or
+load the components of RSpec that you're not using.